Past duration %f too large
Non-monotonous DTS in output stream 0:1; previous: 3411, current: 3272; changing to 3411. This may result in
Queue input is backward in time
incorrect timestamps in the output file
dropping frame
dup!
打印位置：
static void do_video_out(AVFormatContext *s,
OutputStream *ost,
AVFrame *next_picture,
double sync_ipts)
{
if (nb_frames > (nb0_frames && ost->last_dropped) + (nb_frames > nb0_frames)) {
if (nb_frames > dts_error_threshold * 30) {
av_log(NULL, AV_LOG_ERROR, "%d frame duplication too large, skipping\n", nb_frames - 1);
nb_frames_drop++;
return;
}
nb_frames_dup += nb_frames - (nb0_frames && ost->last_dropped) - (nb_frames > nb0_frames);
av_log(NULL, AV_LOG_VERBOSE, "*** %d dup!\n", nb_frames - 1);
}
}
"Drop" means it has dropped a frame during encoding.
"Dup" means it has duplicated a frame during encoding.