Actually the term "video stream level" is quite possibly more accurate as to what mp4box (and yamb) does for the PAR than the term "container level" I've seen mentioned in a few places including the videohelp link I posted;
YES, when I tried mp4box, I did specify the video stream on the commandline. Nonetheless, it applied the change almost instantly, indicating it was not changed THROUGHOUT the videostream -- I suppose that would be at the "SPS level" that the ffmpeg fork tries to address.
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