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Code Issues Releases Activity

avcodec/mpegvideo_enc: Avoid fine lambda steps in VBV retry code when RD is not in use

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Reduces the number of times the vbv retry code is used and should have no
effect on quality

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-09-22 20:17:40 +02:00
parent f9f0b4c08e
commit 31623e9d1e
1 changed files with 4 additions and 2 deletions
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6
libavcodec/mpegvideo_enc.c
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@ -1824,16 +1824,18 @@ vbv_retry:
if (avctx->rc_buffer_size) {
RateControlContext *rcc = &s->rc_context;
int max_size = FFMAX(rcc->buffer_index * avctx->rc_max_available_vbv_use, rcc->buffer_index - 500);
int hq = (s->avctx->mb_decision == FF_MB_DECISION_RD || s->avctx->trellis);
int min_step = hq ? 1 : (1<<(FF_LAMBDA_SHIFT + 7))/139;
if (put_bits_count(&s->pb) > max_size &&
s->lambda < s->lmax) {
s->next_lambda = FFMAX(s->lambda + 1, s->lambda *
s->next_lambda = FFMAX(s->lambda + min_step, s->lambda *
(s->qscale + 1) / s->qscale);
if (s->adaptive_quant) {
int i;
for (i = 0; i < s->mb_height * s->mb_stride; i++)
s->lambda_table[i] =
FFMAX(s->lambda_table[i] + 1,
FFMAX(s->lambda_table[i] + min_step,
s->lambda_table[i] * (s->qscale + 1) /
s->qscale);
}