Hand-apply 75be314ee89fb2f4e783b4079f7fabf69e79d636 from master; fix hidden content...

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

diff --git a/src/lib/ffmpeg_decoder.cc b/src/lib/ffmpeg_decoder.cc
index e90c33c80a848bca3c3faecbd7032c1df72d0526..810aa775bda70082b8fc51a4979489e72d74c48d 100644 (file)
--- a/src/lib/ffmpeg_decoder.cc
+++ b/src/lib/ffmpeg_decoder.cc
@@ -97,6 +97,14 @@ FFmpegDecoder::FFmpegDecoder (shared_ptr<const FFmpegContent> c, shared_ptr<Log>
                _pts_offset = - c->audio_stream()->first_audio.get();
        }
 
+       /* If _pts_offset is positive we would be pushing things from a -ve PTS to be played.
+          I don't think we ever want to do that, as it seems things at -ve PTS are not meant
+          to be seen (use for alignment bars etc.); see mantis #418.
+       */
+       if (_pts_offset > 0) {
+               _pts_offset = 0;
+       }
+
        /* Now adjust both so that the video pts starts on a frame */
        if (have_video && have_audio) {
                ContentTime first_video = c->first_video().get() + _pts_offset;