dsilhavy
commented
1 week ago @sreinus Do you see the same behavior in the nightly build? https://reference.dashif.org/dash.js/nightly/samples/dash-if-reference-player/index.html
Open sreinus opened 2 weeks ago
dsilhavy
commented
1 week ago @sreinus Do you see the same behavior in the nightly build? https://reference.dashif.org/dash.js/nightly/samples/dash-if-reference-player/index.html
Environment dash.js version: 4.7.4 Browser name/version: Chrome 128.0.6613.85 OS name/version: MacOS Sonoma 14.5
Steps to reproduce Start watching a live program. Seek a few minutes back from the live edge, causing the manifest file to change and a catchup player to start. Observe subtitle behavior during and after seeking.
Expected behavior Subtitles should continuously load and display correctly when seeking backwards in a live stream.
Actual behavior When seeking backwards, all subtitles are downloaded at once as observed in the network tab. However, no subtitles are displayed after the seek. Subtitles only reappear when the playing position reaches the timestamp where the original backward seek was performed.
Manifest `<?xml version="1.0" encoding="utf-8"?> <MPD xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:ns1="http://www.w3.org/2001/XMLSchema-instance" xmlns:cenc="urn:mpeg:cenc:2013" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011 DASH-MPD.xsd" profiles="urn:mpeg:dash:profile:isoff-live:2011,http://dashif.org/guidelines/dash-if-simple" maxSegmentDuration="PT6S" minBufferTime="PT6S" type="dynamic" publishTime="2024-09-17T08:31:24Z" timeShiftBufferDepth="PT6H0S" availabilityStartTime="2024-09-17T08:02:59Z" minimumUpdatePeriod="PT0S">
`
Settings
{ "debug": { "logLevel": 2, "dispatchEvent": false }, "streaming": { "abandonLoadTimeout": 10000, "wallclockTimeUpdateInterval": 100, "manifestUpdateRetryInterval": 100, "liveUpdateTimeThresholdInMilliseconds": 0, "cacheInitSegments": false, "applyServiceDescription": true, "applyProducerReferenceTime": true, "applyContentSteering": true, "eventControllerRefreshDelay": 100, "enableManifestDurationMismatchFix": true, "parseInbandPrft": false, "enableManifestTimescaleMismatchFix": false, "capabilities": { "filterUnsupportedEssentialProperties": true, "useMediaCapabilitiesApi": false }, "timeShiftBuffer": { "calcFromSegmentTimeline": false, "fallbackToSegmentTimeline": true }, "metrics": { "maxListDepth": 100 }, "delay": { "liveDelayFragmentCount": 4, "liveDelay": null, "useSuggestedPresentationDelay": true }, "protection": { "keepProtectionMediaKeys": false, "ignoreEmeEncryptedEvent": false, "detectPlayreadyMessageFormat": true }, "buffer": { "enableSeekDecorrelationFix": false, "fastSwitchEnabled": true, "flushBufferAtTrackSwitch": false, "reuseExistingSourceBuffers": true, "bufferPruningInterval": 10, "bufferToKeep": 20, "bufferTimeAtTopQuality": 30, "bufferTimeAtTopQualityLongForm": 60, "initialBufferLevel": null, "stableBufferTime": 24, "longFormContentDurationThreshold": 600, "stallThreshold": 0.3, "useAppendWindow": true, "setStallState": true, "avoidCurrentTimeRangePruning": false, "useChangeTypeForTrackSwitch": true, "mediaSourceDurationInfinity": true, "resetSourceBuffersForTrackSwitch": false }, "gaps": { "jumpGaps": true, "jumpLargeGaps": true, "smallGapLimit": 1.5, "threshold": 0.3, "enableSeekFix": true, "enableStallFix": false, "stallSeek": 0.1 }, "utcSynchronization": { "enabled": true, "useManifestDateHeaderTimeSource": true, "backgroundAttempts": 2, "timeBetweenSyncAttempts": 30, "maximumTimeBetweenSyncAttempts": 600, "minimumTimeBetweenSyncAttempts": 2, "timeBetweenSyncAttemptsAdjustmentFactor": 2, "maximumAllowedDrift": 100, "enableBackgroundSyncAfterSegmentDownloadError": true, "defaultTimingSource": { "scheme": "urn:mpeg:dash:utc:http-xsdate:2014", "value": "https://time.akamai.com/?iso&ms" } }, "scheduling": { "defaultTimeout": 500, "lowLatencyTimeout": 0, "scheduleWhilePaused": false }, "text": { "defaultEnabled": true, "dispatchForManualRendering": true, "extendSegmentedCues": true, "imsc": { "displayForcedOnlyMode": false, "enableRollUp": true }, "webvtt": { "customRenderingEnabled": false } }, "liveCatchup": { "maxDrift": null, "playbackRate": { "min": null, "max": null }, "playbackBufferMin": 0.5, "enabled": null, "mode": "liveCatchupModeDefault" }, "lastBitrateCachingInfo": { "enabled": true, "ttl": 360000 }, "lastMediaSettingsCachingInfo": { "enabled": true, "ttl": 360000 }, "saveLastMediaSettingsForCurrentStreamingSession": true, "cacheLoadThresholds": { "video": 50, "audio": 5 }, "trackSwitchMode": { "audio": "alwaysReplace", "video": "neverReplace" }, "selectionModeForInitialTrack": "highestSelectionPriority", "fragmentRequestTimeout": 20000, "fragmentRequestProgressTimeout": -1, "manifestRequestTimeout": 10000, "retryIntervals": { "MPD": 2000, "XLinkExpansion": 500, "MediaSegment": 1000, "InitializationSegment": 1000, "BitstreamSwitchingSegment": 1000, "IndexSegment": 1000, "FragmentInfoSegment": 1000, "license": 1000, "other": 1000, "lowLatencyReductionFactor": 10 }, "retryAttempts": { "MPD": 10, "XLinkExpansion": 1, "MediaSegment": 3, "InitializationSegment": 3, "BitstreamSwitchingSegment": 3, "IndexSegment": 3, "FragmentInfoSegment": 3, "license": 3, "other": 3, "lowLatencyMultiplyFactor": 5 }, "abr": { "movingAverageMethod": "slidingWindow", "ABRStrategy": "abrDynamic", "additionalAbrRules": { "insufficientBufferRule": true, "switchHistoryRule": true, "droppedFramesRule": true, "abandonRequestsRule": true }, "abrRulesParameters": { "abandonRequestsRule": { "graceTimeThreshold": 500, "abandonMultiplier": 1.8, "minLengthToAverage": 5 } }, "bandwidthSafetyFactor": 0.9, "useDefaultABRRules": true, "useDeadTimeLatency": true, "limitBitrateByPortal": false, "usePixelRatioInLimitBitrateByPortal": false, "maxBitrate": { "audio": -1, "video": -1 }, "minBitrate": { "audio": -1, "video": -1 }, "maxRepresentationRatio": { "audio": 1, "video": 1 }, "initialBitrate": { "audio": -1, "video": -1 }, "initialRepresentationRatio": { "audio": -1, "video": -1 }, "autoSwitchBitrate": { "audio": true, "video": true }, "fetchThroughputCalculationMode": "abrFetchThroughputCalculationMoofParsing" }, "cmcd": { "enabled": false, "sid": null, "cid": null, "rtp": null, "rtpSafetyFactor": 5, "mode": "query", "enabledKeys": [ "br", "d", "ot", "tb", "bl", "dl", "mtp", "nor", "nrr", "su", "bs", "rtp", "cid", "pr", "sf", "sid", "st", "v" ] }, "cmsd": { "enabled": false, "abr": { "applyMb": false, "etpWeightRatio": 0 } } }, "errors": { "recoverAttempts": { "mediaErrorDecode": 5 } } }