Choose DCP settings for the intended screening, then confirm the cinema or festival’s delivery requirements before mastering. DCI defines interoperable system requirements, but compatibility depends on the complete path from mastering through delivery to playback.
What a DCP contains
A Digital Cinema Distribution Master (DCDM) is an interchange representation for image, audio, and subtitles. When that material is compressed, encrypted, and packaged for distribution, it becomes a Digital Cinema Package (DCP)—a theatrical delivery package, not simply a generic video export. DCI’s Digital Cinema System Specification, Version 1.4.2, approved for distribution June 15, 2022, describes the relevant system requirements. The DCI specification page identifies April 24, 2024 as the approval date for distribution of the linked version; check DCI and the receiving venue for any later requirements.
Which frame rate should you use?
DCI’s specified baseline DCDM image rate is 24.000 Hz. The specification also supports 48.000 Hz for 2K image content. Keep 24.000 fps distinct from 23.976 fps: the cited DCI requirement explicitly names 24.000 Hz, not 23.976.
2D presentation
For a conventional 2D DCP, select the frame rate that matches the intended presentation and the recipient’s supported workflow. A 2K image structure can be up to 48 fps; 4K is specified at 24 fps in the decoder summary. Do not assume that a particular cinema or festival will accept every technically described combination.
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Stereoscopic presentation
Stereoscopic 48 fps is a different use of 48 frames per second: left- and right-eye frames alternate, with each eye’s content captured for 24 fps presentation. Image and audio edits use a 24 fps edit rate and must preserve left/right cadence. This is not equivalent to a 2D film presented at 48 fps.
High-frame-rate compatibility
DCI’s HFR recommended practice is guidance, not a specification. It notes that installed equipment constrains interoperability and recommends testing the full creation and delivery pipeline before committing to a resolution and frame-rate combination. See the DCI HFR recommended practice, and confirm the proposed workflow with the recipient.
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How 2K and 4K relate to framing
DCI’s decoder summary describes 2K as up to 2048×1080 at 24 or 48 fps, and 4K as up to 4096×2160 at 24 fps. These are image-container structures; they do not mean every film fills every pixel in the rectangle. Resolution and the shape and placement of the active picture are separate decisions.
Set aspect ratio and active image framing according to the production and screening intent, then ensure the master and DCP represent them correctly. A 16:9 consumer-video export is not automatically the appropriate cinema master. Ask the post-production team and recipient to confirm the intended framing rather than inferring it from the 2K or 4K label.
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DCI’s hierarchical image structure is intended to support playback across resolutions: 2K media blocks can extract the 2K component from a 4K distribution, while 4K systems can display the full 4K DCDM. That system design does not replace checking the recipient’s actual delivery requirements.
What the audio labels mean
Conventional Sound Essence
DCI describes conventional Sound Essence as up to 16 channels of PCM audio carried as interleaved Broadcast Wave files in a Sound Track File. The audio remains uncompressed throughout the digital-cinema system. The specification requires playback support for 16 channels at 24-bit, 48 kHz and encourages capability at 96 kHz.
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Channel count alone does not tell you what each channel carries. Sound Essence channel labels and the playback device’s routing map audio to the intended auditorium loudspeakers or devices. Verify the channel labels, routing, sample rate, and bit depth with the post-production team and exhibition path.
Object-Based Audio Essence
DCI also defines Object-Based Audio Essence (OBAE), which combines PCM essence with descriptive temporal and spatial metadata and uses the immersive-audio track format. OBAE is not merely a conventional mix with extra fixed channels. Confirm that the recipient supports the intended OBAE workflow before choosing it.
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Make the delivery choices in this order
- Confirm presentation: Ask the cinema or festival whether the screening is 2D or stereoscopic and which frame-rate workflow it accepts. Treat DCI’s 24.000 Hz baseline and supported 2K 48.000 Hz structure as specification capabilities, not a guarantee about a particular venue.
- Choose image structure and framing: Select 2K or 4K based on the production master and recipient requirements. Specify aspect ratio and active image framing separately.
- Choose the audio approach: Establish whether the delivery uses conventional Sound Essence or supported OBAE. Confirm labels, routing, sample rate, and bit depth.
- Validate the whole path: Test creation, delivery, and playback—especially for an HFR combination—before committing to the final master.
DCI gives an explanatory maximum total image-distribution-stream rate of 250 Mbits/sec (Digital Cinema Initiatives, LLC, 2022). This is a technical limit described in the specification, not a typical DCP bitrate, a recommended export setting, or a statement about DCP file size.
There is no universal best setting
The right combination depends on recipient compatibility, frame rate, resolution, intended aspect ratio and framing, 2D versus stereoscopic presentation, and conventional versus object-based audio. Confirm those requirements with the receiving venue before mastering; technical support in a specification alone does not establish that every playback or delivery path will accept the combination.
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