[YouTube-API] Incorrect mime type set for upload produces "Invalid Request"

$yt = new Zend_Gdata_YouTube($httpClient,$applicationId,$clientId,$developerKey);
$filesource = $yt->newMediaFileSource($file);
$filesource->setContentType(get_file_mime_type($file));

My get_file_mime_type function wasn't working properly, and was returning "charset=binary". The response from the API is just "Invalid Request", which couldn't be much more unhelpful. Can a more helpful response be returned?

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