Get highest resolution possible thumbnail

[Iwaslazkis]

Currently, the extension only looks for the HQ quality thumbnail:

browser-playerctl/extension/providers/youtube.js

Line 56 in ac63dc7

"mpris:artUrl": `https://i.ytimg.com/vi/${id}/hqdefault.jpg`,

Some videos don't have a thumbnail at that quality, and others have better quality thumbnails. It'd be nice to pick out the highest quality one possible.

[Iwaslazkis]

It seems that i.ytimg.com returns a 404 status code along with a grey box image when the corresponding thumbnail resolution doesn't exist; perhaps we can have the browser query the each possible resolution in descending order and take whichever one return a 200 status code first?

[Iwaslazkis]

From this short article, it seems that these are all the available resoltutions for the thumbnail:

1. https://i.ytimg.com/vi/<video_id>/default.jpg
   Dimensions: 120x90
   This is the default resolution (lowest available).

2. https://i.ytimg.com/vi/<video_id>/mqdefault.jpg
   Dimensions: 320x180
   This is called a medium size thumbnail.

3. https://i.ytimg.com/vi/<video_id>/hqdefault.jpg
   Dimensions: 480x360
   This is called a high size thumbnail.

4. https://i.ytimg.com/vi/<video_id>/sddefault.jpg
   Dimensions: 640x480
   This is called a standard size thumbnail.

5. https://i.ytimg.com/vi/<video_id>/maxresdefault.jpg
   Dimensions: 1280x720
   This is the maximum resolution available.