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lavc/qsvenc: set HRD buffer size

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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@intel.com>
Signed-off-by: Maxym Dmytrychenko <maxim.d33@gmail.com>
This commit is contained in:
Li, Zhong 2017-12-01 16:48:45 +08:00 committed by Maxym Dmytrychenko
parent 18a0f42026
commit 6ff29343b0
1 changed files with 1 additions and 0 deletions
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libavcodec/qsvenc.c
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@ -503,6 +503,7 @@ 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;