Ubuntu – Ubuntu 18.04 bluetooth low volume

Possible workaround for the sync problem: mplayer has a command-line option to adjust the delay between sound an image, so you could regain sync this way.

The command would be mplayer -delay X /path/to/videofile where X is the delay in seconds. Negative values of X mean that the image will be delayed, and positive values mean the sound will be delayed.

I finally found a solution (in fact several one):

1. Add threadirqs to my kernel params
2. was better, but this was not enough, I also had to install rtirq-init

I then had an (almost) perfect bt sound playback.

Another option seems to use linux-lowlatency kernel. I still have to test this, but it should work. What is unclear is the drackbacks (power consumption ?).