sendQuitSignal's onFinish called before finishing exporting frames

[nzackoya]

I'm trying to remove the frames once sendQuitSignal has been called, but some files still there after I remove files onFinish.

Here is the command I'm running:

-i path.mp4 -r 25 -pix_fmt yuvj422p -q:v 1 path_%04d.jpg.