ffmpeg | branch: master | Lynne <d...@lynne.ee> | Tue Dec 17 14:56:33 2019 +0000| [377a095dc37222a373fba00579145e77629a5e81] | committer: Lynne
vc2enc: zero padding of the coefficient buffer Wavelet types with large amounts of overreading/writing like 9_7 would write into the padding at high wavelet depths, which would remain and be read by the next frame's transform and quickly cause artifacts to appear for subsequent frames. This fix affects all frames encoded with a non-power-of-two width, with the artifacts varying between non-observable to very noticeable, depending on encoder settings, so reencoding is advisable. > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=377a095dc37222a373fba00579145e77629a5e81 --- libavcodec/vc2enc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavcodec/vc2enc.c b/libavcodec/vc2enc.c index d0101e01e4..ba5a03e4ec 100644 --- a/libavcodec/vc2enc.c +++ b/libavcodec/vc2enc.c @@ -867,6 +867,7 @@ static int dwt_plane(AVCodecContext *avctx, void *arg) for (x = 0; x < p->width; x++) { buf[x] = pix[x] - s->diff_offset; } + memset(&buf[x], 0, (p->coef_stride - p->width)*sizeof(dwtcoef)); buf += p->coef_stride; pix += pix_stride; } @@ -876,6 +877,7 @@ static int dwt_plane(AVCodecContext *avctx, void *arg) for (x = 0; x < p->width; x++) { buf[x] = pix[x] - s->diff_offset; } + memset(&buf[x], 0, (p->coef_stride - p->width)*sizeof(dwtcoef)); buf += p->coef_stride; pix += pix_stride; } _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
