Today, after the OTA-13 update, I have tried again with a couple of MKV video
One of them plays good, the other not. The difference is that the file that
doesn't plays has an AC3 audio track, the other not.
So, I believe that actually the problem is the audio format, and not the video.
I think that currently Ubuntu Touch has a problem with the AC3 audio format.
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MKV video files doesn't play on phone and tablet
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