Reproduces a bug to remain consistent with libvpx' behaviour.
---
libavcodec/vp9.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavcodec/vp9.c b/libavcodec/vp9.c
index 5c6f176..70d9c4b 100644
--- a/libavcodec/vp9.c
+++ b/libavcodec/vp9.c
@@ -642,6 +642,8 @@ static int decode_frame_header(AVCodecContext *ctx,
s->s.h.refreshctx = s->s.h.errorres ? 0 : get_bits1(&s->gb);
s->s.h.parallelmode = s->s.h.errorres ? 1 : get_bits1(&s->gb);
s->s.h.framectxid = c = get_bits(&s->gb, 2);
+ if (s->s.h.keyframe || s->s.h.intraonly)
+ s->s.h.framectxid = 0; // BUG: ignore field in keyframes
/* loopfilter header data */
if (s->s.h.keyframe || s->s.h.errorres || s->s.h.intraonly) {
--
2.1.2
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