On Mon, Apr 8, 2024 at 11:15 PM Frank Plowman <p...@frankplowman.com> wrote:
> On 08/04/2024 15:12, Nuo Mi wrote: > > On Mon, Apr 8, 2024 at 4:37 PM Frank Plowman <p...@frankplowman.com> > wrote: > > > >> On 07/04/2024 15:48, James Almer wrote: > >>> On 4/7/2024 10:38 AM, Nuo Mi wrote: > >>>> On Sun, Apr 7, 2024 at 11:05 AM James Almer <jamr...@gmail.com> > wrote: > >>>> > >>>>> Signed-off-by: James Almer <jamr...@gmail.com> > >>>>> --- > >>>>> libavcodec/vvc/ps.c | 1 + > >>>>> 1 file changed, 1 insertion(+) > >>>>> > >>>>> diff --git a/libavcodec/vvc/ps.c b/libavcodec/vvc/ps.c > >>>>> index 3c71c34bae..83ee75fb62 100644 > >>>>> --- a/libavcodec/vvc/ps.c > >>>>> +++ b/libavcodec/vvc/ps.c > >>>>> @@ -912,6 +912,7 @@ void ff_vvc_ps_uninit(VVCParamSets *ps) > >>>>> ff_refstruct_unref(&ps->sps_list[i]); > >>>>> for (int i = 0; i < FF_ARRAY_ELEMS(ps->pps_list); i++) > >>>>> ff_refstruct_unref(&ps->pps_list[i]); > >>>>> + ps->sps_id_used = 0; > >>>>> > >>>> Hi James, > >>>> thank you for the patch. > >>>> > >>>> Is this really necessary? > >>>> vvc_ps_uninit will be called by vvc_decode_free, > >>>> We are not supposed to use any member of VVCParamSets after > >>>> vvc_decode_free. > >>> > >>> My bad, i thought it was also called on every flush() call. > >>> > >>> Something like the following: > >>> > >>>> diff --git a/libavcodec/vvc/dec.c b/libavcodec/vvc/dec.c > >>>> index eb447604fe..463536512e 100644 > >>>> --- a/libavcodec/vvc/dec.c > >>>> +++ b/libavcodec/vvc/dec.c > >>>> @@ -963,6 +963,8 @@ static av_cold void > >>>> vvc_decode_flush(AVCodecContext *avctx) > >>>> ff_vvc_flush_dpb(last); > >>>> } > >>>> > >>>> + s->ps->sps_id_used = 0; > >>>> + > >>>> s->eos = 1; > >>>> } > >>> > >>> Should be done on FFCodec.flush() (like when seeking) as the previous > >>> state is no longer valid, right? > >> > >> Yes I agree, I think this is needed. Cases where the random access > >> point has no leading pictures should be covered by the existing logic as > >> these always fall at the start of a CVS, but I think this is needed to > >> cover the case in which there are leading pictures. > >> > > This patch isn't necessary. > > Leading pictures won't carry SPS. > > IDR, CRA, and GDR will carry SPS, but they will also start a new CVS, > which > > will covered by the current logic. > > > > I may be misunderstanding the spec, NoOutputBeforeRecoveryFlag is set > for pictures which have no leading pictures, no? In any case take, for > instance, a CRA picture. In most cases, CRA pictures have > NoOutputBeforeRecoveryFlag=0, therefore are not CLVSS pictures and > sps_id_used is not reset by the existing logic. Do we not need to reset > sps_id_used when seeking to a CRA then? > After seeking, we'll set s->last_eos to 1. For a CRA, decode_recovery_flag will set s->no_output_before_recovery_flag to s->last_eos. So no_output_before_recovery_flag will be 1, not 0. _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".