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vf_scale: Use correct chroma positions for YUV420P

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Kieran Kunhya 2014-12-24 23:52:46 +00:00 committed by Michael Niedermayer
parent b51cc701bc
commit 1515bfb313
1 changed files with 11 additions and 0 deletions
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11
libavfilter/vf_scale.c
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@ -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);