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CBR improvements

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Originally committed as revision 2601 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-12-12 19:26:55 +00:00
parent 7a0f9d7e7d
commit fb0666392c
3 changed files with 25 additions and 18 deletions
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5
ffmpeg.c
View File

@ -1567,7 +1567,7 @@ static void opt_video_bitrate_min(const char *arg)
static void opt_video_buffer_size(const char *arg)
{
video_rc_buffer_size = atoi(arg) * 1000;
video_rc_buffer_size = atoi(arg) * 1024;
}
static void opt_video_rc_eq(char *arg)
@ -2767,6 +2767,7 @@ static void opt_target(const char *arg)
video_bit_rate = 1150000;
video_rc_max_rate = 1150000;
video_rc_min_rate = 1150000;
video_rc_buffer_size = 40*1024*8;
audio_bit_rate = 224000;
audio_sample_rate = 44100;
@ -2783,6 +2784,7 @@ static void opt_target(const char *arg)
video_bit_rate = 2040000;
video_rc_max_rate = 2516000;
video_rc_min_rate = 1145000;
video_rc_buffer_size = 224*1024*8;
audio_bit_rate = 224000;
audio_sample_rate = 44100;
@ -2799,6 +2801,7 @@ static void opt_target(const char *arg)
video_bit_rate = 6000000;
video_rc_max_rate = 9000000;
video_rc_min_rate = 1500000;
video_rc_buffer_size = 224*1024*8;
audio_bit_rate = 448000;
audio_sample_rate = 48000;

2
libavcodec/mpegvideo.h
View File

@ -93,7 +93,7 @@ typedef struct RateControlContext{
FILE *stats_file;
int num_entries; ///< number of RateControlEntries
RateControlEntry *entry;
int buffer_index; ///< amount of bits in the video/audio buffer
double buffer_index; ///< amount of bits in the video/audio buffer
Predictor pred[5];
double short_term_qsum; ///< sum of recent qscales
double short_term_qcount; ///< count of recent qscales

36
libavcodec/ratecontrol.c
View File

@ -1,7 +1,7 @@
/*
* Rate control for video encoders
*
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2002-2003 Michael Niedermayer <michaelni@gmx.at>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -62,7 +62,7 @@ int ff_rate_control_init(MpegEncContext *s)
rcc->frame_count[i]= 1; // 1 is better cuz of 1/0 and such
rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
}
rcc->buffer_index= s->avctx->rc_buffer_size/2;
rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy;
if(s->flags&CODEC_FLAG_PASS2){
int i;
@ -202,20 +202,23 @@ static void update_rc_buffer(MpegEncContext *s, int frame_size){
const double min_rate= s->avctx->rc_min_rate/fps;
const double max_rate= s->avctx->rc_max_rate/fps;
//printf("%f %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
if(buffer_size){
int left;
rcc->buffer_index-= frame_size;
if(rcc->buffer_index < buffer_size/2 /*FIXME /2 */ || min_rate==0){
rcc->buffer_index+= max_rate;
if(rcc->buffer_index >= buffer_size)
rcc->buffer_index= buffer_size-1;
}else{
rcc->buffer_index+= min_rate;
}
if(rcc->buffer_index < 0)
if(rcc->buffer_index < 0){
av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
if(rcc->buffer_index >= s->avctx->rc_buffer_size)
rcc->buffer_index= 0;
}
left= buffer_size - rcc->buffer_index - 1;
rcc->buffer_index += clip(left, min_rate, max_rate);
if(rcc->buffer_index > s->avctx->rc_buffer_size){
av_log(s->avctx, AV_LOG_ERROR, "rc buffer overflow\n");
rcc->buffer_index= s->avctx->rc_buffer_size;
}
}
}
@ -385,8 +388,9 @@ static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q,
double bits;
const int pict_type= rce->new_pict_type;
const double buffer_size= s->avctx->rc_buffer_size;
const double min_rate= s->avctx->rc_min_rate;
const double max_rate= s->avctx->rc_max_rate;
const double fps= (double)s->avctx->frame_rate / (double)s->avctx->frame_rate_base;
const double min_rate= s->avctx->rc_min_rate / fps;
const double max_rate= s->avctx->rc_max_rate / fps;
get_qminmax(&qmin, &qmax, s, pict_type);
@ -406,7 +410,7 @@ static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q,
else if(d<0.0001) d=0.0001;
q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
q= FFMIN(q, bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*2, 1)));
q= FFMIN(q, bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1)));
}
if(max_rate){
@ -415,7 +419,7 @@ static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q,
else if(d<0.0001) d=0.0001;
q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
q= FFMAX(q, bits2qp(rce, FFMAX(rcc->buffer_index/2, 1)));
q= FFMAX(q, bits2qp(rce, FFMAX(rcc->buffer_index/3, 1)));
}
}
//printf("q:%f max:%f min:%f size:%f index:%d bits:%f agr:%f\n", q,max_rate, min_rate, buffer_size, rcc->buffer_index, bits, s->avctx->rc_buffer_aggressivity);