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Old 22nd March 2011, 04:06   #8  |  Link
eathasa
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Join Date: May 2006
Posts: 14
I got the understanding that mp4box (and yamb) change the PAR at the container level from the following 2009 discussion thread: http://forum.videohelp.com/threads/3...ut-re-encoding -- at least two posters made that statement.

My experience seemed to reinforce that understanding: I used a March 2, 2011 Kurtnoise compile of mp4box (v0.4.6-DEV-rev2735), and changing the PAR on my mp4 worked only if the mp4 was play in VLC, but not in any other player. Also, it applied the change almost instantly, whereas the roozhou ffmpeg fork took some time to process the whole file and change all the SPS records, but the resulting file did NOT show the PAR correction in VLC -- it was ONLY corrected in directshow players! (I'm simplifying my results with this ffmpeg, as there were other issues with my results too).

In any case, neither program seemed to correct it and create a fully compatible, fully corrected file. Using them in combination, in either order, did not solve the issues either.
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