A frequent mistake when playing a local video using [AVAudioPlayer initWithContentsOfURL:url] is to use URLWithString instead of fileURLWithPath.
URLWithString creates a url as is! i.e. it does not add a scheme.
fileURLWithPath creates a url with a file (file://) scheme.
A frequent mistake when playing a local video using [AVAudioPlayer initWithContentsOfURL:url] is to use URLWithString instead of fileURLWithPath to create the url. The player will report no error but the video will not play.
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