[FFmpeg-cvslog] avcodec/ffv1dec: Fix a YUVA issue with remaping

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Mar 15 00:52:30 2025 +0100| [2471b22023756df145d24f9dcb00a56eaa121859] | committer: Michael Niedermayer

avcodec/ffv1dec: Fix a YUVA issue with remaping

Untested

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2471b22023756df145d24f9dcb00a56eaa121859
---

 libavcodec/ffv1dec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index 085dc5abe8..aeaf6a797b 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -364,7 +364,8 @@ static int decode_slice(AVCodecContext *c, void *arg)
             decode_plane(f, sc, &gb, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1, 2, 1, ac);
         }
         if (f->transparency)
-            decode_plane(f, sc, &gb, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], (f->version >= 4 && !f->chroma_planes) ? 1 : 2, 2, 1, ac);
+            decode_plane(f, sc, &gb, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], (f->version >= 4 && !f->chroma_planes) ? 1 : 2,
+                                                                                                          (f->version >= 4 && !f->chroma_planes) ? 1 : 3, 1, ac);
     } else if (f->colorspace == 0) {
          decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p->linesize[0]          , width, height, p->linesize[0], 0, 0, 2, ac);
          decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p->linesize[0] + (ps>>1), width, height, p->linesize[0], 1, 1, 2, ac);