avcodec/mjpegdec: fix len computation in ff_mjpeg_decode_dqt()

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

1 files changed, 1 insertions, 1 deletions

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index b3dc246391..1ce332833d 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -189,7 +189,7 @@ int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
                                  s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
         av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
                index, s->qscale[index]);
-        len -= 65;
+        len -= 1 + 64 * (1+pr);
     }
     return 0;
 }