[FFmpeg-devel] [PATCH] vp9: ignore frame_context_index field in key-/intraonly-frames.

[wm4]

On Sat, 16 Apr 2016 13:56:18 -0400
"Ronald S. Bultje" <rsbultje at gmail.com> wrote:

> 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) {

Might be a good idea to indicate in the comment that it's not a lavc
bug, but reproduces a vpx one.