OGG demuxer: ensure that there's pages to read for duration calculation in

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@18523 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index 28dc56eeb93b1d121dd76560e33921b944932a81..5362489f5c48cb9850a9ca8f1c64d37e89bfdafd 100644 (file)
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -450,7 +450,7 @@ ogg_get_length (AVFormatContext * s)
     size = url_fsize(s->pb);
     if(size < 0)
         return 0;
-    end = size > MAX_PAGE_SIZE? size - MAX_PAGE_SIZE: size;
+    end = size > MAX_PAGE_SIZE? size - MAX_PAGE_SIZE: 0;
 
     ogg_save (s);
     url_fseek (s->pb, end, SEEK_SET);