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

Maxym Dmytrychenko maxim.d33 at gmail.com
Mon Dec 4 19:29:24 CET 2017


will check it shortly

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
>
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