avfilter: Properly check for failed format query
authorDerek Buitenhuis <derek.buitenhuis@gmail.com>
Thu, 2 Oct 2014 10:55:52 +0000 (11:55 +0100)
committerDerek Buitenhuis <derek.buitenhuis@gmail.com>
Thu, 2 Oct 2014 11:22:49 +0000 (12:22 +0100)
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

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