+ ContentTime ct;
+ if (_frame->pts == AV_NOPTS_VALUE && _next_time[stream_index]) {
+ /* In some streams we see not every frame coming through with a timestamp; for those
+ that have AV_NOPTS_VALUE we need to work out the timestamp ourselves. This is
+ particularly noticeable with TrueHD streams (see #1111).
+ */
+ ct = *_next_time[stream_index];
+ } else {
+ ct = ContentTime::from_seconds (
+ av_frame_get_best_effort_timestamp (_frame) *
+ av_q2d ((*stream)->stream (_format_context)->time_base))
+ + _pts_offset;
+ }
+
+ _next_time[stream_index] = ct + ContentTime::from_frames(data->frames(), (*stream)->frame_rate());
+