[FFmpeg-devel] [PATCH 2/3] lavc: add a framework to fix alignment problems.

[Nicolas George]

Le primidi 21 floréal, an CCXXV, Michael Niedermayer a écrit :
> breaks (green stuff on edges)
>  ./ffmpeg -i ~/videos/matrixbench_mpeg2.mpg -an -vframes 5  -vf uspp=4:8 -qscale 1 -y file.avi

It is a bug in vf_uspp: 

diff --git a/libavfilter/vf_uspp.c b/libavfilter/vf_uspp.c
index ef493b860f..6e378253a0 100644
--- a/libavfilter/vf_uspp.c
+++ b/libavfilter/vf_uspp.c
@@ -250,6 +250,9 @@ static void filter(USPPContext *p, uint8_t *dst[3], uint8_t *src[3],
         p->frame->data[2] = p->src[2] + x1c  + y1c  * p->frame->linesize[2];
         p->frame->format  = p->avctx_enc[i]->pix_fmt;
 
+        av_log(0, 16, "encode %d x %d with %d x %d\n",
+               p->frame->width, p->frame->height,
+               p->avctx_enc[i]->width, p->avctx_enc[i]->height);
         ret = avcodec_encode_video2(p->avctx_enc[i], &pkt, p->frame, &got_pkt_ptr);
         if (ret < 0) {
             av_log(p->avctx_enc[i], AV_LOG_ERROR, "Encoding failed\n");

gives:

  Stream #0:1 -> #0:0 (mpeg2video (native) -> mpeg4 (native))
encode 720 x 576 with 736 x 592
zsh: segmentation fault  ./ffmpeg_g -nostdin -i ~/tmp/samples/matrixbench_mpeg2.mpg -an -vframes 5 -vf

vf_uspp is giving a 720×576 frame to a 736×592 encoder.

I do not know how to fix that.

Regards,

-- 
  Nicolas George
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