Ffmpeg Change Aspect Ratio, If anything I've done above is wrong let me know please, because I don't want the frame rate or aspect ratio to end up messed up. Specify the desired aspect ratio by setting the width and height values, and ffmpeg Is there a way to change the aspect ratio while I'm transcoding, I don't want to do it at the container level, I want it on the actual video. (eg. mkv -aspect 221:100 -c copy output. mov -vf scale=720x406,setsar=1:1 output. sar rational number (encoding,video) Set sample aspect ratio. Thank you very much for reading. $ ffmpeg -i <input-file> -vf scale=<width>:<height> <output-file> For example. 5 will display as a 375x125 video. Possible values: ‘ pict ’ picture info ‘ rc ’ rate control ‘ bitstream ’ ‘ mb_type ’ macroblock (MB) type It shows how to scale with aspect-ratio preservation, crop specific regions, overlay images with position expressions, change playback speed (video and audio), apply blur and eq filters, rotate, and chain multiple filters. Alias to aspect. mp4 As I am fixing the size of the screen to -s 720x400, if the aspect ratio of the original is 4:3, FFmpeg creates a 16:9 output file, screwing up the aspect ratio. ffmpeg How to change video resolution and keep aspect ratio In order to keep aspect ratio, set only one target dimension (width or height) and leave the other one as -1: What's the proper command syntax to change frame size/aspect ratio using ffmpeg? Ask Question Asked 12 years ago Modified 11 years, 9 months ago The sample aspect ratio is the effective ratio of the display width of a pixel to its height, so a 150x125 stored video with a sample aspect ratio of 2. mov -vf scale=320:-1 output. 8 "output. mp4" -aspect 4:3 "output. mp4" -aspect 1. change from 16:9 to 4:3 or vice versa) Apr 7, 2018 · This can be corrected by changing the aspect ratio in VLC from 16:9 to 4:3, but how can the original video be remuxed or reencoded so that it is restored to its correct and original shape? Oct 21, 2020 · I would like to change the aspect ratio of a video file so that I can play it on my tv without it being distorted. Dec 21, 2015 · To maintain the aspect ration, you can specify just the width, followed by -1 which will calculate the height to maintain the aspect ratio of the input: ffmpeg -i input. -1 can also be used for width if you provide a given height. Changing the aspect ratio at constant resolution using ffmpeg Created: 27 August 2019 Change the aspect ratio of a video file with ffmpeg: ffmpeg -i input. mkv This results in a video with characteristics like the following: Stream #0:0: Video: hevc (Main 10), yuv420p10le (tv, bt709), 1920x922 [SAR 1:1 DAR 960:461], SAR 52:49 DAR 49920:22589, 23. Apr 7, 2021 · ffmpeg -i "input. May 1, 2016 · could an expert help me change the aspect ratio of original mp4 video to 16:9 using ffmpeg (without losing video quality) for re uploading to YouTube? Thanks in advance ? So if you want to stretch the movie anamorphically to a new aspect ratio you need to manually set the pixel aspect ratio, called the SAR for "Sample Aspect Ratio", thus for square pixels use: ffmpeg -i input. I read through a bit of the thread a linked to and it appears the ffmpeg build can still accept "-aspect x:y" or "-aspect X" in the commandline to change the container aspect ratio along with a SAR to change the bitstram aspect ratio. Dec 2, 2020 · Learn how to change the resolution, resize, or scale a video using FFmpeg's command-line tool including tips on retaining the aspect ratio and video quality. Scaling filter provided by FFmpeg can be used for doing that. exe -i video. 98 fps, 23. 98 tbr, 1k tbn, 23. This guide provides step-by-step instructions and examples to help you adjust video dimensions while maintaining quality. avi and press intro. Jan 15, 2025 · To change the aspect ratio of a video file using ffmpeg, you can use the command line with the "scale" filter. Dec 15, 2014 · When you have the command line opened you must to go to the ffmpeg/bin folder and start to write your instruction. If you need to simply resize your video to a specific size (e. for example: c:\ffmpeg\bin\ffmpeg. mkv The -1 will tell ffmpeg to automatically choose the correct height in relation to the provided width to preserve the aspect ratio. FFmpeg is an essential tool for video processing, providing robust features for scaling and adjusting the aspect ratio of video files. aspect rational number (encoding,video) Set sample aspect ratio. OP mentions "change the aspect ratio" (but this is directly linked to the resolution including letter-boxing, etc). mp4" In the past, this next command did change the aspect ratio on a video I was trying to (only slightly) correct from 16:10 to 16:9 or something like that, but on my current 1920 x 1080 file this also does nothing, it just comes out looking exactly the same: ffmpeg -i "input. avi -filter:v scale=720:-1 -c:a copy output. Aug 27, 2019 · Support my research and science communication efforts through Patreon. It's not clear if this means to actually change the aspect ratio or alter the frame's size (the former would require letter-boxing). I have already succeeded in FFmpeg can be used to cahnge the resolution and aspect ratio of images and videos. debug flags (decoding/encoding,audio,video,subtitles) Print specific debug info. mp4 Alternatively you can set the display aspect ratio to whatever you want, thus: Aug 6, 2024 · Learn how to efficiently scale and resize videos using FFmpeg. 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. 98 tbc (default) 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). avi -vcodec h264 -s 720x576 -aspect 16:9 -acodec mp3liblame -b 1536k output. This guide provides the simple command to change a video's resolution while showing you how to maintain the aspect ratio. mp4" If you want to fix only aspect ratio, you can use pazera flv to avi (what is using ffmpeg), there you can select aspect ratio & etc and convert it :) (It supports all videos, just drag&drop files to window) Apr 21, 2022 · Using the scale filter will provide more flexibility: ffmpeg -i input. Is there a setting that allows setting an aspect ratio as the main parameter, with size being adjusted (for example, by fixing an X or Y dimension only)? Learn how to convert videos to various resolutions using FFmpeg for bandwidth optimization and video quality improvements. Apr 30, 2015 · Changing the aspect worked straight away! You can't use -c copy and scale at the same time; however you can use -aspect to change the aspect ratio at the container level (but not the stream level). Learn how to convert videos to various resolutions using FFmpeg for bandwidth optimization and video quality improvements. Oct 22, 2025 · Change Video Aspect Ratio with FFmpeg How to fix an incorrect video aspect ratio using the FFmpeg command-line tool. . Apr 30, 2015 · When you use -par stream-number=width:height, you define the pixel aspect ratio – that is, the result of dividing the device aspect ratio by the storage aspect ratio. If I didn't define all 3 values it would only display correctly in some software. Oct 16, 2025 · Resize and scale videos effortlessly with FFmpeg. d4hi, tvyx, wkoln, jgt1, fce4g, m3of, r438mb, bkfaq, stzk, 5aeol,