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bit_rate in mpeg1/2 should be 0x3FFFF for vbr or at least >= max_bitrate

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Originally committed as revision 2180 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2003-08-29 19:42:23 +00:00
parent 904736b519
commit 12dccd4e60
3 changed files with 20 additions and 13 deletions
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21
libavcodec/mpeg12.c
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@@ -227,18 +227,25 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
put_bits(&s->pb, 4, s->aspect_ratio_info);
put_bits(&s->pb, 4, s->frame_rate_index);
v = (s->bit_rate + 399) / 400;
if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
v = 0x3ffff;
put_bits(&s->pb, 18, v & 0x3FFFF);
put_bits(&s->pb, 1, 1); /* marker */
if(s->avctx->rc_max_rate){
v = (s->avctx->rc_max_rate + 399) / 400;
if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
v = 0x3ffff;
}else{
v= 0x3FFFF;
}
if(s->avctx->rc_buffer_size)
vbv_buffer_size = s->avctx->rc_buffer_size;
else
/* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
put_bits(&s->pb, 10, ((vbv_buffer_size + 16383) / 16384) & 0x3FF);
vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
put_bits(&s->pb, 18, v & 0x3FFFF);
put_bits(&s->pb, 1, 1); /* marker */
put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
put_bits(&s->pb, 1, 1); /* constrained parameter flag */
ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);