Do not return invalid pointer for non-audio or video streams. Patch by Sam Hocevar sam+ffmpeg zoy org
Do not return invalid pointer for non-audio or video streams.
Patch by Sam Hocevar sam+ffmpeg zoy org


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@8564 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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