Ffmpeg scale filter

Dec 11, 2015 · Filters need to be concatenated in the desired fashion, not necessarily as above. 3 *. I hope someone can help me, fairly new to FFMPEG but really enjoying it this far. This adds the overlay, but it stretches it to the same aspect ratio of the video which is what I'm trying to avoid: Feb 13, 2023 · I want to scale input video to 1920x1080, then overlay image. Default is unset. height, h. In some cases this may work, but in most cases it fails. In case the message is Unknown filter 'scale_qsv', update FFmpeg. . Just prepend your filterchain with [1:v]scale=320:240 [ovrl],[0:v][ovrl] . ffmpeg -i input. jpg -vf scale=320:240 output_320x240. Jan 24, 2017 · I have tried using the scale2ref filter, but I don't understand the documentation, and the example they give makes no sense to me (see examples below). One stream is for listening during playback (out1), and the other stream (a) is consumed by the showcqt filter and turned into video (vfun). To resize a video by specifying the desired width and height, use the following command: ffmpeg -i input. 5 *. I currently do that in two passes: resize: ffmpeg -i input. ガンマ補正を行う。既定値では行わない。 ffmpeg -i input -vf scale=1280:-2 -gamma 1 output. The final command line (split to multiple lines for better readability): ffmpeg -i video. "[0:v]scale=1024:576:force_original_aspect_ratio=1[v0]; \. ) Transcode to two different outputs (one at constant-quality and one at constant-bitrate) from the same input: You can scale like this if you remove black bars : -filter:v "crop=1920:800:0:140,scale=1280:-2". 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. 5" (that's how I found it out accidentally) – FFmpeg can use scale / sws_flags with lanczos and spline parameters. srt and making font size of 24 with red font color. png \ -filter_complex "[0:v][1:v] overlay=100:820:enable='between(t,3,8)',fps=fps=60" \ -pix_fmt yuv420p -c:a copy /output. FFmpeg can use zscale with lanczos, spline16 and spline36 parameters. For aspect ratio use -aspect Eg. [1:v]scale=1024:576:force_original_aspect_ratio=1[v1]; \. 1 /*. mp4 Jul 29, 2017 · I am using ffmpeg v3. ffmpeg -i 1. Current overlay command: ffmpeg -i test. 3 Filters Video scale. png -i INPUTVIDEO. while preserving the aspect ratio (most wanted) to a width of 960. png. jpg" -vf scale=out_color_matrix=bt709,eq=gamma=1:saturation=1 Feb 12, 2022 · 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. Dec 2, 2020 · Thus, the height is scaled to 1080 / 6 = 180 pixels. 2 * ffmpeg filter configuration. 3. Correctly signalling 601 in output metadata will depend on analog source. ffmpeg -i input -vf "scale=-1:720,pad=1280:ih:(ow-iw)/2" output Mar 20, 2021 · 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. mp4 -filter:v scale=1920:-1 -c:a copy output. isr, in Aug 10, 2017 · You could do it at once (e. Basically using arash's method, but runnable so you can try it out. Example using subtitles file subs. However, you can stream copy unfiltered streams while filtering others. 2 days ago · The ff* tools have a -bsf option applied per stream, taking a comma-separated list of filters, whose parameters follow the filter name after a ’=’. 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. g. Once, you have installed ffmpeg, you can resize: a mp4 video. I knew it worked as soon as I saw it display the output file size as 1440x1080 (4:3 ratio at 1080p). I got it to work by putting both the crop and the scale in the same -vf tag. For specifying the height, we can use something Feb 11, 2023 · For all rungs below 4K, FFmpeg scales the original source footage down to the target resolution using the bicubic scaling algorithm, So, we had two proposed methods which I expanded to four, as follows. mp4 -i input2. ffmpeg distinguishes between two types of filtergraphs: simple and complex. ffmpeg -i "i. Scale (resize) the input video, using the libswscale library. The zscale filter forces the output display aspect ratio to be the same as the input, by changing the output sample aspect ratio. To me this has to be its most underrated feature, or at least it would be if the documentation mentioned anything about them and Feb 26, 2024 · The scale_npp filter causes the following error: Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter May 13, 2014 · Runnable example in FFmpeg 2. Feb 11, 2021 · Scaling by resolution with the ratio. In DaVinci Resolve, for instance, all you need to do is right-click on a clip in the media pool, select "clip attributes," then at the bottom of the "video" tab, change "Super Scale: None" to 2x, 3x, or 4x. would give you the in and out channels for the scale2ref filter (VV->VV), i. 1. No need for the movie source filter as in the other examples. FFmpeg watermark was also helpful while I was figuring ffmpeg out. Resizing by width and height. mp4 -vf "scale=1920x1080:flags=lanczos, noise_reduction=20:2" -c:a copy output. Jan 26, 2014 · To customize the subtitles you can use the force_style option in the subtitles filter. 7 * modify it under the terms of the GNU Lesser General Public. -filter_complex can be used to combine many filters together. 0. -t 8 -i image1. ffmpeg -help filter=scale2ref gives you info on the parameters of the filter. But mid-stream changing of size isn't supported by many other filters. This option is only used for special remapping. I have a bunch of content in 3360 x 2100 that I need to resize to 1920 x 1080. Feb 21, 2020 · ffmpeg -y -i input. Jul 17, 2021 · The scale filter has an option called force_divisible_by for this, scale=w=1280:h=720:force_original_aspect_ration=decrease:force_divisible_by=2 FFMpeg: scale and Go to the documentation of this file. Notice that once you start decoding-filtering-encoding (i. 4. Same works for images too: ffmpeg -i input. In fact I can see 3 different things: there's a) a list of all filters technically supported by ffmpeg, b) a list of all filters compiled into a particular ffmpeg executable, and c) a list of all filters (with their parameters and the values associated with each parameter) applied by a particular command-line. Dec 29, 2023 · ffmpeg -i input -vf scale=iw/2:-1 output FFmpeg assumes the option names in the order they are declared in the source code. and set color range for the encoder and the container*, -color_range 2, *if writing to MP4, also add -movflags +write_colr. 横幅が1280ピクセル未満はリサイズせずに、超えたら横幅1280ピクセルをアスペクト比に合わせて縦幅をリサイズする Sep 19, 2021 · Hy although this is an old thread, this is my solution:-vf scale_vaapi=-2:720 "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. mp4 -vf "subtitles=subs. This allows you to do more complex . 1 Simple filtergraphs. 6 * FFmpeg is free software; you can redistribute it and/or. mp4 -vf scale=2000:100,setsar=1 2. the scale filter defaults to 601, so in the absence of color metadata, 601 is assumed. uchl, used_chlayout. avi -filter:v "crop=1280:670" output_video. However, I'm on Windows and invoking ffmpeg via Python, so I'd like to do it all within the filter_complex clause. Specify the Height To Retain the Aspect Ratio. The parameters for the noise reduction filter are Sep 20, 2021 · Hmm, it seems it's still not quite what I was looking for. The resulting video will have a resolution of 1280x720. Jun 9, 2024 · If you need to simply resize your video to a specific size (e. The resulting image will look like this: Sep 2, 2021 · 3. If your input has more than 20 fps, then ffmpeg will drop frames to convert to 20 fps. png -filter_complex "[0]scale=iw-300:-2[vid],[vid]pad=iw+300:ih[padvid],[padvid][1]overlay=x=W-w:y=0" -c:v h264 -c:a copy o. mp4 -vf scale=1280:-1 output. ' read, ignoring remaining -vf options: Use ',' to separate filters even though no other vf present Apr 28, 2023 · Upscaling a video and applying noise reduction: ffmpeg -i input. filter() takes the upstream node followed by the name of the filter, followed by the configuration Jul 11, 2020 · Use the scale filter with animation, available since v4. But please explain how to control the different values. Mar 17, 2023 · I would like not to use reverse but actual values in order to have full control over the reverse rotation/scale durations and timings. How to use filter_complex to apply filters to videos. mp4 -vf "fps=20,scale=1920:1080" 240_scaled/out%d. 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() function defined in libavfilter 5. ffmpeg -y -i input. avi However, it says: "Too many inputs specified for Feb 23, 2019 · ffmpeg -i input -vf scale=1280:-2 -sws_flags lanczos+accurate_rnd output. If you want all of the frames as is Oct 6, 2018 · ffmpeg -i test. -aspect[:stream_specifier] aspect (output,per-stream) Set the video display aspect ratio specified by We would like to show you a description here but the site won’t allow us. Default (-s 1280×720) Cascade using fast bilinear. As with the crop filter, to resize a video you use the FFmpeg scale filter, with a combination of options. May 29, 2022 · I'm on a computer with an Intel 11th gen i5-1135G7, which I know supports the QSV encoders. -filter_complex. For full video encoding (slow command, does encoding): ffmpeg -i inputFile -vf "transpose=1" -c:a copy. 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. However with this commando FFmpeg complains that -filter_complex and -vf can not be used in the same commando. mkv -vf bwdif=1:0:0,zscale=w=-1:h=720:f=spline36:r=full -c:v libx264 -preset slow -crf 23 -tune animation -movflags +faststart -c:a copy output. The values in scale and pad are derived dynamically and correspond to the video height and video width. scale with that width: 3. Aug 15, 2014 · In the filter chain, you must first scale the image separately, and then perform the overlay. ffmpeg -i INPUT -c:v copy -bsf:v filter1[=opt1=str1:opt2=str2][,filter2] OUTPUT. force_style uses the SubStation Alpha (ASS) style fields May 10, 2024 · Pixel format conversion is often performed by libswscale, which you will most likely access through the FFmpeg Scaler or the scale video filter. This stream base_object has two properties, # audio and video . I have a command that selects the three streams and copies 1 minute to the output, as follows: Sep 15, 2021 · Only '-vf scale. However, not everything that's possible is also useful. pad. Mar 6, 2019 · ffmpeg -i in. mp4 -filter:v "scale=w:h" output. This is the command I am trying to execute from the command line: ffmpeg -i input. That's why ffmpeg resticts using -filter_complex in combination with -vf and/or -af. -2 in the scale video filter is used instead of -1 because x264 requires the output to be divisible by 2 when outputting to 4:2:0 chroma subsampling: If one of the values is -n with n > 1, the scale filter will also use a value that maintains the aspect ratio of the input image, calculated from the other specified dimension. Cascade using Lanczos; Video filter using Lanczos (-vf scale=1280×720 -sws_flags lanczos) Jan 28, 2024 · (Note that the scale_vaapi filter is required here to copy the frames - without it, the subtitles would be drawn directly on the reference frames being used by the decoder at the same time. Aug 2, 2018 · 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 finally concat the result into one video file. For example, a zmq message can be sent to the "scale" filter to change the size of a video stream. mp4 Dec 8, 2014 · In the above I'm using FFmpeg's video filter (-vf), setting the scale to the current input width and height (scale=iw:ih), setting the sample/pixel aspect ratio (sar) to 1, and setting the display aspect ratio (dar) to the same with and height (setdar=dar=w/h). 264; How to use filter_complex to apply filters to videos; How to download m3u8 steam and save to mp4; How to list supported pixel formats; How to reduce background audio noise using arnndn (neural network models) How to reduce background audio noise using afftdn; How to delay (sync with video) audio Jun 13, 2020 · I am using the following ffmpeg command with filter_complex: ffmpeg -i GOPR0013. How to convert AV1 to H. This command will resize all . jpg images in the folder, sets the width 480 while keeping ratio, and add "Small-" at the start of the resized image name. mp4 -vf "scale=1280:-1" resized_video1. , no copy) the process will be much slower (x100 time slower or even more). Jul 15, 2023 · I very often find myself changing the height of the colored background and I wish that there's some way for scale in filter_complex to reference the height of the colored background, so that I don't need to change the height in two places. Here's something to get you started. mp4 Hello Besides cropping part of the screen, I also need to resize the whole screen, but vf and filter_complex are mutually exclusive: ===== ffmpeg -i input. Sep 10, 2021 · 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 More of Ffmpeg. ffmpeg permits to set the dimension of a video to -1 in order to preserve aspect ratio. This sets the width of the video as 1280 and then will automatically calculate the height keeping with the ratio of the input video. Chains are separated by ;. jpg) do ffmpeg -i "%j" -vf scale=480:-1 "Small-%~nj. video # ffmpeg. There is a chance that your FFmpeg version has no scale_qsv filter. -pix_fmt yuvj420p and same measures as above for encoder + container. mp4 -vf "scale=960:-1" output_960. Below is a description of the currently available bitstream filters, with their parameters, if any. And I think for some types, it may be necessary to use -2 instead of -1. Source: Aug 28, 2012 · You don't need to use vf scale. Set used input channel layout. jpg -b:v 1M \. h API for programmatic use. Feb 13, 2019 · Use the scale filter, -vf scale=in_range=limited:out_range=full. Jun 1, 2017 · I've found out that yes, ffmpeg applies the filters in the order specified; thus it's not a good idea to e. Filters sit between the input and the output and Jul 26, 2023 · FFmpeg simplifies this process by offering different resizing options. Mar 29, 2018 · 8. But this command, which only involves upscaling and with only 1 video works: ffmpeg -c:v h264_cuvid -i "Input1. Apr 17, 2020 · 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 backgroundimage. It's possible to send zmq messages to all options of all filters. ffmpeg -filters | grep scale2ref. ffmpeg -i output. m4v 2 days ago · As an output option, this inserts the scale video filter to the end of the corresponding filtergraph. Other video filters include: colormatrix colorspace zscale (z. [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. [v0][0:a][v1][1:a]concat=n=2:v=1:a=1[v][a]" -map [v] -map [a] output. After that it will, however, make sure that the calculated dimension is divisible by n and adjust the value if necessary. Since the FFmpeg transpose command is very slow, use the command below to rotate a video by 90 degrees clockwise. Several chained filters form a filter graph. It will scale the input image to fit the width and/or height of the desired output format without distorting the image. mp4 Now I want to do the same, but with Nvidia CUDA. Simple filtergraphs are those that have exactly one input and output, both of the same type. MP4 -filter_complex "[0:v:0]fps=32,scale=1920:1080[v1],[v1]vflip[vF1],[vF1]hflip[clip1], [clip1] [1:v:0]fps=32,scale=1920:1080[v2] [v2] concat=n=2:v=1 [v]" -vcodec libx264 -map "[v]" video_out_01. 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. A filter with no input pads is called a "source", and a filter with no output pads is called a "sink". The format is ‘wxh’ (default - same as source). MP4 -filter_complex "[1]scale=1612:906[inner]overlay=154:170:shortest=1[out]" -map "[out]" -map 1:a -c:a copy -y -b:v 2000k Mar 18, 2024 · If any value for either width or height is less than 0, the scale filter from FFmpeg uses a value that maintains the original aspect ratio based on the other parameter: $ ffmpeg -i cropped_video. the value of 1 for those color options signifies 709, which is why ffprobe returns that readout. - ffmpeg -t option can now be used for inputs, to limit the duration of data read from an input file - incomplete Voxware MetaSound decoder - read EXIF metadata from JPEG - DVB teletext decoder - phase filter ported from libmpcodecs - w3fdif filter - Opus support in Matroska - FFV1 version 1. Actually -vf and -af serve the same purpose as -filter_complex, but in simplest manner. Jul 19, 2012 · 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 into static sized player . In this command, -1 indicates the automatic calculation of height to maintain the original aspect ratio. Using the argument -vf “scale=-2:720”, FFmpeg resizes the video to a width of 720 pixels while automatically Options may be set by specifying -option value in the FFmpeg tools, option=value for the aresample filter, by setting the value explicitly in the SwrContext options or using the libavutil/opt. mp4 -i /overlay. my_vid_stream = mystream. Nov 28, 2018 · So it is not possible to filter and stream copy the same stream at the same time. Oct 19, 2020 · I'm trying to scale a video, and then apply an overlay keeping the aspect ration of the same. THanks but the overlay filter in your command wont work with text based subtitles. 2 videos, in and out. MP4 -i GOPR0013. ts" -i img. May 22, 2022 · [AVFilterGraph @ 0x565389e2a780] Too many inputs specified for the "scale_cuda" filter. Oct 17, 2013 · What you need to do is to first scale and then pipe that video output into the concat filter like so: ffmpeg -i input1. Filters sit between the input and the output and make some change to Mar 18, 2015 · The first filter is the scale filter. png -vf scale=3840:2160 -sws_flags lanczos out. mp4. I have done something like this : ffmpeg. mp4 -i in. 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. JPG" -filter_complex "\ [0:v]crop=3300:3300,scale=900:900[vid]; \ [0:v]crop=3300:3300,scale=900:900,reverse[r]; \ [vid][r]concat,loop=2:80,setpts=N/13 There are tools available. You can chain linear filters together with commas: ffmpeg -i 240_video. png -filter_complex "overlay=0:0" output. And I use next command: ffmpeg -i /video1. mp4 ctrl + c. mp4 -acodec copy -vcodec mpeg4 -s 360x240 -aspect 4:3 out. I have a 320x240 file that I want to convert to 360x240 with black bands on the side. If the input image format is different from the format requested by the next filter, the scale filter will Aug 28, 2016 · See scale and overlay filter documentation for more info. Some answers I've looked at: Nov 29, 2022 · Today we are dealing with the filter_complex flag, allowing you to deal with multiple inputs and produce multiple outputs. Set the output video dimension expression. like this: -vf "scale=1920:1080 , subtitles=subtitles. Default value is the input dimension. Dec 3, 2022 · Notes: Since we're using hstack, we must scale the input video so that its height is the same as the showcqt output height (900). I would like to refrain from first scaling down the images or creating video files from them and then overlay these videos. 0:1. 2. Lexard. 5. b) scale with given width, keep aspect ratio, but make height divisible by 2 (required by many pixel formats): ffmpeg -i input_movie -vf scale=width:-2 output_movie. Hey folks. Reply. 4 * This file is part of FFmpeg. The scale filter forces the output display aspect ratio to be the same of the input, by changing the output sample aspect ratio. 7. This is because 1080 / 720 = 1. Filtergraph, Chain, Filter relationship Oct 25, 2015 · You have two main options to make it fit after using scale: pad or crop. Apr 11, 2021 · A suggestion on how to approach upscaling them that I got from Reddit was to do something like this: ffmpeg -vf "scale=iw*6:ih*6:flags=neighbor,scale=1966:-2" 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 Mar 2, 2015 · for %j in (*. mp4 -vf scale=-1:720 output. You can add -c:a copy if you want to stream copy (re-mux) the original audio instead of re-encoding it. e. If the input is truly 601, then you don't need to add anything in scale. When you have multiple inputs or you need to apply multiple filters, you can use filter_complex. 1 Filtergraph syntax. I would like to be able to change the scale of a video over time by using an expression (like, scale=w=iw*t, or something along that line). The 2 in -2 makes sure the width is divisible by 2 - see FFmpeg's scale options: width, w. mp4 That's it. 5 = 1280 pixels. In this case, the math computes the new scaled width and height. 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. Execute ffmpeg -h filter=scale_qsv, and verify the output is QuickSync video scaling and format conversion. mp4-filter_complex can be used to combine many filters together. Generate one short video procedurally, and then convert it to 3 different sizes. 2 Win64 Static and am having trouble using the zscale filter. Take a look at these examples and the documentation for each filter. mp4 Mar 18, 2019 · 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. Jul 18, 2022 · I currently have two filters that work great when used individually: ffmpeg -i "D:\imageSequences\A. See the ffmpeg documentation for more info. Apr 21, 2022 · FFmpeg documentation - filters; FFmpeg documentation - scale_cuda-vf "scale_cuda=-2:480" scales to a 480px height and a width calculated to keep the aspect ratio. hardsub subtitles first and then apply sharpening filter, e. (don't remember if it's -2 or -1) It will scale for example a 1080p to 720p without the height, it will caculate automatically the good height from the width and keep the aspect ratio. Since* 0. mp4 -i logo. a) scale with given width and keep aspect ratio. 8. This will pillarbox the image. mp4 -c:v libx264 -vf scale=640:-1 -pix_fmt yuv420p Jul 1, 2015 · The closest question I've come across is Scale watermark overlay by video size with ffmpeg but that answer uses external Linux/Cygwin commands. ass , unsharp=3. This command uses the Lanczos scaling algorithm to upscale a video to 1080p and then applies a noise reduction filter to reduce the impact of noise. 3. ffmpeg_encoder_init_frame and ffmpeg_encoder_scale are the key methods. Is this possible? when I run that expression through -filter_complex, I get Feb 21, 2020 · Resize the video. png -filter_complex "[1]scale=50:50[in2];[0][in2]overlay" out. lib library) Comparing and contrasting colorspace, colormatrix, libswscale, and zscale To enable compilation of this filter, you need to configure FFmpeg with --enable-libzimg. mkv -filter_complex scale=720:480 output. Use the SAR filter to reset the SAR after scaling. mp4 Apr 20, 2024 · We’ll use the ‘scale’ filter to resize videos to any desired dimension. mp4 -c:v libx264 -crf 31 -me_method umh -bf 0 -vf scale=480:-2 out. mp4 -i image. -t 8 -i image2. 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. I have a working command, but its very slow. Just give -s widthxheight and it will scale to that size. mp4 -c copy -metadata:s:v:0 rotate=270 output. jpg". avi -vf scale=320:240 output. Mar 28, 2020 · 15. Fast command (without encoding): ffmpeg -i input. Thus, the width is scaled to 1920 / 1. The asplit filter is used to duplicate the audio stream. Input is full range 4:2:2, I want to output in 4:2:0 full range. Lanczos can use additional parameter here: param0 is defined as "the width (alpha)", its default value is 3. mp4 -filter_complex \. ffmpeg -i input_movie -vf scale=width:-1 output_movie. 知乎专栏提供随心写作与自由表达的平台，让用户分享知识和观点。 Oct 19, 2020 · FFMPEG filter_complex wih speedup and subtitles and scaling 0 Only '-vf scale. 8 * License as published by the Free Software Foundation; either. Lanczos can use additional parameter here: param_a is defined as "the number of filter taps", I 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 the name of the filter. 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. 0:3. ts The scale filter will adjust the sample aspect ratio to maintain the original display aspect ratio, which is 16:9 for your input. ffmpeg -i video. The resulting image will look like this: Dec 18, 2019 · Within a chain of filters (separated by ,), labels are not necessary. avi. If you want to scale a video to a custom width but keep the ratio you can input -1 after the width: ffmpeg -i input. So I rewrite my command to: May 2, 2019 · 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. If your input has less than 20 fps, then ffmpeg will duplicate frames to convert to 20 fps. This example resizes given image to 50x50 and places it (overlays) over given video: ffmpeg -i in. If I didn't define all 3 values it would only display correctly in some software. g 320x240), you can use the scale filter in its most basic form: ffmpeg -i input. 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. Basically, can the rotate and scale filters print their values, per frame? Zoompan answers are valid. How to scale down preserving the aspect ratio. ' read, ignoring remaining -vf options: Use ',' to separate filters even though no other vf present 0 Invalid command with ffmpeg filter syntax with scaling, concat and xstack Jul 3, 2014 · Video copy will ignore the video filter chain of ffmpeg, so no scaling is available (man ffmpeg is a great source of information that you will not find on Google). srt:force_style='Fontsize=24,PrimaryColour=&H0000ff&'" -c:a copy output. Please use the scale filter directly to insert it at the beginning or some other place. I've seen maybe a dozen different answers using scale2ref, but no explanations as to actually what's happening, so I'm finding it difficult to know how to implement/make changes to the configs to work for my situation. mkv" -c:v h264_nvenc -filter_complex "hwupload_cuda,scale_cuda=w=1920:h=1080:format=yuv420p:interp_algo=lanczos,hwdownload,format=yuv420p" "output Dec 12, 2022 · 2. 3 is stable and no longer experimental - FFV1: YUVA Before encoding, ffmpeg can process raw audio and video frames using filters from the libavfilter library. #. The scale filter is powerful because it can perform value substitution and math. jl wf gd ut ek cx yd sb fz ok