I've found a significative difference in video playback speed for different 
frame resolution.
Using the DVTB tool, the mpeg4 decode process gives a log line per frame of the 
form

[DVTB-LOG]: dvevmStVidPlay.c: Frame#, 500, Decoded Frame Size(bytes), 14958, 
DecTime(us), 7093

The DecTime values for a vga frame is almost twice the value for a qvga frame.
This is quite reasonable because a larger frame takes a longer time to be 
decoded.
But why does the playback time scale with the decode time?
Please, note that the same issue doesn't occur with a g711 speech file.

Any suggestions?

Happy Xmas
Gabriele

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