I've downloaded a few movies in mp4 and mkv format.
When I look at the properties of some of them, I see that the language of the audio stream is set to "Undefined", and not "English", while the movie itself is in English.
I tried to change this using File Properties in Windows 8.1, but the only things I can change there are "Director", "Producer", etc, and not the audio streams.
(just to clarify, I want to change the audio stream properties, not the audio itself)
Is there a program that can do this?
- I'd prefer if it has a GUI, but CLI should also be fine (as long as it isn't too complicated).
- It should save the changes directly to the original file, no converting required.
- And, of course, it has to be gratis (open-source not required, but preferred).