Various fixes.

1 files changed, 51 insertions, 41 deletions

diff --git a/src/lib/ffmpeg_decoder.cc b/src/lib/ffmpeg_decoder.cc
index f4c7d3d85..c7c96ce68 100644
--- a/src/lib/ffmpeg_decoder.cc
+++ b/src/lib/ffmpeg_decoder.cc
@@ -270,46 +270,10 @@ FFmpegDecoder::pass ()
 				_film->log()->log (String::compose ("Used only %1 bytes of %2 in packet", r, _packet.size));
 			}
 
-			/* 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 ("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) {
-					repeat_last_video ();
-					_film->log()->log (
-						String::compose (
-							"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);
+			if (_opt->decoder_alignment) {
+				out_careful ();
 			} else {
-				/* Otherwise we are omitting a frame to keep things right */
-				_film->log()->log (String::compose ("Frame removed at %1s", out_pts_seconds));
+				filter_and_emit_video (_frame);
 			}
 		}
 
@@ -584,12 +548,13 @@ FFmpegDecoder::filter_and_emit_video (AVFrame* frame)
 	}
 }
 
-void
+bool
 FFmpegDecoder::seek (SourceFrame f)
 {
 	int64_t const t = static_cast<int64_t>(f) / (av_q2d (_format_context->streams[_video_stream]->time_base) * frames_per_second());
-	av_seek_frame (_format_context, _video_stream, t, 0);
+	int const r = av_seek_frame (_format_context, _video_stream, t, 0);
 	avcodec_flush_buffers (_video_codec_context);
+	return r < 0;
 }
 
 shared_ptr<FFmpegAudioStream>
@@ -645,3 +610,48 @@ FFmpegAudioStream::to_string () const
 }
 
 
+void
+FFmpegDecoder::out_careful ()
+{
+	/* 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 ("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) {
+			repeat_last_video ();
+			_film->log()->log (
+				String::compose (
+					"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 ("Frame removed at %1s", out_pts_seconds));
+	}
+}