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ratecontrol: correct predictor in case of stuffing

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-09-11 17:20:08 +02:00
parent 2fe8fd3948
commit a990a30883
3 changed files with 4 additions and 1 deletions
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1
libavcodec/mpegvideo.h
View File

@ -469,6 +469,7 @@ typedef struct MpegEncContext {
/* bit rate control */
int64_t total_bits;
int frame_bits; ///< bits used for the current frame
int stuffing_bits; ///< bits used for stuffing
int next_lambda; ///< next lambda used for retrying to encode a frame
RateControlContext rc_context; ///< contains stuff only accessed in ratecontrol.c

1
libavcodec/mpegvideo_enc.c
View File

@ -1579,6 +1579,7 @@ vbv_retry:
s->frame_bits = put_bits_count(&s->pb);
stuffing_count = ff_vbv_update(s, s->frame_bits);
s->stuffing_bits = 8*stuffing_count;
if (stuffing_count) {
if (s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb) >> 3) <
stuffing_count + 50) {

3
libavcodec/ratecontrol.c
View File

@ -679,7 +679,8 @@ float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
/* update predictors */
if(picture_number>2 && !dry_run){
const int last_var= s->last_pict_type == AV_PICTURE_TYPE_I ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
av_assert1(s->frame_bits >= s->stuffing_bits);
update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits - s->stuffing_bits);
}
if(s->flags&CODEC_FLAG_PASS2){