Ffmpeg pts to seconds. mp4: output file name pattern.

Ffmpeg pts to seconds Here's something to get you started. node v3 = joined[0] a3 = joined[1] ( ffmpeg . jpg I tried again with the new -frame_pts option : ffmpeg -i source -f image2 -r 1/5 -frame_pts 1 %d. If the FFMPEG can't be adjusted, I'm ok with doing it externally, but Looking through the documentation for drawtext, doing some tests, and Googling around, it seems like localtime and gmtime don't provide milliseconds -- just seconds. e. 5 -f null - OutPut I have a class (it uses ffmpeg) in my java application that takes a path to a video file, then gets a new video from the source file. NOTE: the command was updated based on comment from Oben Sonne. jpg 15. You can see the units by passing to ffprobe the '-unit' option: ffprobe -i i. html#Text-expansion. 2. ffmpeg -y -i input. mp4" -c copy -map 0 -segment_time 00:00:01 -f segment -reset_timestamps 1 output%03d. mp4 -c copy -video_track_timescale 600 full600. ff, by which I mean we always keep only the last two digits of the seconds, and we ONLY print two significant digits of the fractional (micro/milli) second portion. jpg 3. the initial dts/pts was shifted a I'm using ffmpeg with silence detect filter but I'm unable to understand why its not giving silence duration with this file while it gives result with other files. The latter takes about 16 times longer on my computer, but in the end it only takes about 1. Make sure you download a recent version of ffmpeg, and don't use the one that comes with your distribution (e. Code; Issues 37; Pull requests 5; Actions; Projects 0; Security; you have packets and frames sorted by increasing pts, not as they are arranged in the stream. org/ffmpeg-filters. sh Use chmod +x video-cutter. mp4 -force_key_frames 00:00:03. It was set to 5 seconds, which yielded 3 seconds worth of black frames at the beginning of the video (5 - 2 = 3). 100. ms. Not really sure why this is off by multiple seconds, but I suspect it has something to do with the input clip itself ( which is only 2 I've got a hunk of 15 seconds of straight-from-the-camera. output( v3, a3, 'out. How to use this timebase to convert PTS. mp4 -show_frames -unit . mp3 offset_test. Too see the gif-overlay in action check out Glitterly - a web based video editor I've been working on. mkv (2) You need to set a constant bitrate (CBR) on the audio settings, then from each video you convert the audio into PCM (to get an array of the audio wave's amplitudes) and look for the values that represent your pulse Then calculate msec_time_of_Pulse as = (audio_sampling_rate / 1000) * Num_audiosamples_until_Pulse to get media time of pulse This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented. The time I've received the first packet could be 30 seconds delayed from when the frame was taken for my application, and 10 seconds delayed for another application. Did I need to set the ptsValue to AVFrame? then FFMPeg can control the display time itself. num / stream->time_base. here is the code in the video thread: PTS stands for Presentation TimeStamps. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community I need to extract frames in certain interval of the video, (eg from 40 sec to 50 sec). So, a timebase of 1/75 represents 1/75th of a second. Fixed by chaining setpts=PTS-STARTPTS filter after the trim filter. Note that PTS and DTS are not equivalent. Our purpose is to mux two streams (video and audio) into M3U8 playlist using HLS. This filter accepts the following options: I have an input MPEG-2 TS file and I prefer to use some open source tool like ffmpeg or something similar. eof_action=pass allows the output to go to out rather than displaying the clips end frame for the rest of the output video. Some players do not properly respect this and will display black video or garbage. The MPEG2 transport stream clocks (PCR, PTS, DTS) all have units of 1/90000 second. Video sync takes effect only once the frame has exited the decoder(+filtergraph) pipeline. ffmpeg -i a. The setpts filter evaluates the expression and assigns the value as the timestamp for the current frame it is processing Stack Exchange Network. And of course, ffmpeg allows us to redefine what that allocation function is. It is lightning fast. That said, a better solution that does not involve generating individual clips and concatenating them would be to use Most modern video codecs are using I/P/B frames which brings the decoding time stamp (DTS) and presentation time stamp (PTS). Commented Jul 13, 2021 at 6:35 Run. This is the command I am using: ffmpeg I want to convert the dts values into 'double seconds' but if I try using the timebase converters (presumably incorrectly) I get crazy numbers. If it gets to a certain point then I want to seek to a later point in the video. In each stream, there is the timebase info, for example, "15360 tbn" in the first email, which means the PTS is measured in 1/15360 sec. mp4 -vf 'select=between(pts\,<pts_from>\,<pts_to>)' transcoded_cunk. mp4 -filter_complex \ "[0:v]trim=60:65,setpts=PTS-STARTPTS[v0]; \ [0:a]atrim=60:65,asetpts=PTS Slightly different from the last two commands, setpts=PTS-STARTPTS is added to the command to adjust the timestamps of the output video. Visit Stack Exchange I'm trying to extract x seconds from every minute and produce a video. – Gyan. But this would involve more than one command: ffmpeg -i input. if a stream has 24 frames per second, a PTS of 42 is going to indicate that the frame should go where the 42nd frame would be if there we had a Using the FFMpeg library in my Android app, I try to understand how I can seek in an audio file, at a very precise position. 25*PTS" seeing. In case of infinity, the returned value is expressed as {1, 0} or {-1, 0} depending on the sign. wmv -ss 60 -t 60 -acodec copy -vcodec copy output. Modified 11 months ago. mp4 For example, whenever I attempt to scale the duration of this tiny 67ms clip to 7 seconds: ffmpeg -i input. org> wrote: > Did I understand you correctly that I need to multiply time_base and > system time between adjacent frames and add the resulting time to the > previous PTS? > > Nope. 7167 by 60 to get the remaining seconds. It correctly removes the initial specified seconds specified with -ss but then keeps going to the end of the input with the copy. mp4 -ss 00:00:03 -to 00:00:09 -c:v copy -c:a copy part1. mp3 For aevalsrc filter, aevalsrc=exprs=0:d=5[silence]. org metrics for this test profile configuration based on 251 public results since 11 November 2023 with the latest data as of 5 April 2024. mp3 testAsInput. Is there a way to use ffmpeg to slow down or speed up a video based off a number I give to it? factor is less than 1. How do I drawtext video playtime (“elapsed time”) on a video, with FFmpeg's --filter_complex option?. This resets the timestamps of the output video to start from To drop frist 5 seconds, I can use ffmpeg -i input. 5; Fast (2x): setpts=PTS/2 or setpts=PTS*0. txt -c copy final_output. In C, removing the markers would work like this: ffmpeg -i test. The advisable way to do this is using the option -output_ts_offset N where N is in seconds. 1 seconds long and a Windows computer with ffmpeg. 7167 and then multiply the fractional part . Mysteriously the input. ts -vf "select=gte(n\, [FRAME_INDEX])" -show_entries frame=pkt_pts_time -v quiet -of csv="p=0" -stats -y output. – Combining the scene filter (for detecting scene changes) and the showinfo filter should achieve what you want:. 4)',showinfo" \ -f null \ - 2> ffout This command extracts all frames that differ from the previous frame by more than (gt) 0. The overall start_time of the program is calculated by the using the presentation time stamp(PTS) of each individual stream in the file. The timing information will be in AVStream. mkv', ffmpeg -vsync 0 -i video. mp4 You can repeat the process for the second part. ffmpeg -skip_frame nokey -i file -vsync 0 -frame_pts true out%d. 6k次，点赞3次，收藏14次。本文详细介绍了FFmpeg中PTS(time stamp)的计算方法及转换流程，包括有输入流地址和无输入流地址两种情况下的具体实现步骤。重点讨论了自变量frame_index的使用、时基转换函数av_rescale_q的应用以及延时处理等关键技术点。 I am trying to mark a timestamp in a video using drawtext filter. It no longer repeats the first frame. Here is the command I use to slowdown frame 1 and speed up frame 2: ffmpeg -i input. I am using ffmpeg to cut out a section of a large file like this: ffmpeg -i input. Second one is used to transcode video chunk applying select filter for exact frames match. 189063s You can ignore C2 and just divide C1 by 90000 to get a less precise timestamp. How to cut a video, without re Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company ffmpeg -i in -vf "setpts=(PTS-STARTPTS)/20" -r 20 out Without the fps filter or -r option, ffmpeg will assume the framerate of the output stream is still 1 fps and so will drop 19 out of each 20 retimed frames. printf("pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n", /* timebase: This is the fundamental unit of time (in seconds) in terms * of which frame timestamps are represented. mp4 -r 24 seeing. pts_time is the equivalent for pkt_pts_time. ffmpeg -y -i seeing_noaudio. png -vcodec mpeg4 demo. 5 hours of FHD stream (conjunction with -c copy To cut a piece from say the third second to ninth second: ffmpeg -i input. It's relative presentation time depends on the start_time of the file, for which use -show_entries ffmpeg -y -f lavfi -i testsrc=size=192x108:rate=100:duration=0. y. mp3 where X is the duration in seconds of leading content to be trimmed. I know that it is possible to use ffmpeg to speed up an entire video with a command like ()ffmpeg -i input. And then my timing is 20 seconds off. For fixed-fps content, Generated on Sun Feb 16 2014 19:20:51 for FFmpeg by How do I select the audio corresponding to a set of filter-selected videoframes? E. Professional video editor here who isn't skilled at FFmpeg, so bear with me. mkv. For example: from a 6 minute video, I want to take the 1st second from the 1st minute, then the 1st second from the 2nd minut Skip to main content. For these frames, information is printed out (showinfo) like this The PTS has to be modified so that each new clip starts 1 second before the current combination of clips ends i. . If it is from 10th second to 16th second: ffmpeg -i input. Save it to a file with a name and . setpts ('PTS-STARTPTS') basically resets the timestamp to 0 after a trim filter has been passed. limit the duration of data read from the input file. Parameters The PTS of the first frame. mp4 -vf trim=5:10,setpts=PTS-STARTPTS output. txt -c copy final. -r 1000 - set the framerate to the output to 1000Hz, for converting the index to milliseconds. (2) From the second 5 to second 11 the audio is played, from second 3 to 16 the video will be played at the same time. AV_NOPTS_VALUE for pts/dts, 0 for duration) if the stream does not provide them. mov -f image2 -vf fps=fps=1/2 thumb%04d. 00 1 0. Share. , 841 end_pts-seg That's because, for a time span of 10 seconds and a frame rate of 60fps, there should be 600 frames, but the computer is too slow and is only capable of recording 300 frames, so the frame that should appear on t = x ends up appearing at t = x/2, because I'm calculating the PTS according to the number of frames, not the time elapsed from start. My example stands for any video duration and returns 2 digits for ffmpeg -f concat -safe 0 -i files. Based on OpenBenchmarking. ISO_IEC_14496-12 There are two types of "Box" related to calculating "pts_time":ctts and stts. txt frame_pts option is your friend set it to true and ffmpeg will output the frame's presentation timestamp as your filename. always increasing, so if frame 20 has original pts 20 seconds, and frame 21 has 21 seconds, then with your expr, frame 20 will have new pts 40 and frame 21 will have new pts 10. org data, the selected test / test configuration (FFmpeg 7. But how to drop the last 5 seconds? ffmpeg; video-editing; Using -ss & -to will also eliminate any need to adjust the PTS's. mp4 Also, see this thread for more details. Simple examples: Slow (half speed): setpts=PTS*2 or setpts=PTS/0. 1 Encoder: libx264 - Scenario: Live. Improve this AVPacket. Let us find the answer from the MP4 specification i. Or I have tried . mp3 Use. This has outpoints at 4 (seconds). mp4 Have to do one bookkeeping step for the full video. png Credits goes to this superuser answer . . i'm using this command: ffmpeg -i "video. Of course, even then, we might not get a proper pts. mkv -filter_complex It seems the milliseconds traverse 0-999 and the remaining are all time (60 seconds) rollover based. And I'm trying to use FFmpeg to extract the timestamp (PTS) from the specific frame index. v "setpts=0. den))); There is a way, you need to add a second step. This filter also supports Missing couple of seconds at the begining of 2-nd and following segments (up to 15 seconds with big segment_time (30 minutes ~ 300MB)) from rtsp. d means the duration in seconds. mp4 And it successfully trims the video. These montages again are used to show a Accurately extract frames every N seconds using FFmpeg. -i "rtsp://murl>": specifies the input source. And also got the timestamp for each snapshot that will be taken. The command is ffmpeg -f image2 -i screenshot_%5d. So we'll make a new function that saves the pts of the packet. 'T' the time in seconds of the current frame 'POS' original position in the file of the frame, or undefined if undefined for the current frame 'PREV_INPTS' The previous input PTS. I tweaked the command you supplied to this: ffmpeg -f concat -safe 0 -segment_time_metadata 1 -i ~/glass-videos. Or I need to control the display by my own code? I am using mjpeg files and so the pts seems to be retrieved every single time a frame is decoded, I have multiplied the pts by the time_base as dranger does to get the value in seconds but the resolution seems to be only seconds and so I get the value "6" 25 times and then "7" 25 times as the video runs at 25 frames per second. When I decode the video frame by frame the pkt_pts of each successive frame should increase in time base units. &packet); long position = (long) (1000000 * (packet. mkv theres this glitch thingy, the audio is intact but the video frames get all jumbled for like 10 seconds. However, the video length is shorter than what I want, and it moves very fast. -f segment: This tells ffmpeg to use the segment muxer, which divides the output into multiple files. 5; 10x speed increase for video ffmpeg -i input. I started by trying to do what I'll call a "copy extraction": to get seconds 9 to 12, ffmpeg -i test. 5 seconds %d. mp4 Which changes the duration but not the framerate. Clearly the frames are separated by 1500 - but I try to set pts for each frame of the input video. I have tried the following command ( I have replaced the [FRAME_INDEX] with 5), but it was nothing happend: ffmpeg -i 0. ffmpeg -i input. 43. I used the knowledge here to create a shell script. This example trims from 1 minute to 1 minute and 30 seconds: ffmpeg -ss 00:01:00 -i example. ogg Frame pts_time 0 0. mkv # removing -vsync drop results in an identical output file To trim a segment from a video, we use the following command. 000000 select_out:0 and the n is the frame index. video a1 = intro. 83 seconds like 01:23, use this We can cut a video with FFmpeg with no re-encoding with: ffmpeg -ss 120 -t 60 -i input. mp4 Each of these four sections specifies: start time (seconds), end time (seconds), and the mysterious setpts=PTS-STARTPTS filter, which essentially makes each video subclip start at 0 seconds. ffmpeg -t 5-i input. First of all, cutting a video with ffmpeg -i [input_video] -ss [seconds_to_start_cut] is quite slow. concat[output] combines all segments into First one is used to seek and copy video chunk. audio v2 = mainvid. 5 is the number of frames per seconds (was fps=5 above) 43 is the number of seconds to subtract (from the start time -ss 43) 2 means a two-digit output, so 00 instead of 0; Formatting as mm:ss. jpg 2. mp4 -vf trim=start=5,setpts=PTS-STARTPTS output. mp4. After ffmpeg decodes to an approximate position pkt_duration_time is in seconds. mp4 (I'm doing this on windows but normally would be on linux). I currently have a loop running through the frames of a video using av_read_frame() and I want to determine what time this frame should be at in seconds. E:\video\tmp>ffmpeg -i a. mp4 -af "asetpts=PTS+3/TB" output. Previous message: [FFmpeg-user] dshow: Multi channel Video Capture Cards for FFmpeg Next message: [FFmpeg-user] How is the gmtime option used for pts? Messages sorted by: On Mon, Jan 2, 2023 at 4:51 PM wolverin via Libav-user < libav-user at ffmpeg. /ffmpeg -itsoffset 100 -i 3. mp4 In libimxvpuapi encoded_frame->pts just copies raw_frame->pts, so I guess the raw_frame->pts needs to be calculated by the application. Whereas the absolute time That does not do what you intend. [silence] is your output label. When I usd your command and 1 second outpoint, I get a single frame held for the full second. I've since changed my keyframe interval However, the result of this is that BOTH videos freeze the first frame for the delayed duration (of 2 seconds in this case). it creates the files but many of the output files are longer than 1 second duration. pts * ((float) stream->time_base. 04 input. ffmpeg sets a default Mux decode delay value of 0. duration timing information will be set if known. 7 seconds. The question is (actually I have two questions): I assume the location and duration of silences are known to you before ffmpeg execution. Viewed 7k times 6 -t duration (input/output). As @theSHEEP pointed ffmpeg waits for I frame to arrive before making a cut. You can also try achieving 3 seconds segments (approximately) duration by modifying ffmpeg. By default this test profile is set to run at least 3 times but may increase if the standard deviation exceeds pre-defined defaults or other calculations deem additional runs necessary Isn't there a way to tell ffmpeg to make the output video to start with a key frame? e. 4 (on a scale from 0 to 1). 3 second in total, which obviously defeats the “millisecond-accuracy” goal. setpts works on video frames, asetpts on audio frames. But the problem is that the duration of the video output is not reduced based on the speed we provide. mp4 Next, create a text file. When used as an input option (before -i), . 12 For the sake of precise resolution of these time values, a timebase is used i. 000 -filter_complex To get minutes, you have to divide 2383 seconds by 60. 0, it will slow down the video. The video indeed does end at 5 seconds, but in all media players it's shown as if its 8 seconds long. jpg-vsync 0 - Each frame is passed with its timestamp from the demuxer to the muxer. audio or input. wav" -af silencedetect=noise=-30dB:d=0. 000000 key:0 interlace_type:P pict_type:P scene:nan -> select:1. 506 seconds. Also, the "PTS" is an internal variable, so it can be The fields you'll need to know are PTS, which is the presentation timestamp before the filter is run; STARTPTS, which is the presentation timestamp of the first frame rendered, and TB, which stands for Time Base and is basically the ratio between a PTS "tick" and a second; so if you know that your first clip is going to be five seconds long ffmpeg -i fullvideo. 0 - Encoder: libx265 - Scenario: Video On Demand) has an average run-time of 10 minutes. This will still be accurate. I think I know the answer. exe. I try to use select, I try to use select, PTS stands for Presentation TimeStamps. 0, it will speed up the video, if it is greater than 1. pts_time=6. mp4 -filter:v "setpts=1. The difference is the frame count for Use the scale filter with animation, available since v4. pkt_pts=14014 pkt_pts_time=0. mov video out of which I want to extract a specific chunk, which I can identify by start time and stop time, in seconds. – If the container allows it, you can start at non-zero PTS. 08 3 0. 5 second output for 60 seconds of video # output is only the first few frames of source, still at 30fps # ffprobe also shows 30fps for the output file ffmpeg -vsync drop -fflags +genpts -i ffv1video. – JayCravens. Here's an example of my main loop I have a video with variable framerate that I decode into single frames using -vsync passthrough to avoid duplicate/lost frames. Check the frame index for each successive t. The description of -vsync 0 isn't accurate and was written 8+ years ago: Each frame is passed with its timestamp from the demuxer to the muxer. at the moment I am sampling 1 in every 100 frames of a video (running at 15fps) using the FFMpeg select filter. ffmpeg -y -i footage60fps -filter_complex " [0:v]trim=start_frame=28:end_frame=82,setpts=PTS-STARTPTS,framestep=2[v0]; [0:v]trim=start_frame=10:end_frame=20 How can I cut a video to a certain length and add an intro video to it using ffmpeg-python? I am doing this: intro = ffmpeg. Execute the command with the setpts filter: ffmpeg -y -i input. %d is a placeholder that will be replaced by a number, starting from 0. And, it starts the output PTS at a value corresponding to 10 seconds, instead of zero. mp4 -ss <start_time> -to <end_time> -c copy segmentN. How can I check keyframe interval of a video file? all I can see in ffmpeg output is: Metadata: metadatacreator : Yet Another Metadata Injector for FLV - Version 1. If the video is 30 seconds long, the output file is Here's what I use and will only take a few seconds to run: ffmpeg -i input. But how to drop the last 5 seconds? ffmpeg; video-editing; Share. They may also be unset (i. 2 120. Or compile it yourself. ffprobe will return 6 digits for microseconds if -sexagesimal option is present. mp3 The -acodec switch tells ffmpeg to use the special "copy" codec which does not transcode. ogg -ss '100ms' -t '600ms' -c copy x2. I want to eliminate the milliseconds portion. It also chops a video in a few 3 second long pieces, and joins them together. I am extracting 1 frame per second using the following command: I shift the audio pts by using: ffmpeg -y -i input. Input Command: ffmpeg -i "input. This is set in the ffmpeg_opt. OpenBenchmarking. 5 seconds in duration. flv. ; Elapsed 2 seconds since the video started: the video displays 00:02 / 02:30. mkv -map 0:v -c copy ffv1fastvideo. You and can not track it this way because the next PTS may be a lower time stamp. Using as an example, 2 seconds silence at 3rd second 3 seconds silence at 6th second 1 second silence at 10th second We are using FFmpeg libraries git-ee94362 libavformat v55. My question is how to control the display time by ptsValue which provided by library. How to add offset to audio file with ffmpeg? Or simply use ffmpeg -ss X -i 3. You just need to make sure the value of -read_intervals, in seconds, is PTS have to be monotonic i. I was expecting 0, 2, 4, 6, seconds; I'm not sure why there's an initial one second gap between thumbnails before it settles into making them every two seconds. For audio use the atempo, rubberband, or asetrate audio ffmpeg -f concat -i ffmpeg-sound. FFmpeg shows the timescale as the tbn value in the readout of a stream. 5*PTS" output. dts and AVPacket. To display minutes and seconds, or if the duration of the video is greater than 60 seconds and you want to display e. Thanks for sharing this version of FFmpeg's solution, I'd prefer to use FFmpeg over avconv. jpg 5. c. mp4 ffmpeg -i input. the first 10 seconds of video - FADE IN (from 0% to 90%); the last I reached a part where I can cut the video with ffmpeg -i test. -segment_time 5: duration of each segment. This is due to ffmpeg's behavior, as has been discussed in detail in #26, #208 and shown in this example. i'm trying to create 1 second video files from the original using ffmpeg. Examples Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use. the 3rd clip should start fading in at 8 seconds, since the combination of the first two clips is 9 seconds (4 seconds of first clip + 1 second transition + 4 seconds of 2nd clip). 5 seconds to search through 1. -frame_pts 1 - (However, ffmpeg may suppress those repeated frames, depending on the -vsync setting. ffmpeg. 233567 s pkt_duration=2002 pkt_duration_time=0. mkv -filter:v "setpts=0. Commented Mar 22, 2020 at 5: Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company For setpts=PTS-STARTPTS+1/TB: ** +1 is the time in seconds we want to delay our offset ** TB is the timebase. 3. ffmpeg -i fullvideo. Under macOS, you can use Homebrew and brew install ffmpeg. mp4 | tail -1 This will print values in the form of 118231200|3600 where the first value is the pts and the second the duration of the last packet of the video stream. You can stream copy particular video segments using -ss and to into how many ever streams you want. That's not valid and ffmpeg will adjust the pts of 21 to be larger than frame 20. Next PTS: PTS is not monotonic and can go backwards in time. Packaged versions from various distributions are often outdated and do not behave as expected. The problem is that when I am using -vf showinfo option it shows me a restamped PTS. Commented Dec 11, 2015 at 8:04. it has to be multiplied by the timebase to convert them to seconds. My idea is to input the frames plus the original video and use the timecodes Here's a command line that will slice to 30 seconds without transcoding: ffmpeg -t 30 -i inputfile. Decoding: pts of the first frame of the stream in presentation order, in stream time base. pts, AVPacket. 'PREV_INT' Install ffmpeg. This is great, but I ultimately need to format this in the format SS. 000000 pts:138240. 1k. mp4 -ss 01:19:27 -to 02:18:51 -c:v copy -c:a copy output. I've tried to use ffmpeg to take snapshot with following commands. the video i got was displayed as 8 seconds long even though i specified that the video lasts for 5 seconds. First off, Use int64_t pts = av_frame_get_best_effort_timestamp(pFrame) to get the pts. ffmpeg -threads 1 -i 480P_600K_71149981. 002 So it's 39 minutes, 43 seconds. mp4 -filter_complex "setpts=PTS/10" output. I dump one down-scaled image every 10 seconds, inclusive, that I combine into montages with imagemagick. mp4 But now, I only want to adjust the first of n audio frames (or 0 ~ n seconds). 000000 t:9. jpg 10. – jiggunjer. 506000 means an absolute presentation timestamp of 6. A player should decode but not display packets with negative PTS, and the video should start accurately. paste the content above on the file an save it I've got a video with the length of 200 minutes. After processing those frames with another application I want to encode them again into an mp4 video that has the exact same timestamps as the original video. mp4 -ss 00:00:10 -to 00:00:16 -c:v copy -c:a copy part2. I am using ffmpeg for this purpose. mov Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Turns out this command will trim the video from 2 seconds on, as expected: ffmpeg -i input. Since the video lasts less than the audio, a 2 second pause should be inserted after the 3rd second of video (to match the 5 second video's length). Using following code, I'm able to trim video by time: ffmpeg -i input. Working in c++. 067)*PTS" -an output. mp3 -acodec copy outputfile. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. So, hour have only one digit for hours, not two. 0 - Encoder: libx264 - Scenario: Video On Demand) has an average run-time of 12 minutes. com Thu Feb 4 00:00:24 CET 2016. sh extension such as video-cutter. mp4 -vf trim=0:3,geq=0:128:128 -af atrim=0:3,volume=0 -video_track_timescale 600 3sec. There is not much documentation, but I think that in newer versions of FFmpeg AVFrame::pkt_pts was declared deprecated, so ffprobe doesn't show 'pkt_pts_time' entries. Fortunately, FFMpeg supplies us with a "best effort" timestamp, which you can get via, av_frame_get_best_effort_timestamp() For example, if a stream has 24 frames per second, a PTS of 42 is going to indicate that the frame should go where the 42nd frame would be if there we had a frame every 1/24 of a second (certainly not necessarily true I am trying to speed up video using python. images, but i want to preserve the video's The code by @gyan didn't work out for me, I found another (longer) way to do it: I extracted the audio file from the video first using: ffmpeg -i input. exprs specifies the output value. input(mainvid) v1 = intro. Some of the MP4s jump in correct successive pts values. end=10,setpts=PTS-STARTPTS [cut]' -map [cut] output. I have MP4 that were encoded with different GOP & bitrate values. The application appears to be giving you an accurate value. Below is an overview of the generalized performance for components where there is sufficient statistically significant data based upon user-uploaded results. mp4 trim=start=120,setpts=PTS-STARTPTS[v4] trims from 120 seconds to the end of the video. The pattern is always (from most to least significant bit) 3 bits, marker, 15 bits, marker, 15 bits, marker. If possible, use always format2 (-ss '120534ms'). Example. Thanks in advance 文章浏览阅读2. Here is the wording from the spec describing the ctts. The problem I'm having is calculating this value! For the most part the video player works and audio seems to be completely fine. wav -filter_complex "aevalsrc=exprs=0:d=5[silence], [0:a] [silence] [1:a] concat=n=3:v=0:a=1[outa]" -map "[outa]" out. more explanation of mixing framerate Based on OpenBenchmarking. The easiest way to do this is convert everything to AV_TIME_BASE_Q. 233567 s pkt_dts=14014 pkt_dts_time=0. To solve this you need to convert PTS to CTS, and then back: auto cts = packet->pts - packet->dts packet->dts = // Whatever you are updating the dts to packet->pts = packet->dts + cts So when specifying a video-filter to display current video-time in 'hms' layout, the filter appends a millisecond value after the seconds-field. video a2 = mainvid. I have a large batch of videos, all different lengths, and I would like to trim them by 10 seconds at the beginning AND 10 seconds at the end. mkv -filter_complex "drawtext=fontfile=/Library/Fonts/Arial. concat(v1, a1, v2, a2, v=1, a=1). The PTS and DTS have three marker bits which you need to skip over. If not done, the combined video will likely run at the wrong speed. stop writing the output after its duration reaches duration. mp4: output file name pattern. The setpts filter evaluates the expression and assigns the value as the timestamp for the current frame it is processing leandromoreira / ffmpeg-libav-tutorial Public. flv \ -filter:v "select='gt(scene,0. Likewise, you can combine multiple files into one stream - both video and audio. This will be vital when re-compositing them. If you have a very big clip, but you only need a few minutes or seconds, ffmpeg can cut out the necessary pieces. or if there is any other things to follow. but i've got the same warning in both cases and in the final video, as it switches from the end of 1. Put simply, ctts is "base" and stts is the offset, we can derive the "pts_time" by adding "offset" from "base". To have 2 digits you can excute: ffprobe -i <file> -show_entries format=duration -v quiet -of csv="p=0" | rev | cut -c 5- | rev, due to the fact that real format of duration is h:mm:ss. mah at gmail. g. Second you must make sure both streams you are syncing use the same time base. Here is how: ffmpeg -ss <sec_from> -to <sec_to> -copyts -i <input> -map 0:v:0 -c copy chunk. FFmpeg 6. mp3 Will stop writing automatically after 5 seconds; When used as an output option (before an output url), . FFmpeg easily marks timestamps based on localtime, gmtime or even PTS. That converts the framerate but drops frames so the total duration is unaltered. ) If you set start_time to 10 seconds, then fps sets the sync point to the PTSs converted from 10 seconds on the timeline. Generated on Sun Jan 12 2025 19:23:37 for FFmpeg by . flv -ss 2 -vcodec copy -acodec copy output. 5. To preserve it, add -copyts. This uses more CPU resources and therefore takes longer, but the cut is now precise. However, I want to assign a reference time (start time) for FFmpeg will, by default, remove the starting offset. mp4 But if I try to specify start and end time using HH:MM:SS format, FFmpeg returns an error: To drop frist 5 seconds, I can use ffmpeg -i input. mp4 10x speed increase for both audio and video. As someone else wrote in the other thread: timestamp = PTS * timebase. mp3 But it doesn't work. 04 2 0. By default this test profile is set to run at least 3 times but may increase if the standard deviation exceeds pre-defined defaults or other calculations deem additional runs necessary For example, when joining a longer file (about 4 minutes with 31 parts in total), I found that the duration of the file had increased by about 0. input(intro) mainvid = ffmpeg. Each of the images in the display has a value describing the number of seconds along the timeline when the frame is to be displayed (PTS). I use FFMpeg to decode video data correctly. mp4 -filter_complex '[0:v] trim=start=5:end=10,setpts=PTS-STARTPTS [cut]' -map [cut] output. mp4 -ss <start_time> -to <end_time> -c copy segment1. Ubuntu). Changing the timestamps prior to encoding is risky since ffmpeg's framerate conversion method uses timestamps to check sync drift and make decisions about dropping or duplicating frames. ; Elapsed 3 seconds since I shift the audio pts by using: ffmpeg -y -i input. mp4 (This question's answer suggests to also use -avoid_negative_ts make_zero but it does not explain why)Unfortunately, the result is often choppy or non-smooth in the first seconds, as detailed here (closed because off-topic), because the cut point doesn't [FFmpeg-user] How is the gmtime option used for pts? Matthew Mah matthew. If used as an output option, ffmpeg first decodes the complete stream up to the position. mp4 -vf "drawtext=text='%{pts \: hms}':fontsize=20:fontcolor=white: box=1: boxcolor=black" Note that when using -ss before -i, FFmpeg will locate the keyframe previous to the seek point, then assign negative PTS values to all following packets up until it reaches the seek point. a unit of time which represents one tick of a clock, as it were. The markers must be equal to 1. mov -vcodec copy -acodec copy -ss 9 -to 12 test-copy. So far I have extracted the PTS values using FFMPEG and I have a list for each frame which PTS it has. Can anyone help me to understand the out given below that why its not showing detected silences. Since the filter adds an offset of 3s to the first ten packets, it is reasonably expected that the earliest PTS will be 3 seconds. e. 25*PTS" output. mkv -r 1000 -f image2 -frame_pts 1 %d. In this case, it’s an RTSP stream from an IP camera. See What is video timescale, timebase, or timestamp in ffmpeg?. First I am getting position where I need to start reading static double t = 10 ;//time in sec There could be multiple applications that all use this stream, and I would like my program to be synced with those. ffmpeg -y -r 30 -i seeing_noaudio. mp3 -c copy trimmed. So, what hello_world does with ffmpeg's lib is the following:-Demuxing (av_read_frame) I have a series of screenshots from a demo that I want to put in a video. ttf: text='timestamp: %{pts \: hms}': Change the PTS (presentation timestamp) of the input frames. mp4 now what command should i pass so i can add this effect as iam not good at ffmgep. I'm constantly posting more FFmpeg tips and tricks on Twitter (and happy to answer any questions!) - @AhlrothOskar. Ask Question Asked 2 years, 6 months ago. mp4 -vn -ab 128 audio. jpg ffmpeg add text every second with enable between filter 0 FFmpeg to create a custom time stamp with suffix (mins, hrs, days) and user defined time between frames I am attempting to extract frames with their timestamps from videos using the command line, but I am struggling to relate both the output of the showinfo filter to the actual frames outputted by the command, and the corresponding output file names from the -frame_pts option. avi the resulting video is only 3. I have tried a bunch of alternative options, including. 8 hasKeyframes : true hasVideo : true hasAudio : true hasMetadata : true canSeekToEnd : true datasize : 256600272 videosize : 210054362 audiosize : 45214634 lasttimestamp : 5347 "[0]trim=end=1,setpts=PTS-STARTPTS[begin]; Taking the first input ([0]) use the trim filter to make the section you want to fade in at the end of the video. > PTS is just timebase * seconds represented as int64 number > > There are no additions with next/prev pts values. Does anyone know how to implement seeking by seconds (or milliseconds) in FFmpeg. The resulting video must have the following characteristics: duration - 60 seconds; fps - 25; throughout the video, the only selected frame of the source video is shown (staticFrameNum). video didn't work I'm using ffmpeg to encode video to mp4. wmv The -ss part works fine but the -t is ignored. avi. txt -filter:v "select=concatdec_select,setpts=PTS/4" -an output. jpg I got similar sequential filenames, but now they are starting from zero : 0. time_base units, i. 'STARTT' the time in seconds of the first frame 'INTERLACED' State whether the current frame is interlaced. In this example PTS is the beginning of the output clip and +2 means start 2 seconds in, +4 is four seconds in. mkv to start of 2. This will expand the top layer from 480 px height to 1080 height in 2 seconds and then back to 480 px in 2 seconds. The above output, however, does not have any audio attached to the output. Instead, you could put the -ss option before -i, which means that ffmpeg will first seek to the cut point, and only then start encoding. This fixes the first issue I raised. # source is FFV1 at 30fps # this produces a 1. avi -filter:v "setpts=(7/0. Set the end of this excerpt to be at second 1 (it could be whatever, this makes a 1-second exerpt). ffprobe -v 0 -show_entries packet=pts,duration -of compact=p=0:nk=1 -read_intervals 999999 -select_streams v video. mp4 -fps_mode passthrough The good news is that FFMPEG supports an extended format string "%[1-6]N" which prints fractions of the second now: https://ffmpeg. VLC fails to display the duration/position properly, but it works fine in other players. I haven't found a solution using ffmpeg or ffprobe (or something else) to output the number of frames per n:270. sh to allow it for execution. mp4 -c copy output. jpg This works, and gives me thumbnails, but they correspond to the images from the video at 0, 1, 3, 5, seconds. audio joined = ffmpeg. I want to add timestamp of current played time to a video, so I use this: ffmpeg -i video. The user waits 5 seconds before starting a recording, then records for 5 seconds: The reported duration is ~5s, while the start timestamp is at ~9s. as it were. mp4 -to 00:01:30 -c:v copy -c:a copy trimmed_example. Increasing max_delay to 15 seconds solved the issue in most cases (depends on how busy server is) I wonder if it's a good idea to increase max_delay to 15-20 seconds Say I have a video exactly 25. Use the setpts video filter in ffmpeg. However the pts options does have milliseconds: ffmpeg -i <input> -vf "drawtext=text='%{pts\:hms}'" -f flv <output> I also found out that pts supports an offset, so I was able to Question. The Usage I extract images from videos using ffmpeg. mp4 . And it would be better to wrap up your URL with double-quotes so that bash won't be confused with strange characters which will cause you stuck at FFmpeg's header section. By default this test profile is set to run at least 3 times but may increase if the standard deviation exceeds pre-defined defaults or other calculations deem additional runs necessary I need offset (some silence) in the start of file, so I tried: . pts = av_rescale_q ( pts, formatCtx->streams[videoStream]->time_base, AV_TIME_BASE_Q ); In this format, pts is in nanoseconds. 120 120 seconds 120. jpg 1. flv The issue was with the keyframe interval in input. (1) During the first 5 seconds of audio, the first 3 seconds of video are played. I'm recording screencasts and some part of the recorded screencasts I would like to speed up using a command line tool like ffmpeg. Notifications You must be signed in to change notification settings; Fork 964; Star 10. So far, my invoked cmd looks like: ffplay myfile. Only setting PTS on one of the video streams instead of both; Using This is definitely getting closer. This box provides the offset between decoding time and or the number of seconds : 0. Looking around I found a formula for h264 streams ( c++ - ffmpeg::avcodec_encode_video setting PTS h264 - Stack Overflow ): Convert a double precision floating point number to a rational. PTS have to be monotonic i. 39. wav -i b. As you see, the library give me video frame buffer address and PTS. mp4 -ss <start_time> -to <end_time> -c copy segment2. Stack Exchange Network. 2 seconds or 120 seconds 200 miliseconds 1200ms 1200 milliseconds 1300us 1300 microseconds I never rely on decimals. Assuming I have a video whose duration is 150 seconds: Elapsed 1 second since the video started: the video displays 00:01 / 02:30. 033367 s More info about timebases. How could I tell ffmpeg to Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Based on OpenBenchmarking. mp4 Reference: with the first 3 seconds frozen on the first frame. In seconds, that is (5617277014 * 300 + 501) / 27000000 = 62414. mp4; ffmpeg -copyts -i chunk. Commented Jul 2 at 1:18 @JayCravens But isn't trim is created for a very purpose to trim videos I currently use the %{pts:flt} which outputs millisecond accurate seconds. pccf gggvuh mzdtt kcpo gxihir iifci vpgtzse aluqv vjwqopv xqac