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I may not have explained myself well. If I download the same movie on the same device (the one where I can't hear the audio in Echogram) and play it with Just (video) Player, it plays perfectly. What I'm trying to find out is if, using the same playback engine (Exoplayer) in both Echogram and Just (video) Player, the lack of audio is a bug in the app.
I also tried to explain that it's not a device problem because I use Echogram on a Google Pixel with Android 17 and on a TCL NextPaper with Android 15, and the same problem occurs in both cases.