[SCM] libav/experimental: Fix VBV delay for mpeg1/2 CBR.
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 16:45:47 UTC 2013
The following commit has been merged in the experimental branch:
commit 4601e76a4323deec30cc6b1d2cf1f192feedccbc
Author: Michael Niedermayer <michaelni at gmx.at>
Date: Thu May 14 03:37:58 2009 +0000
Fix VBV delay for mpeg1/2 CBR.
Originally committed as revision 18820 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
index fbabd06..ec291bf 100644
--- a/libavcodec/mpegvideo_enc.c
+++ b/libavcodec/mpegvideo_enc.c
@@ -1305,11 +1305,21 @@ vbv_retry:
/* update mpeg1/2 vbv_delay for CBR */
if(s->avctx->rc_max_rate && s->avctx->rc_min_rate == s->avctx->rc_max_rate && s->out_format == FMT_MPEG1
&& 90000LL * (avctx->rc_buffer_size-1) <= s->avctx->rc_max_rate*0xFFFFLL){
- int vbv_delay;
+ int vbv_delay, min_delay;
+ double inbits = s->avctx->rc_max_rate*av_q2d(s->avctx->time_base);
+ int minbits= s->frame_bits - 8*(s->vbv_delay_ptr - s->pb.buf - 1);
+ double bits = s->rc_context.buffer_index + minbits - inbits;
+
+ if(bits<0)
+ av_log(s->avctx, AV_LOG_ERROR, "Internal error, negative bits\n");
assert(s->repeat_first_field==0);
- vbv_delay= lrintf(90000 * s->rc_context.buffer_index / s->avctx->rc_max_rate);
+ vbv_delay= bits * 90000 / s->avctx->rc_max_rate;
+ min_delay= (minbits * 90000LL + s->avctx->rc_max_rate - 1)/ s->avctx->rc_max_rate;
+
+ vbv_delay= FFMAX(vbv_delay, min_delay);
+
assert(vbv_delay < 0xFFFF);
s->vbv_delay_ptr[0] &= 0xF8;
--
Libav/FFmpeg packaging
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