generic-library/ffmpeg
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fixing

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fixing max_rate/min_rate

Originally committed as revision 951 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-09-18 09:08:03 +00:00
parent ff78c59639
commit 946c8a1281
2 changed files with 18 additions and 7 deletions
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7
ffmpeg.c
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@ -1369,6 +1369,11 @@ void opt_video_bitrate_min(const char *arg)
video_rc_min_rate = atoi(arg) * 1000;
}
void opt_video_buffer_size(const char *arg)
{
video_rc_buffer_size = atoi(arg) * 1000;
}
void opt_video_rc_eq(char *arg)
{
video_rc_eq = arg;
@ -1900,6 +1905,7 @@ void opt_output_file(const char *filename)
video_enc->rc_max_rate = video_rc_max_rate;
video_enc->rc_min_rate = video_rc_min_rate;
video_enc->rc_buffer_size = video_rc_buffer_size;
video_enc->rc_buffer_aggressivity= video_rc_buffer_aggressivity;
video_enc->i_quant_factor = video_i_qfactor;
video_enc->b_quant_factor = video_b_qfactor;
video_enc->i_quant_offset = video_i_qoffset;
@ -2260,6 +2266,7 @@ const OptionDef options[] = {
{ "bt", HAS_ARG, {(void*)opt_video_bitrate_tolerance}, "set video bitrate tolerance (in kbit/s)", "tolerance" },
{ "maxrate", HAS_ARG, {(void*)opt_video_bitrate_max}, "set max video bitrate tolerance (in kbit/s)", "bitrate" },
{ "minrate", HAS_ARG, {(void*)opt_video_bitrate_min}, "set min video bitrate tolerance (in kbit/s)", "bitrate" },
{ "bufsize", HAS_ARG, {(void*)opt_video_buffer_size}, "set ratecontrol buffere size (in kbit)", "size" },
{ "vd", HAS_ARG | OPT_EXPERT, {(void*)opt_video_device}, "set video grab device", "device" },
{ "vcodec", HAS_ARG | OPT_EXPERT, {(void*)opt_video_codec}, "force video codec", "codec" },
{ "me", HAS_ARG | OPT_EXPERT, {(void*)opt_motion_estimation}, "set motion estimation method",

18
libavcodec/ratecontrol.c
View File

@ -377,7 +377,7 @@ static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q,
q*= s->avctx->rc_qmod_amp;
bits= qp2bits(rce, q);
//printf("q:%f\n", q);
/* buffer overflow/underflow protection */
if(buffer_size){
double expected_size= rcc->buffer_index - bits;
@ -385,16 +385,18 @@ static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q,
if(min_rate){
double d= 2*(buffer_size - (expected_size + min_rate))/buffer_size;
if(d>1.0) d=1.0;
q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
else if(d<0.0001) d=0.0001;
q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
}
if(max_rate){
double d= 2*expected_size/buffer_size;
if(d>1.0) d=1.0;
q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
else if(d<0.0001) d=0.0001;
q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
}
}
//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);
if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
if (q<qmin) q=qmin;
else if(q>qmax) q=qmax;
@ -460,7 +462,7 @@ int ff_rate_estimate_qscale(MpegEncContext *s)
get_qminmax(&qmin, &qmax, s, pict_type);
fps= (double)s->frame_rate / FRAME_RATE_BASE;
//printf("input_picture_number:%d picture_number:%d\n", s->input_picture_number, s->picture_number);
//printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
/* update predictors */
if(picture_number>2){
const int last_var= s->last_pict_type == I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
@ -544,6 +546,8 @@ int ff_rate_estimate_qscale(MpegEncContext *s)
q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
//printf("%f ", q);
}
assert(q>0.0);
q= modify_qscale(s, rce, q, picture_number);
rcc->pass1_wanted_bits+= s->bit_rate/fps;
@ -566,8 +570,8 @@ int ff_rate_estimate_qscale(MpegEncContext *s)
qscale= (int)(q + 0.5);
//printf("%d ", qscale);
//printf("q:%d diff:%d comp:%f rate_q:%d st_q:%f fvar:%d last_size:%d\n", qscale, (int)diff, br_compensation,
// rate_q, short_term_q, s->mc_mb_var, s->frame_bits);
//printf("q:%d diff:%d comp:%f st_q:%f last_size:%d\n", qscale, (int)diff, br_compensation,
// short_term_q, s->frame_bits);
//printf("%d %d\n", s->bit_rate, (int)fps);
rcc->last_qscale= qscale;