[SCM] libav/experimental: Use the correct chroma values for the data[] array used in draw_slice().

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit b37aa4de2deb79aeb2b8c52a1696d796cde7ce72
Author: Stefano Sabatini <stefano.sabatini-lala at poste.it>
Date:   Sun Nov 29 18:02:19 2009 +0000

    Use the correct chroma values for the data[] array used in
    draw_slice().
    
    The chroma values to use are supposed to be those of the input format,
    not that of the output format, the latter case was causing crashes and
    chroma issues.
    
    Originally committed as revision 20660 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavfilter/vf_scale.c b/libavfilter/vf_scale.c
index 95d2ef1..108811a 100644
--- a/libavfilter/vf_scale.c
+++ b/libavfilter/vf_scale.c
@@ -115,8 +115,6 @@ static int config_props(AVFilterLink *outlink)
     av_log(ctx, AV_LOG_INFO, "w:%d h:%d fmt:%s\n",
            outlink->w, outlink->h, avcodec_get_pix_fmt_name(outlink->format));
 
-    avcodec_get_chroma_sub_sample(outlink->format, &scale->hsub, &scale->vsub);
-
     scale->input_is_pal = inlink->format == PIX_FMT_PAL8      ||
                           inlink->format == PIX_FMT_BGR4_BYTE ||
                           inlink->format == PIX_FMT_RGB4_BYTE ||
@@ -132,6 +130,8 @@ static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
     AVFilterLink *outlink = link->dst->outputs[0];
     AVFilterPicRef *outpicref;
 
+    avcodec_get_chroma_sub_sample(link->format, &scale->hsub, &scale->vsub);
+
     outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
     outpicref->pts = picref->pts;
     outlink->outpic = outpicref;

-- 
Libav/FFmpeg packaging