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Filmmaking Dictionary: Letter Q / QuickTime Reference File
Definition
A QuickTime reference file is a movie file that refers to media stored outside the file instead of containing all the picture and sound data itself. It can describe an edited sequence while relying on source or rendered media elsewhere on the system.
This is a specific file structure used in some QuickTime workflows, especially older editing and encoding systems. It is not simply any movie sent to someone “for reference,” and it is not the same thing as a low-resolution review copy.
Why Reference Movies Were Useful
A reference export can be small and quick to create because it avoids writing a complete new copy of all the underlying media. In a compatible workflow, another application can read the reference and access the original material for encoding or processing.
The benefit depends on those applications understanding the reference file and being able to reach the media. The file is not independently portable just because it has a familiar .mov extension.
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Reference, Self-Contained and Proxy Files
- Reference movie: depends on externally stored media for some or all of its content.
- Self-contained movie: holds the media needed for its own playback within the movie file, subject to codec and player compatibility.
- Proxy: an alternate representation used to make editing easier; it may be a normal self-contained media file.
- Review or reference export: describes a purpose, such as checking an edit, rather than guaranteeing a particular file structure.
A .mov file is a container, not a codec name. Two .mov files can have different media types, compression and dependency arrangements.
Why a Reference File Stops Working
Moving or deleting referenced media can break playback. A recipient may also lack access to the original drive, network location, required codec or compatible application. A reference that works on the editor’s machine can fail on a separate workstation.
For example, an assistant sends a very small reference movie from an older project to a collaborator. It plays correctly at the editing station but shows missing media elsewhere because the collaborator received only the reference file. Renaming the extension does not add the absent picture or sound.
Working With Legacy Projects
Treat reference movies as part of a dependency chain. Preserve the associated source and render media, directory structure where needed, and information about the originating software. Check application support before building a handoff around this format.
Modern applications and operating systems do not all support older QuickTime components or reference workflows. Do not assume an export option mentioned in an old manual is still available in the current version.
For a normal review or delivery, make the self-contained export required by the recipient and check that actual file. For an archive, retain the project and required source material as well; a viewing export alone may not preserve the editable project.
See delivery and quality control for the final handover checks.
Related Terms
- Post Production
- Assistant Editor (Post-Production)
- Delivery
- Quality Control (QC) in Post-Production
- Compression
Browse terms beginning with Q or return to the filmmaking dictionary.