From 027ee9b3ed697ff080be0f14b47a11c89ce68cdd Mon Sep 17 00:00:00 2001
From: "Ronald S. Bultje" <rsbultje@gmail.com>
Date: Tue, 28 Mar 2017 15:04:46 -0400
Subject: pthread_frame: don't sync items between threads for intra-only
 codecs.

Intra-only codecs should either be able to read these items from the
bitstream, or they should be set upon codec initialization. In both
cases, syncing these items at runtime is unnecessary.

In practice, this fixes race conditions for decoders that read these
values from the bitstream.
---
 libavcodec/pthread_frame.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/pthread_frame.c b/libavcodec/pthread_frame.c
index b618be0..295763a 100644
--- a/libavcodec/pthread_frame.c
+++ b/libavcodec/pthread_frame.c
@@ -244,7 +244,7 @@ static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src,
 {
     int err = 0;
 
-    if (dst != src) {
+    if (dst != src && (for_user || !(av_codec_get_codec_descriptor(src)->props & AV_CODEC_PROP_INTRA_ONLY))) {
         dst->time_base = src->time_base;
         dst->framerate = src->framerate;
         dst->width     = src->width;
-- 
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