Short answer
It depends on the selected variant and conversion method. Copying compatible streams can preserve quality, while transcoding or choosing a lower variant can reduce quality.
What to check
- Confirm that the stream is public or authorized for testing.
- Use the Checker to separate access problems from playlist structure.
- Do not treat a diagnostic result as permission to copy, bypass or redistribute media.
Next step
If the answer points to access, fix the origin policy or authorization first. If access works, continue with playback, segment and codec checks.