Hi, Does FFmpeg apply the option "-ss/-t" based on container time stamp information, or is it based on bit stream timing information?
I generated a stream with a 60 second start offset using the following command: $ ffmpeg -itsoffset 60 -i input_clip_x264.mp4 -c copy input_clip_x264_offset.mp4 I tried to seek to a particular time in the generated stream using the following: $ ffmpeg -ss 60 -t 10 -i input_clip_x264_offset.mp4 -copyts -filter:v "select=between(t\,60.000\,70.000)" -c:v libx264 offset_extract.mp4 I see that no frames are extracted in the above command. Using ffprobe, I checked that the frame timestamps start from 60 in the clip with offset (input_clip_x264_offset.mp4). So, in theory, this had to work. If I run the above command with "-ss 0", I see that it is able to extract frames. Thus, I wanted to understand how seeking works under the hood in FFmpeg. Thanks! Best Regards, Nitish _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
