[Ffmpeg-devel] Newbie - How to go to the near frame to specify timestamp? (original) (raw)

qqq qqqq apuntesus
Wed Feb 1 21:46:39 CET 2006

Hi ,

I find that there is no way to know frame count ... or jump to a determinate frame.

I am newbie , i do some test with avcodec and avformat.

Now i can open file , and get one frame picture (the first frame in the file) and save this picture into file.

I want to jump to a determinate timestamp and get the near frame for this timestamp.

I find the function av_seek_frame.

I try to use this function this way :

av_seek_frame(FormatContext , videostream , timestamp , AVSEEK_FLAG_BACKWARD)

But i don't know how to set timestamp , i send to this function the timestamp in seconds but i don't get the result i want. (example if send timestamp 60 and timestamp 420 i get the same picture).

I try to send timestamp this way : timestamp = 60 * AV_TIME_BASE;

But i get the same result (same picture) if i send : timestamp = 60 * AV_TIME_BASE; timestamp = 420 * AV_TIME_BASE;

Any sample code to use av_seek_frame ?

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