Download temporary direct YouTube media links in chunks

[ritiek]

• I've verified and I assure that I'm running youtube-dl 2018.08.04
• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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In the recent past, YouTube began throttling download speeds which was workaround in #15271 (comment) by downloading the media in chunks. This works well when passing YouTube video URL, for example this command downloads without any speed throttle:

$ youtube-dl https://www.youtube.com/watch?v=AOeY-nDp7hI -x

but the speed throttling comes back if using (temporary) direct YouTube media link, for example this throttles:

$ youtube-dl https://r5---sn-ci5gup-pmjs.googlevideo.com/videoplayback?sparams=clen%2C...

It would be nice if youtube-dl could automatically detect if such given URLs belong to YouTube and enable chunk based downloading so these direct URLs won't throttle either.

You could confirm the throttling using this general command:

$ youtube-dl -o "my_song.%(ext)s" $(youtube-dl https://www.youtube.com/watch?v=AOeY-nDp7hI -x -g)

My use case is that sometimes, I only have access (temporary) direct YouTube media link and I need to quickly download a video/audio to local but the throttling increases download times by a big factor. :(

[dstftw]

You should not use temporary links directly in the first place. Even if you use (you must also pass cookies and headers) you can enforce this option manually.
Bare temporary URL is not enough to decide whether it will be throttled or not.