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Old 07-03-2019, 10:21 PM   #4
Liverpool TV
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Join Date: Nov 2013
Location: Liverpool, England.
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Don't forget, this is not simply a file extension. While MP4 and M4V are very similar and I dare say that one is based on the other, they are not file extensions they are media containers/wrappers.

Some players, hardware and software, will look beyond the file extension and see the stream properties/types and transport types etc. and some will recognise what they are despite the file extension and play them. This is what's happened when you changed the file extension. Maybe try the changed file extension version on your TV and see if it sees it.

You get the same sometimes with other file types, like text files, where the wrong file extension may still work.

In any event, you will definitely find things that wont play something with the wrong extension. Unless M4V is an absolute must, MP4 is the way safer one to use.
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