I’ve literally just got my Raspberry Pi 3 (Model B) today and set it up with OSMC but am experiencing problems getting it to play back any of my .rmvb files. They start to play, but there’s only audio - OSMC doesn’t even start rendering video - and playback stops after just a few seconds. I have a lot of .rmvb files and so far all seem to behave the same way. These files all playback fine on my Win10 PC. Is .rmvb supported in OSMC? How can I get these to play?
Add the following line: deb http://apt.osmc.tv jessie-devel main
Run the following commands to update: sudo apt-get update && sudo apt-get dist-upgrade && reboot
Your system should have have received the update.
Please see if the issue is resolved.
I also recommend you edit /etc/apt/sources.list again and remove the line that you added after updating. This will return you to the normal update channel.