Hello Samsung / Tizen Technical Support Team,
We are observing a playback issue on Samsung Tizen TVs when streaming DRM-protected content that uses a multi-key DRM configuration. We would like to report the issue and request assistance in investigating the behavior on Samsung devices.
DRM Provider: Castlabs
DRM Type: Widevine
Streaming Format: MPEG-DASH (MPD)
Player Environment: Samsung Tizen Application using the Samsung AVPlay / native playback stack.
Content DRM Configuration:
Our content is packaged with a multi-key DRM setup, where different resolution groups use different encryption keys:
Key 1: 360p, 480p, 720p
Key 2: 1080p, 4K
Observed Issue:
Playback starts normally and the video plays correctly at the initial resolution. However, when the adaptive bitrate algorithm triggers a resolution change that requires switching DRM keys, playback fails.
Specifically, the issue occurs in the following scenarios:
When switching from 720p → 1080p or higher
When switching from 1080p → 720p or lower
In both cases, the switch requires a DRM key change, and the playback fails shortly after the transition.
Additional Observations:
If we modify the MPD to limit playback to only one key group (for example, only up to 720p or only 1080p and above), playback works correctly without any interruption.
The issue appears only when the player needs to switch between representations encrypted with different keys.
Playback works correctly on other platforms using the same MPD and DRM configuration.
The issue appears specific to Samsung Tizen playback behavior during multi-key DRM key transitions.
Device Details (Example Device Where Issue Was Observed):
Model Code: UA32T4380AKXXL
Software Version: T-KTS2UABC-2700.6
Platform: Samsung Tizen TV
Error Behavior:
Video plays normally for some time and then fails after a resolution change requiring key switch.
In some cases playback stops after ~20–30 seconds when adaptive bitrate switching occurs.
Request:
Could you please confirm:
Whether multi-key DRM streams with adaptive bitrate switching across keys are fully supported on Samsung Tizen TVs.
If there are specific packaging or DRM license configuration requirements for multi-key playback.
Whether there are known limitations in AVPlay or Tizen DRM handling related to key switching during DASH adaptive playback.
We would appreciate any guidance or debugging steps that could help identify the root cause of this issue.
Device Details:
Test Labs Device:
Korea (Suwon-TV), NEO QLED 4K, QN55QN80F(2025), Tizen 9.0, QN55QN80FAFXZA
Actual TV:
UA32T4380AKXXL (Model Number)
