Pick a programme with an obvious change
Use a scene where detail is easy to see. Write down when the picture softens and whether audio continues. If your app exposes input format or current rendition, read that field at the same time. Then check the TV’s input information. A stable display setting alongside a changing input rendition points to a different issue from a display losing its HDMI signal.
Compare the controls
An HLS master playlist can describe several variants. The player may choose a different variant as its estimate of conditions changes. Its decision can also depend on device support. Keep the app and station fixed and change one network variable, or use one lower-format control item before switching to another device. Avoid equating a change in source rendition with a permanent loss of account features.
| What you observe | Useful second observation |
|---|---|
| Picture softens while audio continues | Check the player’s current source rendition if shown. |
| TV flashes a format notice and briefly goes black | Check the display mode change and HDMI route. |
| One programme always looks soft on two compatible players | Ask about that specific source and available variants. |
| Several channels switch quality at the same busy time | Compare the receiver's network conditions against a quieter control. |
Record the time, device and two observations. This makes it easier to distinguish adaptive playback from a fixed low-resolution feed or a display format change.