Subtitles not loading correctly when seeking backwards in live stream

[sreinus]

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"> <Period id="p0" start="PT0S"> <AdaptationSet mimeType="video/mp4" segmentAlignment="true" startWithSAP="1"> <ContentProtection schemeIdUri="urn:mpeg:dash:mp4protection:2011" value="cenc" cenc:default_KID="60d1cd8a-4ea3-51bb-8790-13f7ff1c4631" /> <ContentProtection value="Widevine" schemeIdUri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed"> 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<Representation id="T1" bandwidth="4000" codecs="wvtt"/> </AdaptationSet> <AdaptationSet mimeType="image/jpeg" contentType="image"> <SegmentTemplate media="sc-gaFECw/V0_t$Time$.jpg?scale=160x90" timescale="90000" presentationTimeOffset="155390416120368"> <SegmentTimeline> <S t="155390416120368" d="518400" r="295"/> </SegmentTimeline> </SegmentTemplate> <Representation id="Thumb" bandwidth="10000" width="160" height="90"> <EssentialProperty schemeIdUri="http://dashif.org/thumbnail_tile" value="1x1"/> </Representation> </AdaptationSet> </Period> </MPD>

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 } } }

[dsilhavy]

@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

[sreinus]

@dsilhavy unfortunately the issue still persists with the nightly build.

[sreinus]

I found the issue. It seems that in TextSourceBuffer.js timestampOffset gives me a negative number. So I fixed it by adding an extra check in _getTimestampOffset() method. Now it looks like this:
function _getTimestampOffset() {
return !isNaN(instance.timestampOffset) && instance.timestampOffset > 0 ? instance.timestampOffset : 0;
}