Add LastKeyframeGapMs to MP4 state and update fragment-flush logic to consider the previous keyframe gap before forcing a fragment boundary. Previously any unexpectedly short keyframe gap (< MinNormalGOPMs) would force a flush, which could cascade on streams that legitimately emit short GOPs. Now we only force a flush when the current gap is short and the prior gap was healthy (or unset), and we record the current gap for future checks. Also refactor the check to use a local gap variable and preserve the existing log message.
Add a MinNormalGOPMs constant (950 ms) and use it to detect unusually close consecutive IDRs; when a keyframe arrives sooner than this threshold and the current fragment is still short, force a fragment flush to isolate the seam and avoid mid-fragment sync samples. Replace the previous hardcoded 500 ms check in mp4.go and add TestMP4LoopSeamIsolation to reproduce the loop-seam pattern and assert that seam IDRs are isolated into their own fragments.
Track LastKeyframeRawPTS and force a fragment flush when two consecutive keyframes on the video track arrive unexpectedly close (<500ms). This detects upstream loop/restart discontinuities (e.g. ffmpeg stream_loop seams) where a fresh IDR would otherwise become a mid-fragment sync sample and cause MSE players to reject the fragment. Emits a warning when triggered and updates LastKeyframeRawPTS for video samples. Also add a sample MP4 file to machinery/data.
Guard against large forward PTS/DTS jumps that can occur when looping source MP4s or when upstream RTSP/ffmpeg inserts offsets/stalls. In flushPendingVideoSample() clamp an excessively large video sample duration to a plausible ceiling (1s hard cap, or LastVideoSampleDTS*10 if smaller), falling back to LastVideoSampleDTS or 33ms, and log a warning. In AddSampleToTrack() clamp audio sample durations if the new dts is >10x the previous audio DTS and log a warning. These changes prevent huge sample durations that cause trun/sidx/mvhd discontinuities and browser playback errors.
Add trailing commas to the arguments passed to fallbackToSDLiveview in ui/src/pages/Dashboard/Dashboard.jsx. This is a non-functional formatting change applied to the WebRTC initialization, ICE candidate handling, and connection-state fallback calls to align with the project's code style/formatter.
Clean up trailing commas and minor formatting in ui/src/pages/Dashboard/Dashboard.jsx. Adjusts object/argument commas and formatting around WebRTC message handling, peer connection setup, error handling, and SD liveview fallback callbacks to avoid potential syntax/lint issues.
Apply consistent formatting to ui/src/pages/Dashboard/Dashboard.jsx by adding trailing commas in object literals, function call argument lists, and callbacks (primarily around WebRTC handling and error messages). This is a non-functional style change to match the project's code style (e.g., Prettier/ESLint) and should not affect runtime behavior.
Remove the uuidv4 import and introduce a local createUUID helper that uses window.crypto.randomUUID when available and falls back to a v4-style generator. Update webrtcClientId and webrtcSessionId to use createUUID(), removing the external dependency while preserving UUID generation for WebRTC session/client IDs.
Add trailing commas to multi-line function calls and RTCPeerConnection instantiation in Dashboard.jsx for consistent formatting. In Media.scss remove an extra blank line and relocate the .media-filters__field:first-child rule to consolidate related styles. Purely stylistic/organizational changes with no intended behavior change.
Reformat code in ui/src/pages/Media/Media.jsx for readability: wrap long argument lists (getTimestampFromInput, buildEventFilter) and reflow the appliedFilter ternary onto multiple lines. Also add the missing trailing newline to ui/public/locales/en/translation.json. No functional changes.
Switch MQTT client to persistent sessions by setting CleanSession to false, enabling ResumeSubs and using an in-memory store. Previously CleanSession was true and resume/store were commented out, which could drop subscriptions on reconnect; these changes ensure subscriptions are preserved across reconnects and re-subscribed from memory.
Introduce structured WebRTC handshake signaling and client-side fallbacks. Changes:
- machinery: replace HandleLiveHDHandshake channel to carry LiveHDHandshake (payload + signaling callbacks) and expose active WebRTC reader count in dashboard data.
- routers: MQTT and WebSocket handlers now send/receive LiveHDHandshake structs; websocket supports stream-hd and webrtc-candidate messages and uses callback-based signaling to reply over the WS connection.
- webrtc: add helper functions to send MQTT or callback answers/candidates, adapt InitializeWebRTCConnection to the new handshake type, and expose GetActivePeerConnectionCount.
- utils: minor GetMediaFormatted filtering fix and unit test for timestamp range behavior.
- ui: Dashboard gains native WebRTC liveview with fallback to SD image stream, shows active listener count, and handles signaling/candidates; Media page adds datetime range filters, infinite-scroll append behavior, and styles; reducer/action updates to support appending events; package.json scripts disable ESLint plugin during start/build/test.
These changes enable browser-based HD liveviews with dual signaling paths (websocket callbacks or MQTT), improve media filtering, and provide graceful fallback to SD streaming when WebRTC fails.
Increase HD handshake channel buffer and harden signaling flow: enlarge HandleLiveHDHandshake buffer from 10 to 100 and add a nil-check to drop and log requests when the channel is not initialized. Add publishSignalingMessageAsync to publish MQTT messages with timeout and error logging, and replace blocking Publish().Wait() calls for ICE candidates and SDP answers with the async publisher. Reintroduce the remote-candidate processor goroutine after remote description handling to avoid AddICECandidate races. These changes reduce blocking, improve error handling, and make WebRTC/MQTT signaling more resilient.
