[MPlayer-users] Seeks to a wrong position with -ss option in wmv files
Alexander Roalter
alex at roalter.it
Thu Feb 8 15:44:56 CET 2007
Alejandro Vargas wrote:
> 2007/2/8, Morris Beverly <morrisb at avpresentations.com>:
>>> -ss does not start at the exact time given by you. It starts at the
>>> next keyframe after this time.
>>>
>> I would guess that you could transcode it to an avi to get relatively
>> frame accurate start times.
>
> The only way to make -ss to start exactly at the point you given is to
> convert to avi with ALL KEYFRAMES, i.e. -avcopts key=1 or key=0 (I'm
> not sure) or using mjpeg. But the resulting file will be very big.
>
would it not suffice to set keyframes to 24 (i.e. exactly the framerate
of the video), so seeking in seconds-granularity should be possible.
Then there's still plenty of frames free to be compressed better than an
entire frame. IIRC the mpeg stream of a DVD has a keyframe every 15
frames???
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