I have a C program that is using libav in a video editor. I want to decode
every 24th frame of the video (and nothing else). I wrote a loop which
uses avformat_seek_file() to seek to frame 0, then frame24, then frame 48,
then frame 72, etc. My input file is AVI container with the ffvhuff codec.
The problem is that whenever I seek to frame N, it also decodes the next
12 frames after N (which I don't want). This is slowing things down
by a factor of 12 since I don't need those extra frames. What is the name of
this 'feature'? (so I can search for it in the documentation)? How can I tell
libAV
to only decode frame N when I seek to frame N?
The high-level psuedo-code looks like this
for (int f = 0 ; f < LargeNumber; f+= 24) {
avformat_seek_file(ctx, 0, f, f, f, AVSEEK_FLAG_FRAME, AVSEEK_FLAG_ANY);
av_read_frame(....)
avcodec_decode_video2(....)
}
In the above code, when I look at best_effort_timestamp for the decoded frame,
it will equal the
seek position 'f' only for the first iteration of the loop, then the next
decoded frame has
best_effort_timestamp of 1, then the next is 2, etc. How can I tell libAV to
turn off this
feature?
Thank you all._______________________________________________
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