RepoMirrors
/
ffmpeg
mirror of https://git.ffmpeg.org/ffmpeg.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

vaapi_h264: Fix HRD bit_rate/cpb_size scaling 

There should be an extra offset of 6 on bit_rate_scale and of 4 on
cpb_size_scale which were not accounted for here.

(cherry picked from commit 3a9662af6c)
This commit is contained in:
Mark Thompson 2016-09-13 00:25:07 +01:00
parent 156fbbb562
commit 06d73d002e
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
libavcodec/vaapi_encode_h264.c
View File

@ -861,14 +861,14 @@ static int vaapi_encode_h264_init_sequence_params(AVCodecContext *avctx)
// Try to scale these to a sensible range so that the
// golomb encode of the value is not overlong.
mseq->bit_rate_scale =
av_clip_uintp2(av_log2(avctx->bit_rate) - 15, 4);
av_clip_uintp2(av_log2(avctx->bit_rate) - 15 - 6, 4);
mseq->bit_rate_value_minus1[0] =
(avctx->bit_rate >> mseq->bit_rate_scale) - 1;
(avctx->bit_rate >> mseq->bit_rate_scale + 6) - 1;
mseq->cpb_size_scale =
av_clip_uintp2(av_log2(priv->hrd_params.hrd.buffer_size) - 15, 4);
av_clip_uintp2(av_log2(priv->hrd_params.hrd.buffer_size) - 15 - 4, 4);
mseq->cpb_size_value_minus1[0] =
(priv->hrd_params.hrd.buffer_size >> mseq->cpb_size_scale) - 1;
(priv->hrd_params.hrd.buffer_size >> mseq->cpb_size_scale + 4) - 1;
// CBR mode isn't actually available here, despite naming.
mseq->cbr_flag[0] = 0;