ffmpeg_opt: Compensate for DTS/PTS difference in seeking when its bas…

…ed on DTS Fixes Ticket4554 Signed-off-by: Michael Niedermayer <[email protected]>
zhengxj91 · May 18, 2015 · b0322e4 · b0322e4
1 parent b012bd5
commit b0322e4
Showing 1 changed file with 14 additions and 1 deletion.
diff --git a/ffmpeg_opt.c b/ffmpeg_opt.c
@@ -927,7 +927,20 @@ static int open_input_file(OptionsContext *o, const char *filename)
 
  /* if seeking requested, we execute it */
  if (o->start_time != AV_NOPTS_VALUE) {
- ret = avformat_seek_file(ic, -1, INT64_MIN, timestamp, timestamp, 0);
+ int64_t seek_timestamp = timestamp;
+
+ if (!(ic->iformat->flags & AVFMT_SEEK_TO_PTS)) {
+ int dts_heuristic = 0;
+ for (i=0; i<ic->nb_streams; i++) {
+ AVCodecContext *avctx = ic->streams[i]->codec;
+ if (avctx->has_b_frames)
+ dts_heuristic = 1;
+ }
+ if (dts_heuristic) {
+ seek_timestamp -= 3*AV_TIME_BASE / 23;
+ }
+ }
+ ret = avformat_seek_file(ic, -1, INT64_MIN, seek_timestamp, seek_timestamp, 0);
  if (ret < 0) {
  av_log(NULL, AV_LOG_WARNING, "%s: could not seek to position %0.3f\n",
  filename, (double)timestamp / AV_TIME_BASE);