Hello
Sorry for the lack of information

Logitech Media Server Version : 7.9.2 - 1559133196 @ Thu May 30 19:34:15 CEST 2019
Nom d'hôte : kermusic
Adresse IP du serveur : 192.168.0.95
Port HTTP du serveur : 9000
Système d'exploitation : Debian - FR - utf8
Architecture de la plate-forme : x86_64-linux
Version de Perl : 5.24.1 - x86_64-linux-gnu-thread-multi
Audio::Scan : 0.95
IO::Socket::SSL : 2.044
Version de la base de données : DBD::SQLite 1.58 (sqlite 3.22.0)

and the result
[19-09-02 20:29:13.1049] Slim::Player::StreamingController:layerEndOfStream (2287) 00:04:20:06:40:0e
[19-09-02 20:29:13.1058] Slim::Player::StreamingController::_setPlayingStat e (2378) new playing state PLAYING
[19-09-02 20:29:13.1063] Slim::Player::StreamingController::_Playing (369) Song 0 has now started playing
[19-09-02 20:29:13.1074] Slim::Player::StreamingController::_Playing (398) Song queue is now 0
[19-09-02 20:29:13.1619] Slim::Player::StreamingController:layerReadyToStream (2219) 00:04:20:06:40:0e
[19-09-02 20:29:13.1626] Slim::Player::StreamingController::_setStreamingSt ate (2387) new streaming state IDLE
[19-09-02 20:29:13.1635] Slim::Player::StreamingController::nextsong (890) The next song is number 0, was 0
[19-09-02 20:29:13.2429] Slim::Player::TranscodingHelper::getConvertCommand 2 (443) Error: Didn't find any command matches for type: rtlfm

Plugin rtlfm is activate in plugin list

rtl_fm is working test on the same frequency in command line

in my favorite squeezecenter i have rtlfm:104.3M

if you have an idea of what i do wrong

Many thanks