ios - iPhone No volume control shows up on specific phone when using MPMoviePlayerController -

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we've written app uses mpmovieplayercontroller play movies streamed server. works fine on bunch of devices own (2 ipads, 3 iphones) , few others @ our customer site 1 particular japanese fellow, gets no sound , no volume control?

any suggestions?

ps did ask him reboot phone , has vibrate switch off

ok pay ask silly questions second time. did have vibrate switch on. question why youtube app doesn't remove volume controls when happens , our app need research now.


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