I figure I'm doing the math wrong, or misunderstanding how the filters are supposed to operate, or something simple, but my understanding of ffmpeg video filters is basically nothing. How to Cut MKV files with Wondershare UniConverter (originally Wondershare Video Converter Ultimate) Part 3. Top 3 MKV splitters to Cut MKV Files to Smaller Parts Part 2. In 1:1 pixels it measures 720px across, not 640. Youd need a professional video cutter to trim the part out, which ensures the quality intact while cutting an MKV video and getting one whole MKV file without re-encoding at the output. However, the resulting display of the fullscreen video is pillarboxed, yet slightly horizontally stretched. The pixel dimensions are 720x480, the display dimensions are 853x480, and the two MKVs can be successfully merged (after reencoding the widescreen.mkv to the same video codec, but without video filters). I've tried a number of filters to accomplish this, and the closest I was able to get was a slightly wider than expected video, otherwise pillarboxed properly. So I would like to pillarbox the 4:3 video as I encode it, and then hopefully append it to the 16:9 video. What I would like to do is ultimately combine them (mkvmerge widescreen.mkv + fullscreen.mkv) and to do that I need matching display aspect ratios. I have two MKVs, pulled from DVD, that are respectively 16:9 and 4:3. I'm confusing myself over how the video filters work, particularly how they work together, I think.
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