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Different role flags combined in one TrackGroup #2148

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Different role flags combined in one TrackGroup#2148
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tonihei
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@git1904
git1904
opened on Feb 15, 2025

Hello
I have this Question to make for some time now about this error playing an MPD

``

java.lang.IllegalStateException: Different role flags combined in one TrackGroup: '0' (track 0) and '100000000000010' (track 1)
at androidx.media3.common.TrackGroup.logErrorMessage(TrackGroup.java:233)
at androidx.media3.common.TrackGroup.verifyCorrectness(TrackGroup.java:208)
at androidx.media3.common.TrackGroup.(TrackGroup.java:96)
at androidx.media3.exoplayer.dash.DashMediaPeriod.buildPrimaryAndEmbeddedTrackGroupInfos(DashMediaPeriod.java:708)
at androidx.media3.exoplayer.dash.DashMediaPeriod.buildTrackGroups(DashMediaPeriod.java:529)
at androidx.media3.exoplayer.dash.DashMediaPeriod.(DashMediaPeriod.java:160)
at androidx.media3.exoplayer.dash.DashMediaSource.createPeriod(DashMediaSource.java:580)
at androidx.media3.exoplayer.source.MaskingMediaPeriod.createPeriod(MaskingMediaPeriod.java:131)
at androidx.media3.exoplayer.source.MaskingMediaSource.onChildSourceInfoRefreshed(MaskingMediaSource.java:214)
at androidx.media3.exoplayer.source.WrappingMediaSource.onChildSourceInfoRefreshed(WrappingMediaSource.java:154)
at androidx.media3.exoplayer.source.WrappingMediaSource.onChildSourceInfoRefreshed(WrappingMediaSource.java:49)
at androidx.media3.exoplayer.source.CompositeMediaSource.lambda$prepareChildSource$0$androidx-media3-exoplayer-source-CompositeMediaSource(CompositeMediaSource.java:117)
at androidx.media3.exoplayer.source.CompositeMediaSource$$ExternalSyntheticLambda0.onSourceInfoRefreshed(D8$$SyntheticClass:0)
at androidx.media3.exoplayer.source.BaseMediaSource.refreshSourceInfo(BaseMediaSource.java:90)
at androidx.media3.exoplayer.dash.DashMediaSource.processManifest(DashMediaSource.java:937)
at androidx.media3.exoplayer.dash.DashMediaSource.onUtcTimestampResolved(DashMediaSource.java:864)
at androidx.media3.exoplayer.dash.DashMediaSource.access$500(DashMediaSource.java:99)
at androidx.media3.exoplayer.dash.DashMediaSource$1.onInitialized(DashMediaSource.java:852)
at androidx.media3.exoplayer.util.SntpClient$NtpTimeCallback.onLoadCompleted(SntpClient.java:325)
at androidx.media3.exoplayer.upstream.Loader$LoadTask.handleMessage(Loader.java:487)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.os.HandlerThread.run(HandlerThread.java:67)

The MPD xml have the following AdaptationSets, Representations and Roles ( removed some xml to make it better readable it contains DRM )

<MPD xmlns="urn:mpeg:dash:schema:mpd:2011"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:cenc="urn:mpeg:cenc:2013"
    xmlns:mspr="urn:microsoft:playready"
    profiles="urn:mpeg:dash:profile:isoff-live:2011"
    type="dynamic"
    availabilityStartTime="1970-01-01T00:00:00Z"
    publishTime="2025-02-15T01:56:56Z"
    timeShiftBufferDepth="PT20S"
    minimumUpdatePeriod="PT2S"
    maxSegmentDuration="PT2.006S"
    minBufferTime="PT6S">
    <Period id="1" start="PT0S">
        <AdaptationSet id="1" group="1" bitstreamSwitching="true" segmentAlignment="true" contentType="video" mimeType="video/mp4" maxWidth="1280" maxHeight="720" par="16:9" maxFrameRate="50" startWithSAP="1">
            <SegmentTemplate timescale="10000000" media="S!d2EPREFTSF9BVkNfRlVMTEhEEgJU.v...wEWBJ8_/QualityLevels($Bandwidth$)/Fragments(video=$Time$)">
                <SegmentTimeline>
                    <S t="17395845890304560" d="20000000" r="9"/>
                </SegmentTimeline>
            </SegmentTemplate>
            <Representation id="dzEUrgef" bandwidth="503316" codecs="avc1.4d4029" width="384" height="216" frameRate="25" sar="1:1"/>
            <Representation id="dzF6FA6f" bandwidth="922746" codecs="avc1.4d4029" width="640" height="360" frameRate="25" sar="1:1"/>
            <Representation id="dzHhehif" bandwidth="1604321" codecs="avc1.4d4029" width="704" height="396" frameRate="25" sar="1:1"/>
            <Representation id="dzEAADCf" bandwidth="3145728" codecs="avc1.640029" width="1280" height="720" frameRate="50" sar="1:1"/>
        </AdaptationSet>
        <AdaptationSet id="2" group="32" bitstreamSwitching="true" segmentAlignment="true" contentType="video" mimeType="video/mp4" maxWidth="1280" maxHeight="720" par="16:9" maxFrameRate="50" startWithSAP="1" codingDependency="false">
            <EssentialProperty schemeIdUri="http://dashif.org/guidelines/trickmode" value="1"/>
            <Role schemeIdUri="urn:mpeg:dash:role:2011" value="alternate"/>
            <SegmentTemplate timescale="10000000" media="S!d2EPREFTSF9BVkNfRlVMTEhEEgJU.v...wEWBJ8_/QualityLevels($Bandwidth$)/Fragments(trickmode=$Time$)">
                <SegmentTimeline>
                    <S t="17395845890304560" d="20000000" r="9"/>
                </SegmentTimeline>
            </SegmentTemplate>
            <Representation id="trickmodedzEUrgef" bandwidth="503316" codecs="avc1.4d4029" width="384" height="216" frameRate="1" sar="1:1" maxPlayoutRate="25"/>
            <Representation id="trickmodedzF6FA6f" bandwidth="922746" codecs="avc1.4d4029" width="640" height="360" frameRate="1" sar="1:1" maxPlayoutRate="25"/>
            <Representation id="trickmodedzHhehif" bandwidth="1604321" codecs="avc1.4d4029" width="704" height="396" frameRate="1" sar="1:1" maxPlayoutRate="25"/>
            <Representation id="trickmodedzEAADCf" bandwidth="3145728" codecs="avc1.640029" width="1280" height="720" frameRate="1" sar="1:1" maxPlayoutRate="50"/>
        </AdaptationSet>
        <AdaptationSet id="3" group="2" bitstreamSwitching="true" segmentAlignment="true" contentType="audio" mimeType="audio/mp4" lang="por">
            <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
            <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main"/>
            <SegmentTemplate timescale="48000" media="S!d2EPREFTSF9BVkNfRlVMTEhEEgJU.v...wEWBJ8_/QualityLevels($Bandwidth$)/Fragments(audio_482_por=$Time$)">
                <SegmentTimeline>
                    <S t="83500060274012" d="96256"/>
                    <S d="95232"/>
                    <S d="96256" r="2"/>
                    <S d="95232"/>
                    <S d="96256" r="2"/>
                    <S d="95232"/>
                </SegmentTimeline>
            </SegmentTemplate>
            <Representation id="dyHiAZ8." bandwidth="96000" codecs="mp4a.40.2" audioSamplingRate="48000"/>
        </AdaptationSet>
        <AdaptationSet id="4" group="2" bitstreamSwitching="true" segmentAlignment="true" contentType="audio" mimeType="audio/mp4" lang="AUD">
            <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
            <Role schemeIdUri="urn:mpeg:dash:role:2011" value="alternate"/>
            <SegmentTemplate timescale="48000" media="S!d2EPREFTSF9BVkNfRlVMTEhEEgJU.v...wEWBJ8_/QualityLevels($Bandwidth$)/Fragments(audio_483_AUD=$Time$)">
                <SegmentTimeline>
                    <S t="83500060274012" d="96256"/>
                    <S d="95232"/>
                    <S d="96256" r="2"/>
                    <S d="95232"/>
                    <S d="96256" r="2"/>
                    <S d="95232"/>
                </SegmentTimeline>
            </SegmentTemplate>
            <Representation id="dyHjAZ8." bandwidth="96000" codecs="mp4a.40.2" audioSamplingRate="48000"/>
        </AdaptationSet>
        <AdaptationSet id="5" group="8" bitstreamSwitching="true" segmentAlignment="true" contentType="text" mimeType="application/mp4" lang="887">
            <Role schemeIdUri="urn:mpeg:dash:role:2011" value="alternate"/>
            <SegmentTemplate timescale="10000000" media="S!d2EPREFTSF9BVkNfRlVMTEhEEgJU.v...wEWBJ8_/QualityLevels($Bandwidth$)/Fragments(887_0=$Time$)">
                <SegmentTimeline>
                    <S t="17395845890304560" d="20000000" r="9"/>
                </SegmentTimeline>
            </SegmentTemplate>
            <Representation id="dxFknw.." bandwidth="100" codecs="stpp"/>
        </AdaptationSet>
        <AdaptationSet id="6" group="8" bitstreamSwitching="true" segmentAlignment="true" contentType="text" mimeType="application/mp4" lang="885">
            <Role schemeIdUri="urn:mpeg:dash:role:2011" value="alternate"/>
            <SegmentTemplate timescale="10000000" media="S!d2EPREFTSF9BVkNfRlVMTEhEEgJU.v...wEWBJ8_/QualityLevels($Bandwidth$)/Fragments(885_1=$Time$)">
                <SegmentTimeline>
                    <S t="17395845890304560" d="20000000" r="9"/>
                </SegmentTimeline>
            </SegmentTemplate>
            <Representation id="dxFlnw.." bandwidth="101" codecs="stpp"/>
        </AdaptationSet>
    </Period>
</MPD>

I don't understand exactly what the error means and if this can be "ignored"
I did search before come here and didnt find anything related to this, i saw that the expection is not throwing error it just print the error but the video is not playing.
I know that editing the mpd on-fly works by creating a custom datasource to remove the <Role tags... but is that the only way? :(

Activity

  1. git1904
    added
    needs triage
    question
    on Feb 15, 2025

  2. tonihei commented on Feb 21, 2025

    @tonihei
    tonihei
    on Feb 21, 2025
    Collaborator

    This error is only logged to logcat and should not prevent playback. Can you confirm this doesn't prevent playback?

    Otherwise, the error is telling you that the AdaptationSets with id 1 and 2 are marked as the same content (by the trickmode EssentialProperty linking to the set with id=1), but they have different roles defined (the representations in the set with id=1 have no role, but the ones in the set with id=2 have the role "alternate"). This may cause issues during track selection because a single group that is meant to represent the same content no longer has a clear role definition.

  3. tonihei
    self-assigned this
    on Feb 21, 2025
  4. tonihei
    removed
    needs triage
    on Feb 21, 2025
  5. copybara-service
    added a commit that references this issue on Jun 30, 2025

    Ensure trick play tracks are not merged with incompatible main group

    7c000e6

  6. tonihei commented on Jun 30, 2025

    @tonihei
    tonihei
    on Jun 30, 2025
    Collaborator

    Submitted a change that avoids putting these two tracks in the same TrackGroup

  7. tonihei
    closed this as completedon Jun 30, 2025
  8. shahdDaghash
    added a commit that references this issue on Jul 7, 2025

    Ensure trick play tracks are not merged with incompatible main group

    3011f7d
  9. androidx
    locked and limited conversation to collaborators on Aug 29, 2025
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