Demuxers with AVFMT_NOFILE will open a (possibly different) file themselves, so do not probe them if is_opened is set.
Demuxers with AVFMT_NOFILE will open a (possibly different) file themselves,
so do not probe them if is_opened is set.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@7589 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg