OBS Video Stream & Latency Improvements

[x46085]

Added an example of streaming from OBS -> Elodin-DB -> Editor

Screencast.from.2026-02-12.23-35-03.webm

Latency is not zero, but this was a good first attempt at some optimizations.

Other fixes:

1. Editor performance -- Removed CPU rescaling, reuse GPU textures, non-blocking image channel (try_send), increased channel buffers
2. Latency -- sync=false on the SRT receiver pipeline only, reduced FRAMES_BEFORE_CONNECT from 30 to 5
3. Sequential delivery -- Added MsgLog::get_next_after() and modified handle_fixed_rate_msg_stream to deliver frames in order rather than sampling
4. Timestamp monotonicity -- Added last_written_ts guard in elodinsink to prevent backward timestamps after reconnects
5. Duplicate handler prevention -- Removed the Connecting state timeout to prevent creating multiple DB handlers
6. LoS overlay -- Changed from simulation-timestamp-based to wall-clock-based detection so brief decode failures don't trigger the overlay

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Note

Medium Risk
Moderate risk due to a large refactor of the editor’s video playback/decoding and new caching/seek logic that can impact memory use and playback correctness under live/reconnect conditions.

Overview
Adds end-to-end OBS Studio video streaming support via a new examples/video-stream flow (SRT receiver + test-pattern source) and documents the new video_stream schematic panel plus OBS setup guidance.

Reworks the editor’s video_stream implementation to be cache-driven (raw H.264 backfill via GetMsgs + live tail via FixedRateMsgStream), adds keyframe indexing + seek batches, reduces initial connect delay, and improves performance by reusing GPU textures and using non-blocking/buffered decoder channels.

Hardens elodinsink against reconnect edge cases by refreshing the DB base timestamp on first buffer and enforcing monotonic timestamps to prevent out-of-order frame writes.

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