avcodec/mjpegdec: fix decoding 4th plane

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 67b27e1474958719e90838acb8bc212025b1189a..c0792281bcc537a891ba6d7fb9a21b72e8205a30 100644 (file)
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -497,7 +497,7 @@ unk_pixfmt:
     s->picture_ptr->key_frame = 1;
     s->got_picture            = 1;
 
-    for (i = 0; i < 3; i++)
+    for (i = 0; i < 4; i++)
         s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
 
     av_dlog(s->avctx, "%d %d %d %d %d %d\n",