[Libav-user] AV_SEEK_FRAME failing for compressed formats like .wmv .mp4

[MUNDHE Ganesh]

Hello all,

I have been trying to decode videos where I need to offset start position.
I have tried to use AV_seek_frame but it works on raw video format (.y4m) but fails on mpeg2 compressed formats.
Generally videos are in mp4 or wmv and I need to write for those directly instead of converting them into .y4m
Here how I'm using it

//When using with time
       double t = 5;//time in seconds
       int64_t timestamp = t * AV_TIME_BASE; //destination time
       AVRational r = av_make_q(1, AV_TIME_BASE);
       if (VideoStreamIndex >= 0) {
              timestamp = av_rescale_q(timestamp, r,
                     fmt_ctx->streams[VideoStreamIndex]->time_base);
       }

       av_seek_frame(fmt_ctx, VideoStreamIndex, timestamp, AVSEEK_FLAG_ANY);
or
if I know the frame no

int frmaeno = 100;
int64_t point = (int64_t(frameno) * pavStream->r_frame_rate.den *  pavStream->time_base.den) / (int64_t(pavStream->r_frame_rate.num) *pavStream->time_base.num);

av_seek_frame(fmt_ctx, VideoStreamIndex, point, 0);




Tried with avformat_seek_file api too but still failing.
Need help here.


Thanks & Warm Regards,
Ganesh MUNDHE






















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