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anamorphic resize is done exactly the same way in mp4 as in avi, meaning its stored in the bitstream and not in the container
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Why MP4Box has a par switch then?
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do you really support DISPLAY AR or more PIXEL AR?
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PAR for MP4Box but only when no resize filter is used (assuming a resize filter uses the %target_width% macro)
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btw the one and only right expression for pixel aspect ratio in avc is "SAR" (sample aspect ratio). the avc standard also doesnt know "display aspect ratio", meaning dar has to be recalculated to the correct sar, but you propably know that already
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So SAR is basically the same as PAR, I feel somehow relieved now because this stuff started to bother me.