[FFmpeg-cvslog] lavc/qsvenc: set HRD buffer size

[Li, Zhong]

ffmpeg | branch: master | Li, Zhong <zhong.li at intel.com> | Fri Dec  1 16:48:45 2017 +0800| [6ff29343b01923e9b125fe7404ac8701cdfb1fe5] | committer: Maxym Dmytrychenko

lavc/qsvenc: set HRD buffer size

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>
Signed-off-by: Maxym Dmytrychenko <maxim.d33 at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6ff29343b01923e9b125fe7404ac8701cdfb1fe5
---

 libavcodec/qsvenc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
index 9db9eb375c..f6034c443d 100644
--- a/libavcodec/qsvenc.c
+++ b/libavcodec/qsvenc.c
@@ -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;