[Question] Playback is failing on certain DASH streams with TTMLs (taken from DashIF site) #4477
Comments
islor
changed the title
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Looks like the initialization chunk of the text track is malformed.
ISO 14496-12 says for the track_id in the trex box that "track_id identifies the track; this shall be the track ID of a track in the Movie Box". And for the trex box in general: "Quantity: Exactly one for each track in the Movie Box". |
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We'll post a workaround for the issue because it's quite easy to do. For the second stream above, there is actually yet another problem when switching the track selection from an embedded text track to a primary text track. That is a bug in our DashMediaPeriod. Will provide a fix for that too. |
Both boxes should contain the same list of track indices. However, if only one track index in each list does not match, we can just assume that these belong together. Issue:#4477 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=203481258
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The commit seems to have fixed the problem. Thanks! |
Until now, the streams were released and re-enabled for each type of stream (primary, event, embedded) in that order. That leads to problems when replacing streams from one type to another (for example embedded to primary). This change restructures the track selection to: 1. Release and reset all streams that need to be released or replaced. 1(a). Including embedded orphan streams. 2. Select new streams. Issue:#4477 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=203751233
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Closing because the second bug mentioned above (changing text tracks from embedded to primary) is also fixed now. |
Both boxes should contain the same list of track indices. However, if only one track index in each list does not match, we can just assume that these belong together. Issue:#4477 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=203481258
Until now, the streams were released and re-enabled for each type of stream (primary, event, embedded) in that order. That leads to problems when replacing streams from one type to another (for example embedded to primary). This change restructures the track selection to: 1. Release and reset all streams that need to be released or replaced. 1(a). Including embedded orphan streams. 2. Select new streams. Issue:#4477 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=203751233
Issue description
I've copied the some dash stream urls from the DashIF demo site and put them into the demo app. The stream plays well until I select one of the TTML tracks, then it shows "Playback failed"
What is the issue here? Log shows the inputstream is causing the problem, but why is it playing well in the demo site?
Link to test content
Tested these links:
http://vm2.dashif.org/livesim/testpic_2s/multi_subs.mpd
http://vm2.dashif.org/livesim/testpic_2s/cea608_and_segs.mpd
Version of ExoPlayer being used
2.8.1
Error log captured
logcat.txt
Let me know if you need more info! Thanks.
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