Seek Bar Behavior Breaks During Trickplay on Ad-Inserted DASH Stream

[ram-ji-yadav]

Have you read the [FAQ](https://bit.ly/ShakaFAQ) and checked for duplicate open issues?

Yes

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If the problem is related to FairPlay, have you read the [tutorial](https://shaka-project.github.io/shaka-player/docs/api/tutorial-fairplay.html)?

Yes

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What version of Shaka Player are you using?

Latest (also tested on demo player)

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Can you reproduce the issue with our latest release version?

Yes

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Can you reproduce the issue with the latest code from main?

Yes

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Are you using the demo app or your own custom app?

Own app, but the issue is also reproducible in the Shaka Player demo app

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What browser and OS are you using?

Chrome (latest), on desktop

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Manifest and License Server URIs

• Working (plain) stream:

  https://d22vhzp5gnxc1w.cloudfront.net/file_library/videos/vod_drm/4418456/1750764208_4231210377065075/test/1750764192846_698616781905771100_video_VOD.mpd
  

• Problematic (ads-inserted) stream:

  https://d2m03mcyloq6ym.cloudfront.net/v1/dash/d2b09582ecfb817c6e262d7de013ef6450de4f81/dae8a511-fc9b-4511-bed0-6f0af4b08e92/file_library/videos/vod_drm/4418456/1750764208_4231210377065075/test/1750764192846_698616781905771100_video_VOD.mpd
  

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What configuration are you using?

Default Shaka Player configuration

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What did you do?

• Loaded the second DASH manifest (with ad insertion and trickplay support).
• Tried to seek using the seek bar.
• Observed the behavior near the ad markers.

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What did you expect to happen?

• Trickplay to work properly even in the presence of ad markers.
• Seek bar to reflect the actual playable range correctly.
• No black screen at the end of playback.

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What actually happened?

• During trickplay near ad markers, the seek bar behaves unexpectedly.
• It increases incorrectly, and at the end of the video, playback halts and shows a black screen.
• This behavior is not observed in the plain (non-ad) stream.

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Are you planning to send a PR to fix it?

No

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[avelad]

You need to provide more information. How do you add ads? Are you using Shaka's AdManager?

[ram-ji-yadav]

Here are the additional information which might help in detecting the issue-
Ads are being stitched on server side using AWS MediaTailor.
MediaTailor URL is called from the player using a POST request with custom parameters
We use Shaka player's documentation related to AWS Elemental MediaTailor Integration
Dash manifest are multi period with segment length of 10 seconds

Please let me know if further info is required

[avelad]

Can you share the demo shaka player url that are you using? (while the stream is playing)

[ram-ji-yadav]

shaka player demo url : https://player.videocrypt.com/demo.html

[avelad]

shaka player demo url : https://player.videocrypt.com/demo.html

We need the url while you are playing your Ad asset in the Shaka Demo

[ram-ji-yadav]

Hi Avelad,

In this demo, the yellow markers on the seekbar indicate ad positions, with each ad having a duration of 30 seconds. These ads are server-generated. After 10:01 minutes, the video playback shows a black screen. Additionally, when hovering over the ad markers, the trickplay preview is still being displayed - this should not be happening. For your reference, I’ve attached two screenshots below.

Apologies for the confusion in the previously I mistakenly mentioned that the issue was reproducible in the Shaka Player demo app. However, we are currently using version 4.12.9 and not the demo setup.

please let me know if you need any additional information regarding our implementation.

[avelad]

I can see the markers now. I don't think it makes sense to show thumbnails when we hover over an ad. That would fix the problem. Do you think this is correct?