I have been creating mkv output of PAL VHS 720x576 resolution videos.
These videos then display as 768x576 in a PC media player, and Oppo Blu-ray, due to the 4:3 aspect ratio flag. So all well and good.
But some editing programs will produce an output that does not display as 4:3 in a media player.
See here, a 10 second snip created with mkvmerge, displays as 4:3. And another created with AviDemux, this one defaults to it's native display of 5:4 instead of 4:3.
What is the difference that causes this? I cannot see any difference in mediainfo of both these files that would cause both MPC and Oppo Blu-ray to ignore the 4:3 stretch in the AviDemux version?
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Yes, the DAR 4:3 flag seems to be missing in the avidemux container and the SAR signalling (16:15) of the video stream is ignored. Surprisingly though MediaInfo reports it nevertheless as DisplayAspectRation 4:3.
Easiest way to fix it would be just to remux the avidemux with mkvmerge and set the DAR correctly, or to force the playback manually as 4:3 on the player.