[FFmpeg-cvslog] vf_scale: Use correct chroma positions for YUV420P
Kieran Kunhya
git at videolan.org
Thu Dec 25 02:56:03 CET 2014
ffmpeg | branch: master | Kieran Kunhya <kierank at obe.tv> | Wed Dec 24 23:52:46 2014 +0000| [1515bfb3132d9e040f856bc48fbe8a4f26b14c14] | committer: Michael Niedermayer
vf_scale: Use correct chroma positions for YUV420P
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1515bfb3132d9e040f856bc48fbe8a4f26b14c14
---
libavfilter/vf_scale.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/libavfilter/vf_scale.c b/libavfilter/vf_scale.c
index 64b88c2..f77884c 100644
--- a/libavfilter/vf_scale.c
+++ b/libavfilter/vf_scale.c
@@ -373,6 +373,17 @@ static int config_props(AVFilterLink *outlink)
av_opt_set_int(*s, "dst_format", outfmt, 0);
av_opt_set_int(*s, "sws_flags", scale->flags, 0);
+ /* Override YUV420P settings to have the correct (MPEG-2) chroma positions
+ * MPEG-2 chroma positions are used by convention
+ * XXX: support other 4:2:0 pixel formats */
+ if (inlink->format == AV_PIX_FMT_YUV420P) {
+ scale->in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
+ }
+
+ if (outlink->format == AV_PIX_FMT_YUV420P) {
+ scale->out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
+ }
+
av_opt_set_int(*s, "src_h_chr_pos", scale->in_h_chr_pos, 0);
av_opt_set_int(*s, "src_v_chr_pos", scale->in_v_chr_pos, 0);
av_opt_set_int(*s, "dst_h_chr_pos", scale->out_h_chr_pos, 0);
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