Is there also a way to add black bars to the output file? If I set my output file resolution at 640x480, but my input file is 16:9, the output will be 640x480 but with the video NOT stretched to the edges...rather with black bars (letterboxing) on the top and bottom?
Do you need Libavfilter for this? or can ffmpeg do this on its own? Do you know the command lines to accomplish this? Any info is of course greatly appreciated. Al On Thu, Feb 25, 2010 at 9:55 AM, slippyr4 <[email protected]> wrote: > > > > > > If that can't work, I am trying to figure out how to not distort the > aspect > > ratio of the source video. If my source video is 16:9, and I encode it to > a > > preset that is 4:3, I want it to letterbox the video (place black bars on > > top and bottom). I don't want it to stretch the video to the edges so > that > > everyone looks twice as tall. > > > > i know nothing about winff, but you can scale maintaining aspect ratio > specifying only one dimension with the scale filter in libavfilter. This is > not integrated into the main repo yet, so you would need to build your own > ffmpeg (or find a win32 binary) with libavfilter support to get that to > work. > > i would guess the reason that main ffmpeg doesn't do what you want is that > not all pixels are square - therefore picture aspect ratio is not the same > as width/height. That's why libav* maintain aspect ratio and frame size > quite separately. > > jon > _______________________________________________ > libav-user mailing list > [email protected] > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
