Henk Schoneveld <[email protected]> added the comment:

Compiled version r25825, a vcodec copy results in
frame=  360 fps=  0 q=-1.0 Lsize=   13563kB time=14.20 bitrate=7824.2kbits/s

but an encode on the same file results in
frame=  357 fps=  6 q=-1.0 Lsize=    3081kB time=14.20 bitrate=1777.5kbits/s
dup=0 drop=1

The time is the same but the amount of frames is not. The resulting file is VFR,
according to mediainfo, and mplayer interprets the file as 50fps
BTW 360 frames at .04 per frame calculates to time=14.40

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