-void
-FFmpegDecoder::out_with_sync ()
-{
- /* Where we are in the output, in seconds */
- double const out_pts_seconds = video_frame() / frames_per_second();
-
- /* Where we are in the source, in seconds */
- double const source_pts_seconds = av_q2d (_format_context->streams[_packet.stream_index]->time_base)
- * av_frame_get_best_effort_timestamp(_frame);
-
- _film->log()->log (
- String::compose (N_("Source video frame ready; source at %1, output at %2"), source_pts_seconds, out_pts_seconds),
- Log::VERBOSE
- );
-
- if (!_first_video) {
- _first_video = source_pts_seconds;
- }
-
- /* Difference between where we are and where we should be */
- double const delta = source_pts_seconds - _first_video.get() - out_pts_seconds;
- double const one_frame = 1 / frames_per_second();
-
- /* Insert frames if required to get out_pts_seconds up to pts_seconds */
- if (delta > one_frame) {
- int const extra = rint (delta / one_frame);
- for (int i = 0; i < extra; ++i) {
- /* XXX: timestamp is wrong */
- repeat_last_video (source_pts_seconds);
- _film->log()->log (
- String::compose (
- N_("Extra video frame inserted at %1s; source frame %2, source PTS %3 (at %4 fps)"),
- out_pts_seconds, video_frame(), source_pts_seconds, frames_per_second()
- )
- );
- }
- }
-
- if (delta > -one_frame) {
- /* Process this frame */
- filter_and_emit_video (_frame);
- } else {
- /* Otherwise we are omitting a frame to keep things right */
- _film->log()->log (String::compose (N_("Frame removed at %1s"), out_pts_seconds));
- }
-}
-