[libav-devel] [PATCH V2] lavc/qsvenc: set HRD buffer size

Li, Zhong zhong.li at intel.com
Thu Dec 7 08:31:07 CET 2017


> will check it shortly
> 
Got it, thanks. : ) 

> On Fri, Dec 1, 2017 at 9:48 AM, Zhong Li <zhong.li at intel.com> wrote:
> 
> > Hypothetical Reference Decoding (HRD) model assumes that data flows
> > into a buffer of the fixed size BufferSizeInKB with a constant bitrate.
> > Smaller BufferSizeInKB means smaller frame size variations, but more
> > difficult to maintain HRD.
> >
> > Signed-off-by: Zhong Li <zhong.li at intel.com>
> > ---
> >  libavcodec/qsvenc.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c index
> > 57f78c4..96c8fb5 100644
> > --- a/libavcodec/qsvenc.c
> > +++ b/libavcodec/qsvenc.c
> > @@ -495,6 +495,7 @@ static int init_video_param(AVCodecContext
> *avctx,
> > QSVEncContext *q)  #if QSV_HAVE_VCM
> >      case MFX_RATECONTROL_VCM:
> >  #endif
> > +        q->param.mfx.BufferSizeInKB   = avctx->rc_buffer_size /
> 8000;
> >          q->param.mfx.InitialDelayInKB =
> > avctx->rc_initial_buffer_occupancy
> > / 1000;
> >          q->param.mfx.TargetKbps       = avctx->bit_rate / 1000;
> >          q->param.mfx.MaxKbps          = avctx->rc_max_rate /
> 1000;
> > --
> > 1.8.3.1


More information about the libav-devel mailing list