Run youtube-dl in idle mode [feature request]

[keshavbhatt]

Checklist

• [✔ ] I'm reporting a feature request
• [✔ ] I've verified that I'm running youtube-dl version 2020.01.24
• [✔ ] I've searched the bugtracker for similar feature requests including closed ones

Description

I use youtube-dl in one of my c++ project, which is basically a GUI to play music from youtube. I wish if i was able to run youtube-dl in idle mode, where main process after starting youtube-dl could stay opened there to take more request.

Currently youtube-dl takes a request to process it, and need a new instance of process to have another request as i investigated using it. It can take tasks in batch but will need a new process to take another batch.

A suggestion how it could be implemented:
Youtube-dl take tasks and provide result with the index of task it processed.

Example:
youtube-dl --idle {[url]s}

Result:

[task 0] {result}
[task 1] {result}
[task 2] {result}