Significant delay after 1st ftp upload

[jimsmt]

Hi, thanks for this great project, however I'm facing some problem.

Every time after restarting ipcam2mqtt, the 1st ftp upload will always trigger the "Motion detected" message instantly, but then there will be 5-20 seconds delay between the time when camera uploaded image and the ipcam2matt "motion detected" message.

And the -v debug or --verbosity debug parameter doesn't work, so I can't get more debug info