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

[David Rosca]

On Tue, Mar 4, 2025 at 2:55 AM Wang, Fei W
<fei.w.wang-at-intel.com at ffmpeg.org> wrote:
>
> 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.

I see, it's still broken for L0=1, L1=1 (also broken on master).
This patch fixes it for L0=1, L1=0 only.

David
>
> 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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