Is your feature request related to a problem? Please describe.
I am currently working with diffusion models to upscale videos. The output from these models is of very high quality, often in a lossless format to preserve all the generated details. When compressing this footage to common distribution formats like 8-bit or 10-bit 4:2:0, a significant amount of color information and fine detail is lost. This effectively negates some of the benefits of the high-quality upscale.

Describe the solution you'd like
I would like to request the implementation of support for encoding into the following formats:

H.265 (HEVC) 12-bit 4:4:4

AV1 12-bit 4:4:4

Why this is important
This feature would be incredibly valuable for workflows involving AI-generated or upscaled content. These specific profiles offer the perfect balance:

**Quality Preservation**: They retain the full chroma information (4:4:4) and high bit depth (12-bit), which is crucial for preserving the subtle details and color fidelity produced by diffusion models.

**Efficient Compression**: They still provide a significant file size reduction compared to lossless intermediate codecs like ProRes or FFV1, making file storage and handling much more manageable.

Thank you in advance for your time and consideration.