videos won't play and seem to load forever linuz

After a lot a searching I found out that when the jack server is crashed ( control with Cadence),  this endless buffering occurs.  Restarting Jack with cadence solves the problem.

No sound in webbrowser using Pulse audio and jack server

Suddenly no sound when playing some sound in Firefox.
First be sure to play some sound in the webbrowser.
Then open pavucontrol in terminal. Check in the "Playblack"tab if Audiostream is on.
The problem was that the HDMI output of the monitor was chosen in stead of the Jack sink.

convert flac to ape

Why would you do that? ", you may ask. Well, I won't explain. But I needed it to be able to help some people.
With soundconverter you can convert from flac to ape, but not the other way around, from flac to ape.
The solution I found in caudec (AUR).
This command line tool can be used as follows:
caudec -c ape  -q 1 soundfile.flac
You can use 5 different levels: compression level for MonkeysAudio must be a number between 1 and 5, or one of fast (1), normal, high, extra, insane(5).
Without the  -q handle you will get level 2, normal. All levels are lossless; the higher level takes more time and gives more compression.

No sound with mpv using jack server

To connect mpv with the jack server put this line:
ao= jack

in /home/username/.config/mpv/ mpv.conf