Dolby Vision Profile 9
Dolby Vision Profile 9 uses a single eight-bit AVC picture layer with an SDR-compatible base and Dolby Vision metadata.
Profile 9 pairs an eight-bit AVC/H.264 picture with Dolby Vision metadata and an SDR-compatible base. It is a specific delivery arrangement, with these properties:
| Property | Profile 9 |
|---|---|
| Compression | AVC/H.264 High-profile family |
| Coded base precision | Eight bits |
| Dolby Vision picture enhancement | None |
| Base compatibility | SDR |
Why can playback legitimately appear as SDR?
A suitable ordinary AVC/SDR route can decode and interpret the compatible base. It is using an intended available picture rather than necessarily converting the entire presentation on the server.
A Dolby Vision route additionally needs Profile 9's metadata and signal processing. The successful AVC decode is the starting picture-reconstruction job, not a record of whether those later operations occurred.
What does the eight-bit field describe?
It identifies the coded base precision. That says how the compressed picture represents its samples, while the profile's processing establishes how those samples and metadata become the output presentation. Another source release can differ in its grade or retained precision, even if both are eventually shown with a Dolby Vision output mode.
For Emby, compare the source profile, actual delivered stream, and app/output path. A source and an SDR display can be connected by compatible-base use or by a real conversion; the delivery evidence distinguishes them. The profile number identifies this arrangement rather than a quality tier above Profile 8.