[FFmpeg-cvslog] lavf/mxfdec: Limit score for files with run-in.

[Carl Eugen Hoyos]

ffmpeg | branch: master | Carl Eugen Hoyos <ceffmpeg at gmail.com> | Mon Aug 24 21:37:00 2020 +0200| [3092a53cbc48252d29007177205f599c9c6f8769] | committer: Carl Eugen Hoyos

lavf/mxfdec: Limit score for files with run-in.

Only return AVPROBE_SCORE_MAX if the header partition pack key
is at the start of the file.
Fixes ticket #8846.

Reviewed-by: Tomas Härdin

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3092a53cbc48252d29007177205f599c9c6f8769
---

 libavformat/mxfdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index 4b56984b77..3a090147a0 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -3615,7 +3615,7 @@ static int mxf_probe(const AVProbeData *p) {
                 AV_RN32(bufp+ 4) == AV_RN32(mxf_header_partition_pack_key+ 4) &&
                 AV_RN32(bufp+ 8) == AV_RN32(mxf_header_partition_pack_key+ 8) &&
                 AV_RN16(bufp+12) == AV_RN16(mxf_header_partition_pack_key+12))
-                return AVPROBE_SCORE_MAX;
+                return bufp == p->buf ? AVPROBE_SCORE_MAX : AVPROBE_SCORE_MAX - 1;
             bufp ++;
         } else
             bufp += 10;