[FFmpeg-devel] [PATCH] lavc/vaapi_encode_av1: Always use slot 0 with 1 l0 ref

[Wang, Fei W]

On Mon, 2025-03-03 at 14:47 +0100, David Rosca wrote:
> On Wed, Jan 15, 2025 at 10:41 PM David Rosca <nowrep at gmail.com>
> wrote:
> > 
> > Don't need to alternate when only one reference is used.
> > Fixes fail after bf9f921ef7 ("avcodec/hw_base_encode: restrict size
> > of next_prev")
> > due to AV1 writer complaining about incorrect ref_order_hint value.
> 
> Ping.

Did you encode successful when ctx.base.ref_l0 equals to 1? There is an
error with this patch:

$ ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -i input.mp4 -c:v
av1_vaapi -y out.mp4
...
[av1_vaapi @ 0x6246182df640] frame_type does not match inferred value:
1, but should be 0.
[av1_vaapi @ 0x6246182df640] Failed to write unit 0 (type 3).
[av1_vaapi @ 0x6246182df640] Failed to write packed header.

Thanks
Fei

> 
> > ---
> >  libavcodec/vaapi_encode_av1.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/libavcodec/vaapi_encode_av1.c
> > b/libavcodec/vaapi_encode_av1.c
> > index 1b350cd936..aca6c26aa2 100644
> > --- a/libavcodec/vaapi_encode_av1.c
> > +++ b/libavcodec/vaapi_encode_av1.c
> > @@ -504,7 +504,7 @@ static int
> > vaapi_encode_av1_init_picture_params(AVCodecContext *avctx,
> >          fh->base_q_idx = priv->q_idx_p;
> >          ref = pic->refs[0][pic->nb_refs[0] - 1];
> >          href = ref->codec_priv;
> > -        hpic->slot = !href->slot;
> > +        hpic->slot = ctx->base.ref_l0 > 1 ? !href->slot : 0;
> >          hpic->last_idr_frame = href->last_idr_frame;
> >          fh->refresh_frame_flags = 1 << hpic->slot;
> > 
> > --
> > 2.48.1
> > 
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