Detect soft 2:3 pulldown (telecine) files and decode them at 23.976.

DVD rips from NTSC DVDs are sometimes (always?) encoded using
soft 2:3 pulldown.  The video frames are actually 23.976 but
FFmpeg detects them as 29.97.  With the current approach of the video
decoder ignoring most PTSs and assuming a constant frame rate
it is vital that the file contains the number of frames per second
that the detected frame rate predicts.

This fixes large sync errors with NTSC DVD rips (#1790).

1 files changed, 6 insertions, 1 deletions

diff --git a/src/lib/ffmpeg_examiner.h b/src/lib/ffmpeg_examiner.h
index 9ffb8421b..4f5110ca0 100644
--- a/src/lib/ffmpeg_examiner.h
+++ b/src/lib/ffmpeg_examiner.h
@@ -77,6 +77,10 @@ public:
 		return _rotation;
 	}
 
+	bool pulldown () const {
+		return _pulldown;
+	}
+
 #ifdef DCPOMATIC_VARIANT_SWAROOP
 	boost::optional<std::string> id () const {
 		return _id;
@@ -84,7 +88,7 @@ public:
 #endif
 
 private:
-	void video_packet (AVCodecContext *);
+	void video_packet (AVCodecContext *, std::string& temporal_reference);
 	void audio_packet (AVCodecContext *, boost::shared_ptr<FFmpegAudioStream>);
 
 	std::string stream_name (AVStream* s) const;
@@ -101,6 +105,7 @@ private:
 	bool _need_video_length;
 
 	boost::optional<double> _rotation;
+	bool _pulldown;
 
 #ifdef DCPOMATIC_VARIANT_SWAROOP
 	boost::optional<std::string> _id;