What proxy transcoding defaults does Premiere Pro apply for low-traffic 4K editing?

Premiere Pro's proxy workflow is designed to transcode high-resolution media into optimized lower-bitrate files, reducing storage and CPU/IO demands during editing and export. For editors with occasional high-quality projects, this feature can improve workflow efficiency, but the documented behavior does not specify default transcoding parameters for low-traffic editing scenarios.

The precise goal is to identify the default proxy transcoding settings Premiere Pro applies when a user enables the feature for infrequently edited 4K projects, and whether those settings can be overridden per-project without re-linking original media or compromising quality metadata.

Key constraints include variable proxy behavior across Creative Cloud releases, lack of per-project default configuration documentation, and potential conflicts when original media is reconnected after proxy-based editing sessions.

• Which codec and bitrate does Premiere Pro select by default when generating proxies for 4K footage in a new project?
• Can project-specific proxy settings be saved and recalled without affecting the original media's clip properties?
• Do proxy files retain the original clip's timecode and metadata structure for seamless reintegration in subsequent editing sessions?