fix: live stream HTTP 400 and missing title/author metadata

[Wubbity]

EDIT: Apologies to Devoxin, I accidentally deleted the repo I was working in which subsequently closed the PR. I've addressed your concerns and reopened it.

Summary

Two bugs that surface specifically with live streams and login-required content.

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1. HTTP 400 when initializing live stream playback

File: YoutubeMpegStreamAudioTrack.java

updateGlobalSequence() fetches the current segment on stream start to read the sequence number. YoutubePersistentHttpStream appends a &range=0-N query parameter to any URL that does not already contain an rn= parameter.

Live broadcast URLs carry noclen=1 and live=1. YouTube's live segment servers reject HTTP range requests with HTTP 400, so updateGlobalSequence() always fails for live streams and sequence tracking is broken.

Fix: when trackInfo.isStream is true, append rn=0 to the URL before passing it to YoutubePersistentHttpStream. The stream class skips the range logic for any URL that already contains rn=, so the request goes through as a plain fetch and returns HTTP 200.

A per-segment log.debug that fires every few seconds for the lifetime of any live stream is also removed and replaced with a single log.info line when playback begins.

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2. Missing title and author for TVHTML5 + OAuth responses

File: NonMusicClient.java

When a login-required video is loaded via the TV client with OAuth, the InnerTube player response returns a videoDetails object that contains videoId but omits title and author. The original code read videoDetails.title and videoDetails.author directly, so both fields come back null for this client/content combination.

Fix: two private static helper methods - extractTitle and extractAuthor - each try a cascade of known InnerTube response locations in order:

• videoDetails.title as a plain string (existing behaviour)
• videoDetails.title.simpleText (structured text node variant)
• videoDetails.title.runs[0].text (rich text node variant)
• microformat.playerMicroformatRenderer fields (TV client microformat)
• microformat.microformatDataRenderer fields (web client microformat)

If either field is still null after all InnerTube paths, fetchOEmbed is called as a last resort. This endpoint is public, requires no authentication, and returns title and author_name for any publicly accessible video including login-required content and live streams. It is called at most once per load and only when needed. The method now accepts a HttpInterface so requests go through the pre-configured source manager interface rather than bypassing it with a raw client.

Test plan

• Load a standard YouTube video - title and author extract via videoDetails as before, oEmbed not called
• Load a login-required video via the TV client with OAuth - title and author populate from microformat or oEmbed fallback
• Start a YouTube live stream - no HTTP 400 on initialization, playback begins, single INFO log line appears
• Verify log.debug("Segment URL: ...") no longer fires every segment during live stream playback

[Wubbity]

Closing to revise before re-submitting.