Create DASH manifest on the fly

[stonerl]

Guidelines

• I have searched the issue tracker and I haven't found feature request like this

Type

New feature

Describe the feature

It took me some time to understand where all the playback issues, especially with Piped come from. ATM, a video and audio stream is directly fed into mpv.

Instead, we should create a DASH manifest on the fly and feed this to the player. Especially this part in the manifest is vital:

<SegmentBase indexRange="701-2244">
    <Initialization range="0-700"/>
</SegmentBase>

This tells mpv where to find the segments for a video, which should speed up seeking and scrubbing, and should make it way more robust.

This could potentially solve issues like these: #626, #591, #590, #588, #585, #498, #487, #400, #231, #55

The Piped and Invidious API provide all the necessary keys. The Invidious API even provides a DASH manifest, but it only contains two formats, AVC1 and AV1.

[stonerl]

Some JavaScript examples for creating a DASH manifest:

• https://github.com/TeamPiped/Piped/blob/master/src/utils/DashUtils.js
• https://github.com/bonswouar/poolparty/blob/master/public/js/dash-utils.js

[stonerl]

found another way