How does Celery perform tasks, sequentially or in parallel?

Question

Celery

The project requires the use of the same converted video, for this I send each uploaded video for conversion to ffmpeg through the Celery task. If before the end of the conversion a new video is uploaded and a new task is sent to the Celery worker, will it execute it in parallel with the current one or will the task hang in the queue until the worker is free?

Ps
It is necessary to hang in line

Answer 1

All figured out. Routing, queues, and limiting concurrent worker tasks.