[FFmpeg-devel] [PATCH] qsvenc_hevc: Enable look ahead with ExtBRC

[Zhong Li]

Xiang, Haihao <haihao.xiang at intel.com> 于2021年12月6日周一 11:09写道：
> > --- a/libavcodec/qsvenc_hevc.c
> > +++ b/libavcodec/qsvenc_hevc.c
> > @@ -248,6 +248,7 @@ static const AVOption options[] = {
> >      { "tile_rows",  "Number of rows for tiled
> > encoding",      OFFSET(qsv.tile_rows),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0,
> > UINT16_MAX, VE },
> >      { "recovery_point_sei", "Insert recovery point SEI
> > messages",       OFFSET(qsv.recovery_point_sei),      AV_OPT_TYPE_INT, { .i64
> > = -1 },               -1,          1, VE },
> >      { "aud", "Insert the Access Unit Delimiter NAL", OFFSET(qsv.aud),
> > AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE},
> > +    { "look_ahead_depth", "Depth of look ahead in number frames",
> > OFFSET(qsv.look_ahead_depth), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 100, VE },
> >
> >      { NULL },
> >  };
>
> Any comment for this patch ? Could someone help to merge this patch if no
> objection ?

How to verify this function? is it depended on a special version of
MSDK && vaapi-driver?
I tried to enable extbrc and disable/enable look_ahead_depth (set to
zero/20) for hevc_qsv but found there are no difference of the encoded
files.