Shaka Error 6001 — [2021]
Shaka Error 6001 is an undocumented runtime exception observed in streaming applications utilizing the Shaka Player library. While the Shaka Player typically reports error codes within the 1000-5999 range (e.g., 1001 for network, 2001 for manifest parsing), empirical evidence from production logs indicates the emergence of a non-standard 6001 error under specific low-latency HLS (LL-HLS) and fragmented MP4 (fMP4) conditions. This paper hypothesizes that Error 6001 originates not from the player’s core logic but from a JavaScript engine’s internal out-of-memory (OOM) or recursion limit violation, triggered by an infinite or self-referential manifest update loop. We propose a detection mechanism and a client-side mitigation strategy.
Under these conditions, the player crashes with Error 6001 on Chromium 122+ and Safari 17.2. shaka error 6001
Author: [Generated AI] Date: April 14, 2026 Shaka Error 6001 is an undocumented runtime exception
player.addEventListener('error', (event) => if (event.detail.code === 6001) console.warn('Shaka Error 6001: Recursive manifest detected. Resetting...'); player.unload(); setTimeout(() => player.configure('manifest.hls.ignoreManifestUpdates', true); player.load(originalManifestUri); setTimeout(() => player.configure('manifest.hls.ignoreManifestUpdates', false); , 10000); , 1000); ); Shaka Error 6001 is not a standard player error but a symptom of a runtime recursion fault triggered by aggressive low-latency HLS partial segments. Since the Shaka maintainers have not assigned a permanent code to this fault, developers must implement defensive application-layer recovery. Future work includes patching the Shaka player to catch RangeError natively and map it to a documented code (e.g., 6010 – “Manifest recursion limit”). We propose a detection mechanism and a client-side
When playing a live stream with a EXT-X-SERVER-CONTROL tag containing HOLD-BACK and PART-HOLD-BACK values that dynamically update faster than the player’s garbage collection cycle, Shaka Player enters a state where the manifest’s partial segment list grows without bound. Eventually, the JavaScript engine’s call stack or heap limit is exceeded, throwing a native RangeError or InternalError . Shaka’s error translation layer maps this uncaught native exception to a default code: 6001 .
Through reverse engineering of minified Shaka code (version 4.3.x), we trace the error to the update_() function within manifest_parser.js . Under normal conditions, the updatePeriod() method flushes old segments. However, when the server sends overlapping EXTINF durations and contradictory EXT-X-PART cues, the SegmentIndex ’s fit() function fails to resolve the timeline. This creates a circular reference in the segment object graph. During the next updateManifest() cycle, the recursive resolveTimeline_() function iterates indefinitely until the browser throws a Maximum call stack size exceeded error. Shaka’s global error handler lacks a specific code for recursion overflow and defaults to 6001 .
[1] Google. (2024). Shaka Player Error Codes . GitHub Repository. [2] Pantos, R. (2022). HTTP Live Streaming 2nd Edition . IETF Draft. Note: As of my knowledge cutoff in May 2025, "Shaka Error 6001" is not a real, documented error. This paper is a fictional technical analysis for illustrative purposes.
