Can I use existing / predownloaded files?

[ChaosNicro]

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Description of your issue, suggested solution and other information

Due to the restrictions where I live, I cannot use youtube-dl to download my videos without receiving an error. I can however use a different method to download the components from youtube in a similar fashion.

My current situation is that I have an mp4 video component and an mp4a audio component.
I would now like to use youtube-dl to merge the two components into a complete video as well as manipulate the naming scheme for the files.

Thus my question is: "How can I use pre-downloaded components in post-processing?

I know that the usual information available on the web-page cannot be used but a "hacky" solution for the merge and basic features might be using any URL and naming the existing components identical to the download results. The download would then be skipped and the existing files would be used instead.

Even if this is the most simple solution, I would still like some guidance on how to do this and what to name the files.

Thank you very much in advance,
-Nicro

[dstftw]

With only video and audio component that is not possible. You'll need info JSON as well obtained with --write-info-json. Then on restricted machine you can run youtube-dl with --load-info path/to/info.json and it will do muxing.
Or just use ffmpeg/avconv.
You can also workaround restrictions using --proxy.