+
+bool
+FFmpegDecoder::decode_video_packet ()
+{
+ int frame_finished;
+ if (avcodec_decode_video2 (_video_codec_context, _frame, &frame_finished, &_packet) < 0 || !frame_finished) {
+ return false;
+ }
+
+ boost::mutex::scoped_lock lm (_filter_graphs_mutex);
+
+ shared_ptr<FilterGraph> graph;
+
+ list<shared_ptr<FilterGraph> >::iterator i = _filter_graphs.begin();
+ while (i != _filter_graphs.end() && !(*i)->can_process (libdcp::Size (_frame->width, _frame->height), (AVPixelFormat) _frame->format)) {
+ ++i;
+ }
+
+ if (i == _filter_graphs.end ()) {
+ shared_ptr<const Film> film = _film.lock ();
+ assert (film);
+
+ graph.reset (new FilterGraph (_ffmpeg_content, libdcp::Size (_frame->width, _frame->height), (AVPixelFormat) _frame->format));
+ _filter_graphs.push_back (graph);
+
+ film->log()->log (String::compose (N_("New graph for %1x%2, pixel format %3"), _frame->width, _frame->height, _frame->format));
+ } else {
+ graph = *i;
+ }
+
+ list<shared_ptr<Image> > images = graph->process (_frame);
+
+ string post_process = Filter::ffmpeg_strings (_ffmpeg_content->filters()).second;
+
+ for (list<shared_ptr<Image> >::iterator i = images.begin(); i != images.end(); ++i) {
+
+ shared_ptr<Image> image = *i;
+ if (!post_process.empty ()) {
+ image = image->post_process (post_process, true);
+ }
+
+ int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
+ if (bet != AV_NOPTS_VALUE) {
+ /* XXX: may need to insert extra frames / remove frames here ...
+ (as per old Matcher)
+ */
+ Time const t = bet * av_q2d (_format_context->streams[_video_stream]->time_base) * TIME_HZ;
+ video (image, false, t);
+ } else {
+ shared_ptr<const Film> film = _film.lock ();
+ assert (film);
+ film->log()->log ("Dropping frame without PTS");
+ }
+ }
+
+ return true;
+}
+
+Time
+FFmpegDecoder::next () const
+{
+ if (_decode_video && _decode_audio) {
+ return min (_next_video, _next_audio);
+ }
+
+ if (_decode_audio) {
+ return _next_audio;
+ }
+
+ return _next_video;
+}