Low Latency Issue in Exo version 2.13.2

[GouravSna]

Issue:
In Playlist combination of Live and VOD content; low latency playback rate is not getting unset even though I am not setting it for VOD Asset.

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Please check my fork: https://github.com/GouravSna/ExoPlayer-1/tree/LowLatencyTest
Video for the issue: https://drive.google.com/file/d/1iulCk_tDtdnYRA64AdfUjdVJV9qENhaa/view?usp=sharing

Reproduction Steps:

1. I have kept one Live and one VOD asset in Playlist section named as "Live -> Vod"
2. I am doing LiveConfiguration for Live asset only and on the next VOD content, I am not touching the mediaItem Builder itself.

builder.setLiveTargetOffsetMs(5000)
          .setLiveMinOffsetMs(C.TIME_UNSET)
          .setLiveMaxOffsetMs(3000)
          .setLiveMinPlaybackSpeed(C.RATE_UNSET)
          .setLiveMaxPlaybackSpeed(10.0f);

3. Issue is if you see the max playback speed, i intentionally kept as 10.0f for Live asset. While live content is playing change the media in playlist.
4. Check the VOD content's playback speed is also high; it is not at normal speed.

Debug points:

1. Please filter the Log with Tag "LowLatencyCheck".
2. I have kept a handler of 1 sec to keep checking the player's currentLiveOffset for Live media.

Observation:
I have set the target live offset as 5000 ms so if suppose current Live Offset is starting near to 5000 ms then on change media; for VOD content you will not see this issue.
Try checking couple of time when the currentLiveOffset starts from far duration like 12000ms or 10000 ms then in that case, Live content will try to be fast to get closer to live edge. Now do the change media and you will see that for VOD asset, Playback rate is not normal.

My analysis here is that playback rate is somehow not getting reset internally. I checked the code of MediaItem class that in builder you are resetting the values for Live.

Kindly help me here.

Mediaitem state screenshot

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• ExoPlayer version number : 2.13.2
• Android version : 10.0
• Android device : Moto G6 (Widevine L1)

PS: One question, Can I rely on player.getPlaybackParameters().speed value to know the current playback rate ? Because I can see that speed is not updating for Low Latency; always I see 1.0f even I can see in that the playback is fast.

[marcbaechinger]

Thanks for reporting. I can repro that the internal playback speed is not reset when the user seeks to the next item after a live item. We will look into this.

Can I rely on player.getPlaybackParameters().speed value to know the current playback rate

The playback speed that is reported with player.getPlaybackParameters() is the public speed only. If the speed is temporarily changed for adjusting the speed due to reach the target live offset chosen with the live configuration, this is not reflected by the public playback parameters.

If you want to know the internal speed for logging or development purpose, you can wrap the DefaultLiveSpeedControl to be aware of the changes applied to the speed. See #8667 that explains this in more detail.

[GouravSna]

Hi @marcbaechinger , Can you please tell me the ETA of this fix ?