or if you want to changing the video aspect ratio please use setdar. So you demux it, changes are gone with ffmpeg, but stay with mp4box. FFmpeg FAQ In one case the output video matches the framerate pretty well every time. FFMpeg: scale and then overlay keeping overlay aspect ratio The ffmpeg command to do this conversion will be: ffmpeg -- maintain aspect ratio with fixed height/width. ffmpeg -y -i import.media -aspect 16:9 scale=640x360,pad=640:480:0:60:black outpu... ffmpeg -i input.mp4 -vf "scale=480:320" output_320.mp4. But the second image (after the change) has 768x576 [SAR 4:3 DAR 16:9] which is not what I expected, it should be 1024x576 [SAR 1:1 DAR 16:9]. # For video input $ ffmpeg -i input.mp4 -vf scale=640:480 output.mp4 # For image $ ffmpeg -i input.jpeg -vf scale=640:480 output. This adds the overlay, but it stretches it to the same aspect ratio of the video which is what I'm trying to avoid: ffmpeg -y -i video.mov -i watermark.png -filter_complex "scale=-1:1280:flags=bicubic,overlay=(main_w-overlay_w)/2:main_h-overlay_h" -crf 0 -preset ultrafast -c:v mpeg4 -qscale:v 10 -c:a: copy out.mp4 4:3 with "skinny" people, try adjusting the PAR, but, without re-coding. But, later I got video which aspect is not 4:3, but 16:9 and so on. ffmpeg -i in -vf scale=ih*4/3:ih,setsar=1 -c:a copy out.mp4 You have to manually set the SAR value to 1:1 to make the players display it in the way you want. 4. If you want to change the aspect ratio, you need to change the command again. Change video resolution using ffmpeg - ncona.com Actually, -2 is a better choice since the computed value should even. So I changed mm_ffmpeg.module to match what I need. -aspect 16:9 -acodec copy prova169.avi. First, I cropped the video to 11/12th its original width, centering the crop rectangle horizontally. Hi, My existing MP4 video file has resolution 1920x1080 and aspect ratio 16:9. Found the internet! Resize/Scale/Change Resolution of a Video using FFmpeg Easily As ffmpeg requires to have width/height dividable by 2, and I suppose you want to specify one of the dimensions, this would be the option: FFmpeg - Changer la résolution de la vidéo avec un ratio d'aspect ffmpeg -i input.mp4 -vf "scale=480:320",setdar=4:3 output_320.mp4. If you are trying to fit a bounding box, then using force_original_aspect_ratio as per xmedeko's answer is a good starting point.
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