[LAU] FFMPEG - Recording sound from jack

Hello. Debian 9 - Stretch. ffmpeg version 3.2.5-1 I run Jackd from Qjackctl jackd2 1.9.10+20150825git1ed50c92~dfsg-5 cat /proc/asound/cards 1 [AVB ]: USB-Audio - UltraLite AVB MOTU UltraLite AVB at usb-0000:00:1a.7-5, high speed aplay -l **** Liste des Périphériques Matériels PLAYBACK **** carte 1: AVB [UltraLite AVB], périphérique 0: USB Audio [USB Audio] Sous-périphériques: 0/1 Sous-périphérique #0: subdevice #0 When i try to record my screen i use : ffmpeg -f x11grab -s 1920x1080 -r 25 -i :0.0 00screencast.mp4 And it's working great. But, when i try to add the sound.... no success ffmpeg -f alsa -ac 2 -i hw:1 -f x11grab -s 1920x1080 -r 25 -i :0.0 00screencast.mp4 [alsa @ 0x563a80c18b60] cannot open audio device hw:1 (Device or resource busy) hw:1: Input/output error arecord -l **** Liste des Périphériques Matériels CAPTURE **** carte 1: AVB [UltraLite AVB], périphérique 0: USB Audio [USB Audio] Sous-périphériques: 0/1 Sous-périphérique #0: subdevice #0 arecord -L null Discard all samples (playback) or generate zero samples (capture) default jack sysdefault:CARD=AVB UltraLite AVB, USB Audio Default Audio Device front:CARD=AVB,DEV=0 UltraLite AVB, USB Audio Front speakers surround21:CARD=AVB,DEV=0 UltraLite AVB, USB Audio 2.1 Surround output to Front and Subwoofer speakers surround40:CARD=AVB,DEV=0 UltraLite AVB, USB Audio 4.0 Surround output to Front and Rear speakers surround41:CARD=AVB,DEV=0 UltraLite AVB, USB Audio 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=AVB,DEV=0 UltraLite AVB, USB Audio 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=AVB,DEV=0 UltraLite AVB, USB Audio 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=AVB,DEV=0 UltraLite AVB, USB Audio 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers iec958:CARD=AVB,DEV=0 UltraLite AVB, USB Audio IEC958 (S/PDIF) Digital Audio Output dmix:CARD=AVB,DEV=0 UltraLite AVB, USB Audio Direct sample mixing device dsnoop:CARD=AVB,DEV=0 UltraLite AVB, USB Audio Direct sample snooping device hw:CARD=AVB,DEV=0 UltraLite AVB, USB Audio Direct hardware device without any conversions plughw:CARD=AVB,DEV=0 UltraLite AVB, USB Audio Hardware device with all software conversions ffmpeg -f alsa -ac 2 -i plughw:1 -f x11grab -s 1920x1080 -r 25 -i :0.0 test.mp4 [alsa @ 0x55be84165b60] cannot open audio device plughw:1 (Device or resource busy) plughw:1: Input/output error Any advices, feeback, experiences.... ? All the best.