[FFmpeg-cvslog] Do not try to parse empty strf tags.

[Carl Eugen Hoyos]

ffmpeg | branch: master | Carl Eugen Hoyos <cehoyos at ag.or.at> | Tue Oct 18 03:29:41 2011 +0200| [39f6733f0593064ae5148dd6484f1d7c74d7cae5] | committer: Carl Eugen Hoyos

Do not try to parse empty strf tags.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=39f6733f0593064ae5148dd6484f1d7c74d7cae5
---

 libavformat/avidec.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 9e75ee2..05602d8 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -570,6 +570,8 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
             break;
         case MKTAG('s', 't', 'r', 'f'):
             /* stream header */
+            if (!size)
+                break;
             if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
                 avio_skip(pb, size);
             } else {