From: Carl Hetherington <cth@carlh.net>
Date: Sun, 14 Jun 2015 21:05:45 +0000 (+0100)
Subject: Fix failure on 1-frame-back seek (#604).
X-Git-Tag: v2.1.4~19
X-Git-Url: https://git.carlh.net/gitweb/?a=commitdiff_plain;h=2651ef8c2fd486332457630d459c1e620e626c1b;p=dcpomatic.git

Fix failure on 1-frame-back seek (#604).

I don't know why this works, but it's what 1.x has been using;
I can't find any documentation on what AVSEEK_FLAG_BACKWARD is supposed
to mean.
---

diff --git a/src/lib/ffmpeg_decoder.cc b/src/lib/ffmpeg_decoder.cc
index 6f91922eb..f8152b56e 100644
--- a/src/lib/ffmpeg_decoder.cc
+++ b/src/lib/ffmpeg_decoder.cc
@@ -316,7 +316,7 @@ FFmpegDecoder::seek (ContentTime time, bool accurate)
 	*/
 	
 	ContentTime const u = time - _pts_offset;
-	av_seek_frame (_format_context, _video_stream, u.seconds() / av_q2d (_format_context->streams[_video_stream]->time_base), 0);
+	av_seek_frame (_format_context, _video_stream, u.seconds() / av_q2d (_format_context->streams[_video_stream]->time_base), AVSEEK_FLAG_BACKWARD);
 
 	avcodec_flush_buffers (video_codec_context());