Ffmpeg scale filter. PS, wildcard file naming would be helpful .

Ffmpeg scale filter Basically using arash's method, but runnable so you can try it out. ass , unsharp=3. See FFmpeg filter HOWTO; Visualizing filters. mp4 pause and this is the watermark command. png -vf scale=3840:2160 -sws_flags lanczos out. 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. Running OpenCL filters requires you to initialize a hardware device and to pass that device to all filters in any filter graph. If I were to upscale it with ffmpeg I would just use the scale filter with the neighbor scaling algorithm, or the hqx filter, and preserve the pixel art look. g 320x240), you can use the scale filter in its most basic form: Same works for images too: The resulting image will look like this: As you can see, the aspect ratio is not the same as in the original image, so the image appears stretched. answered Aug 4, 2014 at 18:25. However, format=yuv444p creates gibberish on a output video. 1) the x265 encoder can't be successfully initialized. # Examples. These filters are mostly beneficial for VAAPI and AMD's AMF interoperability, where shared HWContexts can be used to massively speed up functions such as scaling, etc. 3. For example, height divided by 30: FFMPEG scaling, how to set scale so width AND height don't exceed a certain amount? 2. However, you can stream copy unfiltered streams while filtering others. If you have an idea why, at least why -hwaccel cuda didn't work and we have to use hwupload_cuda instead, please do add an answer. How can we scale and rotate a water mark and overlay on video using FFmpeg. Stack Exchange Network. Once scaled, I then want to apply a watermark/overlay to the video, therefore There are two issues here. png image) and name the result as [in2] (so it can be referred later) How to add multi-line text to video using drawtext filter; ffmpeg output to stdout; List all supported codecs; How to download m3u8 steam and save to mp4; MP4box appears to consider the SAR-corrected dimensions i. 0. AMD's use case, in particular, allows you to perform hardware-accelerated scaling with Vulkan, which is critical for real-time throughput with the AMF's encoders because the current The scale filter forces the output display aspect ratio to be the same of the input, by changing See the ffmpeg-scaler manual for the complete list of scaler options. In this case, 1920/1040 = 1920 x newSAR/1080, so 1920 x new SAR == 1993. ffmpeg's scale filter adjusts the output's SAR so as to preserve the input's DAR. IIRC, it involved having different parameters from the clip in question assets/static. You can simply use it like this:-vf "scale=640:-1" Which will fix the width and supply the height required to keep the aspect ratio. ffmpeg concat + scale2ref, reduced framerate. I would like to apply multiple video filters in ffmpeg. However, I'm on Windows and invoking ffmpeg via Python, so I'd like to do it all within the filter_complex clause. avi -filter:v scale=720:-1 -c:a copy output. Initially, there were a lot of "Static surface pool size exceeded". 3. g 320x240), you can use the scale filter in its most basic form: ffmpeg -i input. If you want to do calculations based on the amount of frames, you will probably have to extract the nb_frames attribute from the output of ffprobe -show_streams -i "big_buck_bunny. jpg -vf scale=320:240 output_320x240. ffmpeg -i test. 133k 30 30 gold badges 254 254 FFmpeg has two filters to scale the video: scale and zscale - zscale has spline16 and spline36 parameters (they represent Spline16 and Spline36 variants of the algorithm), scale has spline parameter. 1 1 1 silver badge. I'm using ffmpeg to create a mosaic of videos using the xstack filter. llogan llogan. mp4 static int insert_filter(AVFilterContext **last_filter, int *pad_idx, const char *filter_name, const char *args) Definition: ffmpeg_filter. The final command line (split to multiple lines for better readability): One proposed scaling technique for accelerating both software-only and T408 processing is cascading scaling, where you create a filter complex that starts at full resolution, Video Filter – Lanczos. c源码分析 decode_audio解码音频帧—ffmpeg. ffmpeg, scale and hardcoded subs. That sample uses these filters ; "scale=78:24,transpose=cclock" I compiled and run it with a sample video file but it just outputs fancy characters to console, applies specified video/audio complex filter [1]scale=50:50[in2] applies scale filter to input [1] (in. I'm having trouble getting this command to work in FFMPEG, basically I am trying to add two images, scale them, add zoom effect, and Filters need to be concatenated in the desired fashion, not necessarily as above. What is the scaling algorithm of the FFmpeg scale filter? 2. ffmpeg - resize video and merge with image. avi Same works for images too: ffmpeg -i input. -aspect[:stream_specifier] aspect (output,per-stream) Set the video display aspect ratio specified by Runnable example in FFmpeg 2. The scale_vaapi and deinterlace_vaapi filters act on vaapi format frames to scale and deinterlace them respecitvely. 10. Default value is the input @maf-soft Because the comma is usually used by ffmpeg to separate filters in a filter chain (in the above example, between scale and pad). mkv The -1 will tell ffmpeg to automatically choose the correct height in relation to the provided width to preserve the aspect ratio. What is the version of FFmpeg? What OS are you using Windows or Linux? I've found out that yes, ffmpeg applies the filters in the order specified; thus it's not a good idea to e. Here's an example template: ffmpeg -i input. mp4 indicates the video file you are resizing. hardsub subtitles first and then apply sharpening filter, e. mkv -vf scale=1280x720 -c:v h264_amf output. png gifski -o clip. I eventually figured out how to do it. input('input. For advanced options in scale_cuda, see ffmpeg -h filter=scale_cuda. Parameter "c" for bicubic. ffmpeg incorrect border width of ass subtitles. 如果想要简单地把图片resize为指定的宽高 320x240，可以使用 scale 过滤器的基本用法： This stream base_object has two properties, # audio and video . Rendering pixel perfect subtitles for small videos. More 今天我们来说一说ffmpeg工具内的scale过滤器，很显然从字面上理解，这个是缩放的！ 下面这张是本文所使用的原始图片，分辨率 535x346。 简单缩放. Here's an example of converting an MP4 video to an MKV video using the scale filter to resize the video: I'm not completely answering your question, but this might be of help finding it. Visit Stack Exchange Another working option is to use -hwaccel nvdec without the hwupload_cuda option, e. ffmpeg -i videoencode. avi -i 4. Just prepend your filterchain with [1:v]scale=320:240 [ovrl],[0:v][ovrl]. mp4 In FFMPEG, scaling is achieved by applying a filter to the video stream. ffmpeg scale filter takes too long. mkv Nothing else happens for a little bit until I get this: When I execute: ffmpeg -filters I see the following entry for the zscale filter:. If you need to simply resize your video to a specific size (e. You need specifie that you are want to use hardware acceleration. Its command-line interface allows for a wide range of operations, including conversion, encoding, filtering, and more. param_b. Commented Apr 7, 2021 at 17:55. m4v. it considers the frame dimensions to be iw*sar x ih. I wanted simply to fix a video with a wrong AR, so I ran ffmpeg -i input. Also there is a useful discussion there. If you want to reduce the video FFMPEG filter_complex wih speedup and subtitles and scaling 0 Only '-vf scale. mp4" first. 2) due to potential rotation, you can't target the correct side. mp4 Of course, you can change the factor here. mkv -c:a aac -c:v h264_nvenc \ -c:s ffmpeg -vsync 0 -hwaccel cuvid -i input. The -1 means that the height will be set automatically. mkv -filter_complex [0:v]scale=1920:1080:force_original_aspect_ratio=decrea Skip to main content Basically, can the rotate and scale filters print their values, per frame? Zoompan answers are valid. I know that scale filter can work with lanczos/spline algorithms Work the same as the identical scale filter options. e. Use the NVIDIA Performance Primitives (libnpp) to perform scaling and/or pixel format conversion on CUDA video frames. 本文介绍FFmpeg 滤镜函数的三种用法，以scale send_frame_to_filter滤镜处理—ffmpeg. png -filter_complex "[0:v]scale_cuda=w=1920:h=1080 -vf "scale=w=416:h=234:force_original_aspect_ratio=decrease" To:-vf "scale=w=416:h=-2" Should scale to a width of 416 and scale the height appropriately so the aspect ratio keeps the same. Any ideas on the proper syntax to get crop to work with resizing and overlay all in one go? The crop parameters are crop=1728:970:96:54 and I'm trying to work them into: ffmpeg -loop 1 -i See the FFmpeg scale video filter documentation for more info. 1, scale2ref has been merged into existing scale filter with secondary reference input: scale=-1:rh/8 Note that this filter outputs single stream of the modified one instead of two video streams. After that it will, however, make sure that the calculated dimension is divisible by n and adjust the value if necessary. : ffmpeg -hide_banner -hwaccel nvdec -hwaccel_output_format cuda -i "input-1080p. I know of the -vf scale filter such as -vf scale=-1:320, but that only takes the width and scales the height accordingly. Parameter A for scaling filters. Sometimes ffmpeg inserts different filters (ex: pixel format conversion filters) into a filter graph The basis of scaling a video with FFmpeg uses the scale flag after the filtergraph (-vf), then you can either do basic video scaling such as upscaling the video to twice the original resolution: ffmpeg -i input. mp4 -i input2. png -filter_complex "overlay = 10: 10" videofull. I know, for example, that almost all of these methods perform simple operations like scaling, but what about more complicated ffmpeg filters like the new v360 filter or the mestimate filter? Don't use cuvid, it is not better decoder in 2020. Generate one short video procedurally, and then convert it to 3 different sizes. E. FFmpeg complex filter and -vf to pad and scale images to video. ffmpeg scale sampling algorithm. org> wrote: > Hello, I am trying to do full hardware video transcoding with scaling. Set the output video dimension expression. This uses the nearest neighbour algorithm to upscale a video as close as possible to the desired resolution x amount of times (in this case going from the original video's 320x176 to 1920x1056) and then uses the standard scale filter to go up the few remaining pixels. mkv" -filter_complex "[0:V:0]hwupload,scale wiki: Scaling (resizing) with ffmpeg. Visit Stack Exchange Working command without using GPU to scale: /usr/local/bin/ffmpeg -y -v [Parsed_scale_npp_0 @ 0x56164efb58c0] auto-inserting filter ‘auto_scale_0’ between the filter ‘graph 0 input from stream 0:0’ and the filter ‘Parsed_scale_npp_0’ Impossible to convert between the formats supported by the filter ‘graph 0 input On Thu, 21 Mar 2019 at 05:25, Александр via ffmpeg-user < ffmpeg-user at ffmpeg. If one and only one of the values is -n with n >= 1, the scale filter will use a value that maintains the aspect ratio of the input image, calculated from the other specified dimension. Visit Stack Exchange I found a few options to scale videos in FFmpeg with Lanczos3 algorithm: -- scale=X:Y:flags=lanczos / scale=X:Y:flags=lanczos+accurate_rnd-- zscale=X:Y:filter=lanczos How does compare the output quality of zscale filter to the output quality of scale filter?. avi -i 3. As mentioned previously, we recommend doing any image resizing outside of ffmpeg, especially if your sources are OpenEXR and you are going to do a colorspace conversion, prior to encoding, this will ensure that the filtering is done in linear space, which will produce less artifacts. How to rescale input video then scale and overlay watermark with Ffmpeg? 0. And if you need to scale video, use '-vf scale_vaapi=640:360' to scale video without string like 'format=nv12,hwupload' Share. If the input image format is different from the format requested by To ensure the original aspect ratio is preserved, you can use FFmpeg's -vf scale filter with a dynamic scaling approach. mp4 designates the Image name for the resized video. I have a working command, but its very slow. mp4 frame%04d. You can sidestep this problem by setting SAR to 1 after the scale. – You just need to prepend the crop and scale filters to the reverse filter. . what does -crf mean in ffmpeg resize video file command? 0. png If your input has more than 20 fps, then ffmpeg will drop frames to convert to 20 fps. – llogan. ffmpeg -i 1. mp4 -vf "scale=1280:720" resized_video. Viewed 1k times Part of Mobile Development Collective 0 . Libavfilter will automatically insert scale filters where format conversion is required. FFMPEG Scale video without filtering. ffmpeg -i video. mp4 -i watermark. mp4 Since the DAR may no longer be the same, the output can look distorted. assign the video stream to a new variable, we will be creating filters to only video stream, # as indicated by [0:v] in ffmpeg command line. 0 to 7. JPG" -filter_complex "\ [0:v]crop=3300:3300,scale=900:900[vid]; \ When decoder output is in hardware surfaces, the frames will be given to following filters or encoders in that form. mp4" -vf > scale_cuda=-2:360 -c:v h264_nvenc -b:v 2000k "output. The values in scale and pad are derived dynamically and correspond to the video height and video width. I may add more filters. This is the example video used above. According to its description, accurate_rnd "enables accurate rounding" so I think that One of the great features of ffmpeg filtering library is the ability to create overlays, ffmpeg -i 1. c:423 AVFilterContext::input_pads ffmpeg -i input0 -i input2 -filter_complex "[0:v]scale=640:-1[v0];[v0][1:v]vstack=inputs=2" output For a more advanced method to fit any size video into a specific size while preserving aspect ratio see Resizing videos with ffmpeg to fit Return a normalized Gaussian curve used to filter stuff quality = 3 is high quality, lower is lower quality. here's my ffmpeg cmd: ffmpeg -i input1. mp4 I thought it had something to do with the Scale of the video but honestly every scale code I tried to use deformed the image a lot. In this post, we look at four approaches to scaling. 264 videos at various output resolutions and bit rates. -1 can also be used for width if you provide a given height. The values of the w and h options are expressions containing the following constants: in_w, in_h FFmpeg is a powerful tool for handling multimedia data. mp4" -map 0 -c:v hevc_nvenc -preset p7 -tune hq -b:v 2. mp4 -vf scale=iw*2:ih*2 output. More void sws_scaleVec (SwsVector *a, double scalar) Scale all the coefficients of a by the scalar value. To resize a video to half its original width and height while Developing your own Filters. Just allow ffmpeg to choose the decoder by himself. Command Line Tools Documentation ffmpeg -i video. png It generates good per-frame palettes, but also combines palettes across frames, achieving even thousands of colors per frame. Parameter B for scaling filters. 0:1. Ask Question Asked 4 years, 7 months ago. FFmpeg drawtext on a range of frames. Commented Mar 3, 2021 at 2:09. *ffmpeg -filters | grep scale" to check – Sir_Scofferoff. ffmpe I've asked this a long time ago, but I've actually got a solution which was not known to me at the time -- in order to keep the aspect ratio, you should use the video filter scale, which is a very powerful filter. Setting the output width and height works in the same way as for the scale filter. my_vid_stream = mystream. ffmpeg scale doesn't work if destination res is larger than source. Context Navigation +2; Start Page; Index; History; See Scaling. Use the color option in the pad filter. Add a comment | Your Answer Reminder: Answers generated by artificial intelligence tools are not allowed on Stack Overflow. 5M -maxrate 8M -vf "scale_cuda=-2:720:format=yuv420p" -c:a copy -c:s copy "output-720p. I'm trying to concat some video into one single video using ffmpeg. c:\ffmpeg\bin\ffmpeg -y -i football_4K30_all_264_short. ffmpeg; Share. i do not want to do 2 times encode video This is the best answer by far. Thanks for FFmpeg simplifies this process by offering different resizing options. How to have ffmpeg calculate the width after modifying by set height ratio? 3. Please use the scale filter directly to insert it at the beginning or some other place. It then splits the stream. Thanks ! ffmpeg; video-processing; Share. avi -filter:v "crop=1280:670" output_video. You can see my desired scenario below, except the Scale video filter would use scale_cuda and thereby keep all the computation on the graphics card. Does anyone know what variant of Spline algorithm is that spline from scale? ffmpeg; video; video-conversion; 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 I got it to work by putting both the crop and the scale in the same -vf tag. What you need to do is to first scale and then pipe that video output into the concat filter like so: ffmpeg -i input1. mp4 -vf scale=480:360,setsar=1 newVideo. The thing about FFmpeg is that there are almost always multiple ways to accomplish the same basic function. Note that both scale_npp and scale_cuda now support divisibility tests (by 2, etc) and forced aspect ratio(s), introduced by this change. mp4 -i overlay. PS, wildcard file naming would be helpful 1:N HWACCEL Transcode with Scaling. scale2ref=oh*mdar:ih/8 (FFmpeg version 4. It Is there a way to force the ffmpeg command-line to display a comprehensive list of all filters and their parameters, even those that are applied automatically like -vf scale? (EDIT: To clarify, I do not mean filter documentation, but rather displaying filters that are instantiated at runtime for a particular command-line, just before transcoding starts. It is done through video filter in FFmpeg. See more A filtergraph has a textual representation, which is recognized by the -filter/-vf/-af and -filter_complex options in ffmpeg and -vf/-af in ffplay, and by the avfilter_graph_parse_ptr() ffmpeg -s:v 1280:720 -r 25 -i input. These are not the same thing. Then you can perform the calculation and insert the result into your command with the correct tile filter. The following additional options are accepted: Scaling is a very common operation in transcoding. 4, video filter drawtext supports arithmetic expressions in its fontsize parameter. This is my FFmpeg command. You could do it at once (e. video # ffmpeg. But please explain how to control the different values. gif frame*. To resize a video by specifying the desired width and height, use the following command: ffmpeg -i input. Filtergraph, Chain, Filter relationship The FFMpeg filters must output a video that follows the following rules: If the video is vertical, permutate the maxheight and maxwidth values FFMPEG Scale video without filtering. 8. mp4 -vf scale=320:240 output. However with this commando FFmpeg complains that -filter_complex and -vf can not be used in the same commando. I may use one or all of these filters: yadif, hqd,nlmeans,curve,convolution and scale. avi -vf scale=320:240 output. -vf scale=320:240 tells FFmpeg to apply a scaling filter to change the video’s dimensions to 320 pixels in width and 240 pixels in height. On 2013-11-28 21:06, Lou wrote: > On Wed, Nov 27, 2013, at 01:05 PM, James Darnley wrote: >> Does the force_original_aspect_ratio option of the scale filter work as >> described in the online docs?>> >>> One useful instance of this option is that when you know a specific >>> device’s maximum allowed resolution, you can use this to limit the >>> output video to that, while Since ffmpeg version 3. Improve this answer. Assuming ffmpeg reads and does filter one at the time from left to right, Which filter should be done first or last? Specially the scale filter should be very last or first? Return a normalized Gaussian curve used to filter stuff quality = 3 is high quality, lower is lower quality. [0:v]crop,scale,reverse[r], but you need to apply it both to your original video as well as the reversed one, so create two filter chains: ffmpeg -i "C:/01/test-%02d. Parameter "b" for bicubic, and the number of filter taps for lanczos. Part 4: Examples of Video Scaling with FFMPEG To help illustrate the tips and tricks we’ve discussed, let’s look at some examples of video scaling with FFMPEG: Upscaling a 720p video to 1080p: ffmpeg -i input. mp4" > > Input stream info: > Stream The following documentation is regenerated nightly, and corresponds to the newest FFmpeg revision. mp4 If filter parameters are used in transcoding, users can’t set hwaccel_output_format parameters. The format is ‘wxh’ (default - same as source). If you need to simply resize your video to a specific size (e. ' read, ignoring remaining -vf options: Use ',' to separate filters even though no other vf present Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported I ask if there is a way to apply a anti-aliasing filter with ffmpeg or other tools to my videos. ffmpeg -i oldVideo. FFmpeg has two filters to scale the video: scale (documentation) and zscale (needs z. 2 The scale filter forces the output display aspect ratio to be the same of the input, by changing the output sample aspect ratio. If this chain has to send a video stream back to the CPU for software scaling, and then back to the card, there will be a huge performance penalty. ffmpeg -hwaccel d3d11va -i input. yuv. mkv is it possible using if/else statement in ffmpeg ? I would want to tell ffmpeg if dimension of any video lower than 480p do not touch the height or width otherwise do encode and resize it to 480p, here's my command but it always scale up the video if the video lower than 480p I'm trying to scale a video, and then apply an overlay keeping the aspect ration of the same. mp4 -filter:v "scale=w:h" output. Follow edited Jun 20, 2020 at 9:12. The remedy is to reset the SAR after scaling. C zscale V->V Apply resizing, colorspace and bit depth conversion. width, w, height, h. If your input has less than 20 fps, then ffmpeg will duplicate frames to convert to 20 fps. Here's another way to The closest question I've come across is Scale watermark overlay by video size with ffmpeg but that answer uses external Linux/Cygwin commands. 0:3. mp4')) and rescales it. lib library, documentation): There are two good algorithms to downscale the video (): Lanczos (variants: Lanczos3, Lanczos4 and others, documentation) and Spline (variants: Spline16, Spline36 and others, documentation). ͏ Y'UV on the other hand specifies a colorspace consisting of luma (Y') and chrominance (UV) components. 6 Zooming animation in FFMPEG. mp4 to make sure that ffmpeg -i input -vf scale=iw/2:-1 output FFmpeg assumes the option names in the order they are declared in the source code. If the scale is meant to preserve the image's aspect ratio, use. ffmpeg scaling not working for video. Rescaling and slowing down a movie at the same time with ffmpeg. By quoting it, ffmpeg will not interpret the comma that way, but use it as part of the first option passed to scale , which is min(1280,iw) . One stream is for listening during playback (out1), and the other stream (a) is consumed by the showcqt filter and turned into video (vfun). mp4 -tune psnr -refs 3 -c: v libx265 -preset veryslow -crf 33 -vf scale = 640x360 videoencode. mp4 -vf "fps=20,scale=1920:1080" 240_scaled/out%d. Members Online • marmota I think my issue is somewhere in the -vf scale=w=1280: Stack Exchange Network. Lanczos can use additional parameter here: param0 is defined as "the width (alpha)", its default value is 3. Note: The scale filter can also automatically calculate a dimension while preserving the aspect ratio: scale=320:-1, or scale=-1:240 -vf scale_npp=1280:720 if ffmpeg says no scale_cuda filter. Community Bot. 16 FFMPEG Scale video without filtering. I ended up using ffprobe to go through those parameters one by one and then used ffmpeg to modify assets/static. More void sws_normalizeVec (SwsVector *a, double height) Scale all the coefficients of a so that their sum equals height I'm trying to deinterlace a frame using ffmpeg (latest release). like this: -vf "scale=1920:1080 , subtitles=subtitles. Ask Question Asked 13 years, 2 months ago. Execute ffmpeg -h filter=scale_qsv, and verify the output is QuickSync video scaling and format conversion. – Alex. ffmpeg not resize video with dvd format. scale_cuda =-2: 720: format = yuv420p; Upscale to 4K using nearest neighbour algorithm. ffmpeg -i in. Modified 13 years, 1 month ago. Code Syntax with Example. The C means "Command support", but I don't understand what that means. png The resulting image will look like this: s EdgeDetect Foobar g libavfilter vf_edgedetect c libavfilter vf_foobar c edit libavfilter and add an entry for foobar following the pattern of the other filters edit libavfilter allfilters and add an entry for foobar following the pattern of the other filters configure make j< whatever > ffmpeg ffmpeg i you should get a foobar png with Lena edge detected That s your new playground is FFmpeg can use scale/sws_flags with lanczos and spline parameters. -filter_complex If you are inputting a series of images, and the images vary in size, add the eval=frame option in the scale filter, such as: ffmpeg -i input -vf "scale=1280:720:force_original_aspect_ratio=decrease:eval=frame,pad=1280:720:-1:-1:color=black" output Changing the background color. Learn more. Below is a description of the currently available OpenCL video filters. 2 FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. Improve this question. I am using below command to scale and blur a video but it is very slow. 0 How add scale in my ffmpeg command. mp4 -vf scale=2000:100,setsar=1 2. Default value is the input To resize a video using FFmpeg, you can use the scale filter set using the -vf (video filter) option. . I hope someone can help As an output option, this inserts the scale video filter to the end of the corresponding filtergraph. Lanczos can use additional parameter here: param_a is defined as "the number of filter taps", I don't know its default value. Download in [10:48am] <BBB> why keep the option there [10:48am] <ubitux> people will bug you to implement it because it's the perfect filter [10:48am] <nevcairiel> many of the various filters are just different kernels over the same kind of filter, so preserving them costs you practically nothing [10:48am] <BBB> do you know how many people thought x264 was the best encoder ffmpeg -i input. Share. Note: ͏ The term "YUV" is ambiguous and often used wrongly , including the definition of pixel formats in FFmpeg. 標準で使えるscaleフィルタの使い方。外部ライブラリにzscaleフィルタがありこちらはHDR、高品質リサイズ向けで処理速度はscaleフィルタより速くない。2022年3月4日のコミットで同程度に速くなった。. output. You can use two additional parameters for the crop filter to set the position of the cropping window. 1) Edit: Since FFmpeg 7. mp4. Related with this question, I can get the filter I want using this sentence: AVFilter *filter = avfilter_get_by_name("yadif"); After that, I open the filter context as: AVFilterContext *filter_ctx; avfilter_open(&filter_ctx, filter, NULL); My first question is about this function. mp4" But this runs at only about 240 There is a chance that your FFmpeg version has no scale_qsv filter. Note that while using the GPU video encoder and decoder, this command also uses the scaling filter (scale_npp) in FFmpeg for scaling the decoded video output into multiple desired The scale filter will adjust the sample aspect ratio to maintain the original display aspect ratio, which is 16:9 for your input. So it is not possible to filter and stream copy the same stream at the same time. answered May 9 Parsed_amerge_5 Consider inserting the I'm having trouble figuring out precisely which filter graph operations are supported by each of the available hardware acceleration methods. FFmpeg can use zscale with lanczos, spline16 and spline36 parameters. 5" (that's how I And a 1980 x 400 pixels videos. In case the message is Unknown filter 'scale_qsv', update FFmpeg. To enable compilation of these filters you need to configure FFmpeg with --enable-opencl. 映像に余白 SWS_Flags . Im trying to scale a video so that it is always 512 wide where the height changes in proportion to the original video. To me this has to be its most underrated feature, or at least it would be if the documentation mentioned anything about them and how they worked. sweb@sweb-laptop:/tmp$ ffmpeg -i Wildlife. mp4 -vf setdar=16/10 output. The following function takes a stream (for example stream = ffmpeg. mp4 -filter_complex \ ffmpeg -i <input_video> -vf sr=dnn_backend=tensorflow:scale_factor=3: Use one of these models in ffmpeg with sr filter (or dnn_processing filter), as stated in documentation. mp4 so how to unify in 1 command only? I am confused. 2. Resizing by width and height. This way all global metadata on the input file will be copied as global metadata to output file and only the rotation meta-data is changed. I was cropping and then increasing the size of an old video game, and I just did this:-vf crop=256:192:2:16,scale=-2:1080:flags=neighbor I knew it worked as soon as I saw it display the output file size as 1440x1080 (4:3 ratio at 1080p). For posterity: The accepted answer does not work if the input sources are of different sizes (which is the primary reason why you need to scale before combining). But there is a small improvement to do. We found that if you’re scaling using the default -s function (-s 1280x720), you’re leaving a bit of quality on the table as compared to other methods. As with the crop filter, to resize a video you use the FFmpeg scale filter, with a combination of options. crop_x , crop_y Set the input crop x/y expressions, default values are (iw-cw)/2 and (ih-ch)/2 . I would like to refrain from first scaling down the images or creating video files from them and then overlay these videos. The following command reads file input. Related questions. Actually -vf and -af serve the same purpose as -filter_complex, but in simplest manner. c源码分析 FFmpeg解码模块总结 For example if your command line is of the form: ffmpeg -i infile -vf scale=640:360 outfile your GRAPH_DESCRIPTION string will need to be of the form: nullsrc,scale=640:360,nullsink you may also need to set the nullsrc parameters and add a format filter Use the scale filter with animation, available since v4. Use the SAR filter to reset the SAR after scaling. So, scale videos using ffmpeg either with -vf scale or just -s, but don't trust Quicktime Player to show them to you at the correct size. FFMPEG - Scale video filter not providing expected results. 1. Note: you might need to install TensorFlow C library and configure ffmpeg if In the filter chain, you must first scale the image separately, and then perform the overlay. Example to filter video and stream copy audio: ffmpeg -i input -filter_complex "[0:v]scale=iw/2:-1[v]" -map "[v]" -map 0:a -c:a copy output See the ffmpeg documentation for more info. c源码分析 configure_filtergraph配置滤镜容器—ffmpeg. avi -i 2. mp4 -y ^-c:v libx265 -an -force_key_frames expr:gte^(t,n_forced*2^) The scale filter in FFmpeg enables us to adjust the dimensions of a video. ffmpeg_encoder_init_frame and ffmpeg -i input. FFmpeg resize without upscaling. yuv -vf scale=1920x1080 -c:v rawvideo -pix_fmt yuv420p out. How to rescale input video then scale and overlay watermark with Ffmpeg? 2. Replace the placeholders with your specific @kup So, this issue got resolved a while back, and I'm struggling to remember exactly what I did to fix it. -aspect[:stream_specifier] aspect (output,per-stream) Set the video display aspect ratio specified by FFMPEG Scale video without filtering. mp4 and transcodes it to two different H. mp4 -vf "scale=w:h" resized. scale_cuda = 4096: 2160: interp_algo = nearest; Don’t do any conversion or scaling, but copy all input frames Stack Exchange Network. Scale input to 720p, keeping aspect ratio and ensuring the output is yuv420p. Consult your locally installed documentation for older versions. Downscaling Video With FFMPEG - Setting Max Width and Height. These options are marked 'T' on the output of ffmpeg-h filter=<name of filter>. ffmpeg - Add, scale and set potision of multi watermarks by duration to video. mp4 -vf "scale=2*iw:-1, crop=iw/2:ih/2" output. Scaling and stacking 2 videos. mp4 The scale filter preserves the input's DAR in the output, so that the output does not look distorted. ͏ A more accurate term for how colors stored in digital video would be YCbCr. 1 ffmpeg - scale not working on all my cases. -2 = scale using mod 2 -4 = scale using mod 4 etc. This adds the overlay, but it stretches it to the same aspect ratio of the video which is what I'm trying to avoid: Interesting problem - looking at the ffmpeg or ffprobe output you notice that there is SAR and DAR (source/dest aspect ratio?). However the scaling algorithms can still get called when remapping chroma from FFMPEG Scale video without filtering. Follow edited May 9, 2022 at 3:35. Adjust the filter parameters: As with upscaling, you can adjust the parameters of the scaling filter to achieve the best results for your specific video. > > Here is my console command: > ffmpeg -hwaccel nvdec -hwaccel_output_format cuda -i "input. avi -filter_complex " nullsrc=size=640x480 [base]; [0:v] setpts=PTS-STARTPTS, scale=320x240 [upperleft]; [1:v] setpts=PTS-STARTPTS, scale=320x240 [upperright]; [2:v] setpts I'm trying to implement a Hardware scaling filter (vf_scale_d3d11) using the VideoProcessBlt D3D11 DDI, and also add PIX_FMT_D3D11 support for the MediaFoundation Encoder (mfenc). It does this by adjusting the SAR of the output. It didn't want to allow -c:v copy!However, when I played the video with mpv, there was: VO: [gpu] 600x480 => 768x480 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 Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported 本文介绍FFmpeg 滤镜函数的三种用法，以scale send_frame_to_filter滤镜处理—ffmpeg. m4v -map_metadata 0 -metadata:s:v rotate="90" -codec copy output. Let’s apply the scale filter to restore the cropped video to its initial resolution: $ ffmpeg -i cropped_video. So far I've mostly used the default scale filter method to scale the x264 video resolution down, for example -vf scale=720:576 but I've noticed that some people often use -vf scale=720:576:flags=name (or -vf scale=720x576:flags=name) where name is ffmpeg -i input. FFmpeg scaling issue. wmv -sn -acodec libvorbis -vcodec libvpx -b:a 12 Allows for the same expressions as the scale filter. I encountered the same problem, and this question was one of the top search results. Using the vaapi_scaler in the video filters: It is possible to use Intel's QuickSync hardware via VAAPI for resize and scaling (when up-or downscaling the input source to a higher or lower resolution), using a filter snippet such as the one shown below: vf 'format=nv12,hwupload,scale_vaapi=w=1920:h=1080' The following command should work: ffmpeg -y -hwaccel cuda -hwaccel_output_format cuda -i video1. More void sws_normalizeVec (SwsVector *a, double height) Scale all the coefficients of a so that their sum equals height. mp4 and the clips I was merging it with. As an output option, this inserts the scale video filter to the end of the corresponding filtergraph. I changed a filter to format=yuv420p and everything seems to be OK. Here’s the breakdown of the command:-i input. The asplit filter is used to duplicate the audio stream. Last modified 7 years ago Last modified on Dec 19, 2017, 6:14:39 AM Note: See TracWiki for help on using the wiki. ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input -c:v h264_nvenc -preset slow output If ffmpeg was compiled with support for libnpp, it can be used to insert a GPU based scaler into the chain: ffmpeg -hwaccel_device 0 -hwaccel cuda -i input -vf scale_npp=-1:720 -c:v h264_nvenc -preset slow output. I need the video to convert maintaining aspect ratios. OpenCL Video Filters. That's why ffmpeg resticts using -filter_complex in combination with -vf and/or -af I did some googling on how to use the scale_vulkan filter and about Vulkan on ffmpeg, but it appears there's only a few support Anyway, I tried two different commands hoping the filter would work: ffmpeg -hide_banner -init_hw_device vulkan=gpu:0 -filter_hw_device gpu -i "input. In particular it allows one to perform image rescaling and pixel format conversion. Modified 4 years, 6 months ago. png -vf scale=3840x2160:flags=lanczos I went down the list upscaling a 720p image to 4k using the various ones on the documentation, lanczos is input above. To avoid loosing the remaining meta-data (such as date, camera) on the video do ffmpeg -i input. The input videos may come in varying dimensions, so I'm using the scale filter to scale them beforehand, and I'm using the force_original_aspect_ratio option and then the pad filter to keep the original aspect ratios of each video and add black bars to the sides to make each video have the The scale filter forces the output display aspect ratio to be the same of the input, by changing See the ffmpeg-scaler manual for the complete list of scaler options. If I just execute "ffmpeg -i" I get: @Sodj Here is the answer: ffmpeg -i input. It blew my mind when I recently came across something new about FFmpeg despite having used it for years - the fact that it comes out of the box with advanced conditionals like if statements and lt/gt for filters. The name of the command is the name of the option and the argument is the new value. @Rotem The second command works with no more errors related to impossible converting. You can chain linear filters together with commas: ffmpeg -i 240_video. For instance, in this use of the scale filter, FFmpeg assumes the option name width for the value iw/2, and the name height for the value -1. The filter is responsible for resizing the frames in the video, along with other adjustments such as cropping I want to take a video, scale it to it's width minus width of added image, then add that image's width as padding and overlay image in that space. Can anyone please help if i can improve the But i want to apply overlay images to raw frames using FFmpeg "overlay" filter after decoding H264 packets. How to scale and add correct a logo in ffmpeg command? 0. c源码分析 FFmpeg解码模块总结 I want to add a PNG watermark and then scale my video. png I got this from source. FFmpeg watermark was also helpful while I was figuring ffmpeg out. avi -i input2. Hardware decode and hardware encode with scaling. g. I'm wondering what kind of scaling algorithm is used to do down scaling (bilinear, Using the scale filter will provide more flexibility: The -1 will tell ffmpeg to automatically choose the correct height in relation to the provided width to preserve the aspect The FFmpeg rescaler provides a high-level interface to the libswscale library image conversion utilities. mkv -c:a aac -c:v h264_nvenc \ -c:s webvtt -crf 20 -filter_complex \ '[v:0]hwupload_cuda,split=2[vtemp001 -1:0,scale_npp=w=960:h=540:interp_algo=linear \ -b:v 2000k I am using ffmpeg for android to produce video with mp4 format. filter() takes the upstream node followed by the name of the filter, followed by the configuration Here's what I've tried so far: ffmpeg -vsync 0 -hwaccel cuvid -i input. roend vjxfr pcpeumz ldiow qbw njjs ecweblks gpueeode rnqbaclu yejpgea