rffmpeg error 1 about rffmpeg

[dudu7731]

for more information

the test with -version works well :

2023-08-21 19:43:19,903 - rffmpeg[203896] - INFO - Starting rffmpeg as /usr/local/bin/ffmpeg with args: -version
2023-08-21 19:43:19,903 - rffmpeg[203896] - DEBUG - Determining optimal target host
2023-08-21 19:43:19,903 - rffmpeg[203896] - DEBUG - Using SQLite as database.
2023-08-21 19:43:19,904 - rffmpeg[203896] - DEBUG - SQLite connection closed.
2023-08-21 19:43:19,904 - rffmpeg[203896] - DEBUG - Using SQLite as database.
2023-08-21 19:43:19,904 - rffmpeg[203896] - DEBUG - SQLite connection closed.
2023-08-21 19:43:19,904 - rffmpeg[203896] - DEBUG - Trying host ID 1 'pi3d'
2023-08-21 19:43:19,904 - rffmpeg[203896] - DEBUG - Running SSH test
2023-08-21 19:43:20,057 - rffmpeg[203896] - DEBUG - SSH test succeeded with retcode 0
2023-08-21 19:43:20,057 - rffmpeg[203896] - DEBUG - Selecting host as idle
2023-08-21 19:43:20,057 - rffmpeg[203896] - DEBUG - Found optimal host ID 1 'pi3d' (pi3d)
2023-08-21 19:43:20,057 - rffmpeg[203896] - INFO - Running command on host 'pi3d' (pi3d)
2023-08-21 19:43:20,057 - rffmpeg[203896] - DEBUG - Remote command: /usr/bin/ssh -q -t -o ConnectTimeout=1 -o ConnectionAttempts=1 -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ControlMaster=auto -o ControlPath=/run/shm/ssh-%r@%h:%p -o ControlPersist=300 -i /var/lib/jellyfin/.ssh/id_rsa pi3d /usr/lib/jellyfin-ffmpeg/ffmpeg -version
2023-08-21 19:43:20,057 - rffmpeg[203896] - DEBUG - Using SQLite as database.
2023-08-21 19:43:20,174 - rffmpeg[203896] - DEBUG - SQLite connection closed.
2023-08-21 19:43:20,270 - rffmpeg[203896] - DEBUG - Using SQLite as database.
2023-08-21 19:43:20,330 - rffmpeg[203896] - DEBUG - SQLite connection closed.
2023-08-21 19:43:20,330 - rffmpeg[203896] - INFO - Finished rffmpeg with return code 0

[dudu7731]

ok found, skipped this sentence :
Mount your media directories in the same location(s) as on the media server. If you exported them via NFS from your media server, use the process above only for those directories instead.

i had to export from my NAS storage instead of my jellyfin VM since my files are on this server.