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skip blocks with small chroma dc too (if the user wants it) needed to avoid IDCT(input coeffs !=0) == 0 problems which cause catastrophic error accumulation at qp=1

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Originally committed as revision 853 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-08-17 20:10:27 +00:00
parent 890f093a76
commit f5866a0340
1 changed files with 5 additions and 1 deletions
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4
libavcodec/mpegvideo.c
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@ -1589,6 +1589,10 @@ static inline void dct_single_coeff_elimination(MpegEncContext *s, int n, int th
const int last_index= s->block_last_index[n]; const int last_index= s->block_last_index[n];
if(skip_dc) skip_dc=1; if(skip_dc) skip_dc=1;
if(threshold<0){
skip_dc=0;
threshold= -threshold;
}
/* are all which we could set to zero are allready zero? */ /* are all which we could set to zero are allready zero? */
if(last_index<=skip_dc - 1) return; if(last_index<=skip_dc - 1) return;