workaround for broken flvtoolized files

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8277 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/flvdec.c

@@ -230,6 +230,12 @@ static int flv_read_header(AVFormatContext *s,
 
     url_fskip(&s->pb, 4);
     flags = get_byte(&s->pb);
+    /* old flvtool cleared this field */
+    /* FIXME: better fix needed */
+    if (!flags) {
+        flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
+        av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
+    }
 
     if(flags & FLV_HEADER_FLAG_HASVIDEO){
         st = av_new_stream(s, 0);