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

[dcpomatic.git] / src / lib / ffmpeg_content.cc

diff --git a/src/lib/ffmpeg_content.cc b/src/lib/ffmpeg_content.cc
index f3c0d01cbafc792eb9356ae6b484a6e4e420a1ea..1fb95535f0e74af738f262f481fc22e380d300e6 100644 (file)
--- a/src/lib/ffmpeg_content.cc
+++ b/src/lib/ffmpeg_content.cc
@@ -337,6 +337,14 @@ FFmpegContent::examine (shared_ptr<const Film> film, shared_ptr<Job> job)
                set_default_colour_conversion ();
        }
 
+       if (examiner->has_video() && examiner->pulldown() && video_frame_rate() && fabs(*video_frame_rate() - 29.97) < 0.001) {
+               /* FFmpeg has detected this file as 29.97 and the examiner thinks it is using "soft" 2:3 pulldown (telecine).
+                * This means we can treat it as a 23.976fps file.
+                */
+               set_video_frame_rate (24000.0 / 1001);
+               video->set_length (video->length() * 24.0 / 30);
+       }
+
 #ifdef DCPOMATIC_VARIANT_SWAROOP
        _id = examiner->id ();
 #endif