Fixes passing through mismatching metadata from the input side
when RGB input (from f.ex. H.264 or HEVC) gets converted to YCbCr.
Fixes #9132
---
libavfilter/vf_scale.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/libavfilter/vf_scale.c b/libavfilter/vf_scale.c
index ce39217515..7ca833bbb1 100644
--- a/libavfilter/vf_scale.c
+++ b/libavfilter/vf_scale.c
@@ -738,6 +738,15 @@ scale:
out->width = outlink->w;
out->height = outlink->h;
+ // Sanity check: If we've got the RGB/XYZ (identity) matrix configured, and
+ // the output is no longer RGB, unset the matrix.
+ // In theory this should be in swscale itself as the AVFrame
+ // based API gets in, so that not every swscale API user has
+ // to go through duplicating such sanity checks.
+ if (out->colorspace == AVCOL_SPC_RGB &&
+ !(av_pix_fmt_desc_get(out->format)->flags & AV_PIX_FMT_FLAG_RGB))
+ out->colorspace = AVCOL_SPC_UNSPECIFIED;
+
if (scale->output_is_pal)
avpriv_set_systematic_pal2((uint32_t*)out->data[1], outlink->format ==
AV_PIX_FMT_PAL8 ? AV_PIX_FMT_BGR8 : outlink->format);
--
2.31.1
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