libav: fix h.264 initial recovery point detection

Initial GOP of video was dropped during decode.
Fixes https://github.com/HandBrake/HandBrake/issues/520

(cherry picked from commit 9dfe1373a9d1cb37843f3ffbe88fd63b630026c6)

diff --git a/contrib/ffmpeg/A05-h264-recovery.patch b/contrib/ffmpeg/A05-h264-recovery.patch
new file mode 100644 (file)
index 0000000..d27b35b
--- /dev/null
+++ b/contrib/ffmpeg/A05-h264-recovery.patch
@@ -0,0 +1,20 @@
+diff --git a/libavcodec/h264dec.c b/libavcodec/h264dec.c
+index 5137039..6d7aa7b 100644
+--- a/libavcodec/h264dec.c
++++ b/libavcodec/h264dec.c
+@@ -452,7 +452,6 @@ void ff_h264_flush_change(H264Context *h)
+     if (h->cur_pic_ptr)
+         h->cur_pic_ptr->reference = 0;
+     h->first_field = 0;
+-    ff_h264_sei_uninit(&h->sei);
+     h->recovery_frame = -1;
+     h->frame_recovered = 0;
+ }
+@@ -466,6 +465,7 @@ static void flush_dpb(AVCodecContext *avctx)
+     memset(h->delayed_pic, 0, sizeof(h->delayed_pic));
+ 
+     ff_h264_flush_change(h);
++    ff_h264_sei_uninit(&h->sei);
+ 
+     for (i = 0; i < H264_MAX_PICTURE_COUNT; i++)
+         ff_h264_unref_picture(h, &h->DPB[i]);