Your English is fine, don't worry about it

...
I am sure something will happen to flash... it will be interesting to see if you get a reply here...
But what do you mean "transcoding does not work on a linutop serveur"?
edit: I have taken a look at
Linutop [link] and it is a Ubuntu Linux derivative.
I am running Subsonic on both a Windows, and a Debian Linux as well as an Ubuntu Linux server; transcoding very much works perfectly on all platforms.
In fact some formats must be transcoded, like FLAC, therefore as far as I can see, it makes no sense to get rid of transcoding.
Just follow the installation descriptions for Ubuntu,
provided on the main page [link],
and you should be able to transcode just fine. You must remember to put sudo in front of every command, so that it gets you superuser rights.
It is also worthy of mention that if you are running this from a bootable USB stick, it is plausible that your changes, to Linutop, are not saved on the USB. When you reboot
the device, you might loose all your changes to the Linux installation on the USB-stick. Therefore you will have to install Linutop to a hardrive to allow for persistent changes. This is common for most if not all USB-bootable OS'es, because the filesystem is running from a ramdrive which gets instantly deleted on every power cycle.