How to get a (high quality) FLV version of your youtube video? - actionscript-3

I need to get a link of a FLV verion of a youtube video so I can play it in mobile, using Adobe Air (VideoTexture).
I'm currently using this library: https://github.com/myflashlab/AS3-youtube-parser-video-link
Which works, the only problem is that the only FLV version of the video I get has a 426x240 resolution, which is not acceptable. MP4 does have a 720p version but it's not displaying on iOS.
If anyone knows how to ask for/obtain the correct link to a FLV youtube video, would be great.

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I'm working on an Electronjs app that needs to play very large videos stored in the user's machine. I've tried both with the vanilla html5 video tag and with other players. Small videos load and play fine, but large ones (1GB and up) only play sound, not images.
<video controls width="1280" height="720">
<source src="F:\sample.MP4" type="video/mp4" />
Sorry, your browser doesn't support embedded videos.
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This happens both within the Electron app (Chromium based) and Chrome itself. Edge, on the other hand, plays large videos correctly.
I could not find any documentation on why this could happen, or if Chrome is behind in some video compatibilies...
Where could I look for a solution?
Thanks
Edit: The problem was not the size of the videos, but their codec, h264 played well, hevc (h265) didn't

#snwflk found the answer in the comments. It's because the hevc codec is not supported in Chrome: https://caniuse.com/#feat=hevc
Edge apparently supports it by offloading the video decoding to the hardware: H.265/HEVC web browser support
Maybe Electron can be compiled in a way that Chromium supports it? https://stackoverflow.com/a/39319614/3362074

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HTML5 video streaming - download

I read that the HTML5 video tag can't stream video...
By streaming i mean the possibility to download a video only from the middle of it and not from the beginning.
Apparently you can set the currentTime to the middle but in the background it will download all the movie.
On the other hand YouTube's HTML5 player seems to stream just fine.
What is it that I am missing?
Thanks...