However, I've now run into a case that it does not work correctly, and I suspect it has something to do with SAR and DAR. ffmpeg -i in -vf scale=ih*4/3:ih,setsar=1 -c:a copy out.mp4 Most processing filters in FFmpeg handle the aspect ratio to avoid stretching the image: cropping adjusts the DAR to keep the SAR constant, scaling adjusts the SAR to keep the DAR constant. ffmpeg -i input.mp4 -vf scale=480:-1 output.mp4 Here, your resized video will have a resolution of 480 x 320. How to Change Aspect Ratio of MP4 Video Without Re Encode … To install ffmpeg: 1. sudo apt install ffmpeg. FFmpeg uses a scale filter in resizing. So, to obtain a given DAR, say 4/3, you have to calculate the appropriate SAR. 1. If you want to change the aspect ratio, you need to change the command again. In order to convert the 4:3 videos I tried the following: ffmpeg -i input.avi -vcodec dvvideo -croptop 88 -cropbottom 88 -s 720x576. ffmpeg -i input.mp4 -vf "scale=480:320",setdar=4:3 output_320.mp4. Then, I asked it to scale the video back to the standard 1920x1080 resolution, using the display aspect ratio of 16:9; this ensured square pixels. Maintain aspect ratio in ffmpeg conversion [#383100] | Drupal.org FFmpeg crop example: crop the 100x100 pixels top right section of a video. The framerate is set to 12fps with -framerate. If I will run ffmpeg with -s 100x200, then second video will have bad aspect ratio. Aspect ratio change in the middle of a video stream - FFmpeg If you want to stretch, or “unstretch”, the image, you need to override the information with the setdar or setsar filters . FFmpeg can be used to cahnge the resolution and aspect ratio of images and videos. ffmpeg - Convert a video to a fixed screen size by cropping and ... The ffmpeg command to do this conversion will be: To maintain the height - -vf scale=hhh*a:hhh. ffmpeg -i aspect_ratio_change.ts -vf fps=1,scale=h=ih:w=sar*iw out_%3d.jpeg The first image (before the aspect ratio change) has 768x576 [SAR 1:1 DAR 4:3] which is perfect! # For video input $ ffmpeg -i input.mp4 -vf scale=640:480 output.mp4 # For image $ ffmpeg -i input.jpeg -vf scale=640:480 output. 2. joparis fragte: vor 3 Jahren anzahl der aufrufe: 501. change Aspect Ratio in ffmpeg, but keep two audio streams & subtitles. sample_aspect_ratio=3/4 Remember, these modify the sample (pixel) aspect ratio. [Ffmpeg-user] Aspect ratio conversion 4:3 to 16:9 - narkive 2. ffmpeg -i input.mp4 -vf "scale=480:320" output_320.mp4. [libx264 @ 0x2f08120] height not divisible by 2 (640x853). So I changed mm_ffmpeg.module to match what I need.