Your Footage Is the Production
Every other resource on a film set can be replaced. A broken light can be rented. A sick actor can be rescheduled. A costume that tears can be repaired. Footage that is lost or corrupted cannot be recovered. The data management workflow on your set is the single system where failure means catastrophic, irreversible loss.
This guide is for DITs, data wranglers, ACs on smaller productions where those roles overlap, and producers who need to understand what their data workflow actually requires.
The Roles: DIT vs. Data Wrangler
These titles get conflated, but the responsibilities are distinct.
A Digital Imaging Technician (DIT) is primarily a creative and technical collaborator for the Director of Photography. The DIT's job is quality control on the image: monitoring the signal, managing the color pipeline from camera to dailies, building and applying on-set LUTs, and ensuring that what the DP is creating is being captured and preserved correctly at the technical level.
A Data Wrangler (sometimes called a Loader or a Data Manager on smaller productions) is primarily responsible for offloading, verifying, and backing up camera cards. On larger productions, these are separate people with separate stations. On smaller ones, a single person does both.
Understanding the distinction matters because the DIT's relationship is primarily with the DP; the data wrangler's relationship is primarily with the camera department and post-production. When one person is doing both jobs, those relationships and those priorities need to be managed explicitly.
The 3-2-1 Rule: Non-Negotiable
Three copies. Two different media types. One off-location.
This is not a suggestion. This is the minimum standard for any professional production. On a feature shoot:
- Primary — RAID array or fast SSD at the data management station on set
- Secondary — A second drive that matches the primary, ideally formatted differently (one HFS+, one exFAT, for example) to guard against format-specific corruption
- Off-site — A third copy that leaves the set location each night. This copy protects against fire, theft, or catastrophic damage to the set.
Some productions add a fourth copy for cloud backup, particularly for documentary and commercial work where the footage is being reviewed by remote stakeholders simultaneously. Aspera and Signiant are the standard high-speed transfer platforms for cloud-based dailies delivery.
The Offload Process: Step by Step
1. Never offload directly from the camera body. Pull the card, bring it to the data station. Cameras running while cards are being read creates potential for record errors. It also keeps the camera department from knowing which cards are clear to format.
2. Use verified offload software. The industry standard tools are YoYotta, Silverstack, and DaVinci Resolve's built-in clone tools. These tools perform a frame-accurate checksum comparison between the source card and the destination drive. If the checksum doesn't match, the offload failed. Do not skip this step. An offload without checksum verification is not an offload — it's a copy with unknown integrity.
3. Maintain the source card until verification passes. The camera card is not cleared for formatting until your primary backup has been verified. This sounds obvious, but on fast-moving shoots with limited cards, there is enormous pressure to format cards quickly. Resist it. One unverified formatting event is all it takes.
4. Log every card offloaded. Card number, camera, reel, start and end timecodes, file count, total file size, checksum result, offload time, and operator. This log is your production's chain of custody for every frame of footage. It matters if anything goes wrong in post.
5. Label drives physically. Not just by digital folder name. Physical labels on drives with production name, date, and copy designation (primary, secondary, off-site). In the chaos of a late wrap, unlabeled drives are a liability.
Camera Cards: Handling and Formatting
Handle cards like the raw stock that they are. Static damage, physical damage, and improper insertion/removal are the three most common sources of card failure. Anti-static bags for storage, careful handling, and always ejecting via the operating system (never pulling a card mid-read) are the basics.
Formatting should always be done in-camera. OS-level formatting of camera cards removes metadata the camera system needs and can introduce compatibility issues. Format in the camera body, not on a computer.
Keep a physical log of camera cards. Which cards came with which camera body, when they were issued, when they were returned, and when they were formatted. Camera originals (cards that haven't been formatted and contain master footage) should be identified and segregated in any workflow where there's a question about post-production delivery.
The Color Pipeline: On-Set LUTs and Dailies
The DIT's most creatively significant responsibility is managing the on-set color pipeline — specifically, the LUTs (Look Up Tables) that translate the camera's flat log signal into a monitor-viewable image.
Show LUT vs. Camera LUT — The camera LUT converts log to a standardized color space (typically Rec.709 or P3). The show LUT applies the creative look developed by the DP. These are different things. Applying the show LUT without the camera LUT underneath it produces incorrect results. Understanding the color pipeline order matters.
CDL values — Color Decision Lists are a standardized format for recording per-shot color adjustments made on set. CDL values (slope, offset, power, and saturation) can be communicated to post-production and applied to the conform, maintaining any on-set color work in the final grade. If you're not recording CDL values, you're making color work that evaporates when the production ends.
DIT cart setup — A professional DIT cart includes a calibrated reference monitor, a color management workstation running something like Pomfort Livegrade or Blackmagic Design's DaVinci Resolve Micro Panel, a signal distribution path from camera output, and a robust power supply. Entry-level DIT setups can be built for under $5,000; high-end narrative feature DIT carts run significantly more.
Handoff to Post-Production
The end of the data management workflow is the beginning of the post-production workflow. The handoff needs to include:
- Drive manifest — A complete, file-level manifest of every folder and file on every drive, with checksums. The post facility uses this to verify that what they received matches what was shipped.
- Color pipeline documentation — What camera system was used, what recording format, what color space, which LUTs were applied for monitoring, CDL values per scene.
- Sound report correlation — Camera reports and sound reports need to be matched before handoff so that the conform process can correctly sync audio to picture. Missing or mismatched reports are a common source of post-production delays.
- Drive condition log — Any cards that showed read errors, any drives that had offload failures, any footage that required re-offload. Post needs to know what was clean and what had issues.
The Minimum Viable Data Setup
For independent productions without a dedicated DIT:
- Two drives minimum — One primary SSD, one backup spinning drive. Different manufacturers when possible.
- YoYotta or Silverstack for verified offload — Both have tiered pricing accessible for independent use.
- Physical card log — A printed spreadsheet per shoot day, filled out by hand. Low-tech but reliable.
- Off-site rule — One drive leaves the location every night. Keeps it in a case in the producer's car, not in the camera room.
The complexity scales with the production. The principles don't.