On 1/8/24 01:46, Andrew Randrianasulu wrote:
Well, here lies the problem for us!
Ffmpeg (command line utility) encodes those files straight away, so for
example VLC displays them correctly. But our software (cinelerra-gg) so far
was not setting st->sample_aspect_ratio so say webm encodes were by default
with wrong Display aspect ratio in both VLC and GNOME filemanager previews.
You can set DAR in ffmpeg to whatever you want.
I hope now (after my patches under testing) we set sample aspect ratio in
both places (codecpar and st) so hopefully libav* based players will
display them correctly out of the box.
Well, I don't know your tools, but MPEG-TSs actually has no SAR setting. It has no PAR setting,
either, but you can set PAR by setting horizontal_size_value & vertical_size_value. I don't know how
to set them without ffmpeg reacting by actually scaling the samples. That's not what you will want.
You want to correct the aspect without scaling. I don't know how to do that.
Perhaps someone else can advise you. I'd sure like to know how to change MPEG
tags.
-- Mark.
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