Add support for Bilibili international (and download subtitles)

Checklist

• I’m reporting a new site support request
• I’ve verified that I’m running youtube-dl version 2021.06.06
• I’ve checked that all provided URLs are alive and playable in a browser
• I’ve checked that none of the provided URLs violate any copyrights
• I’ve searched the bug tracker for similar site support requests including closed ones

Example URLs

• Single video: https://www.biliintl.com/en/play/35452
• Homepage: https://www.biliintl.com/

Description

Bilibili is like Youtube but in China. It also has an international site, which is used for Chinese animation and anime. The international version doesn’t have a search bar, and you can’t switch the subtitle on your own. “What’s Wrong with My Big Brother” is the series name of the example URLs. It was used as an example since it’s not geo-restricted. To get to my point, the Bilibili app on Android and iOS has more features such as switching subtitles, commenting and searching series. I’ve looked for many ways to switch the subtitle language to another one to download it, but it always ends up with the top one (when sorted by A-Z). Therefore, along with video downloading, I would like someone with great knowledge in this field to implement a multilanguage subtitle download solution. Note that Bilibili subtitles are usually in the JSON format (there is a converter for this) or CC and BCC (related repo).

[softsubs]

https://user-images.githubusercontent.com/46006210/138014304-c4fa2476-bbc5-4f7e-8edc-3ccc91b474c5.mp4 I will add a voice-over youtube video if this isn’t enough

@AdvMaple help me, I have installed tampermonkey+script and changed the domain to bilibili.tv but tampermonkey when I check ‘no scripts is running’ the script is enabled, how to make this script active when I open bilibili.tv . thank you

Open on issue in my repo, I don’t want to clutter ytdl with my script problem

@AdvMaple yes, I have checked your repo and the results are the same, can you share the steps in the form of a video, it really helped me, you can share it on youtube or something 😃

Bilibili also change their URL from: www.biliint.com to www.bilibili.tv . I’ve updated my script to match their change. You probably test my script when I haven’t known about these changes.

@AdvMaple yes, this is very valuable for a money 😃 . Thank you for your hard work and the results are very satisfying. I have tried and it works 😃

[AdvMaple]

https://user-images.githubusercontent.com/46006210/138014304-c4fa2476-bbc5-4f7e-8edc-3ccc91b474c5.mp4 I will add a voice-over youtube video if this isn’t enough