EDL (Edit Decision List): Meaning in Film Production

EDL (Edit Decision List)

Definition

An EDL, or edit decision list, is a plain text file that describes an edit as a list of events. Each event names the source clip or reel, the source timecode in and out, and where it lands on the record timeline. Colorists and online editors use EDLs to rebuild a cut from the original camera files.

Reading an EDL line

A CMX 3600 EDL looks like this when you open it in a text editor:

TITLE: LONG_DRIVE_R3_LOCK_V2
FCM: NON-DROP FRAME

001  A042C003 V     C        14:22:10:05 14:22:13:17 01:00:00:00 01:00:03:12
* FROM CLIP NAME: A042C003_260612_R1AB.MXF

002  B017C011 V     C        09:41:02:20 09:41:05:02 01:00:03:12 01:00:05:18
* FROM CLIP NAME: B017C011_260612_R2CD.MXF

003  A042C004 V     D    012 14:25:30:00 14:25:34:10 01:00:05:18 01:00:10:04

Event 001 takes 3 seconds and 12 frames of A camera, clip 3 on card 42, starting at source timecode 14:22:10:05, and places it at the start of reel 3 on the record side. The C means a straight cut. Event 003 has a D and 012, a 12-frame dissolve into the next clip. The source and record durations match in every event unless a speed change is involved, which is one of the first things an assistant editor checks.

How it gets used in finishing

Editors cut with lightweight proxy files. At picture lock, the assistant exports an EDL (often one per reel, since shorter lists are easier to troubleshoot) and hands it to the online editor or colorist. The colorist loads the EDL against the original camera files and the conform rebuilds the cut at full resolution. Because the EDL matches on reel name and timecode, those two pieces of metadata have to survive from camera card to edit to finish without being changed.

VFX vendors get EDLs too, with handles added. A VFX pull might request eight frames of handle on either side of each shot, so the vendor has room if the editor extends a cut by a few frames.

What breaks EDLs

Most failures come from metadata. If the DIT or a transcode renames clips, the reel names in the EDL won't match the camera originals. If two cameras recorded with the same timecode and card numbers, the conform can pull the wrong clip. Speed ramps, nested sequences, and multiple video tracks don't translate well into CMX 3600, so editors flatten or flag them before export.

The fix starts on set: unique card and reel names per camera per day, consistent timecode, and a camera report that matches the files. A mismatched EDL usually surfaces as a flash frame or a wrong shot flagged in the QC report, which is far more expensive to trace than a clean naming convention at dailies.

Frequently asked questions

What is the difference between an EDL, XML, and AAF?

An EDL is a simple list of cuts and basic transitions, usually on one video track. XML and AAF carry much more, including multiple tracks, effects, speed changes, and audio. Many finishing workflows send an XML or AAF and a matching EDL as a cross-check.

Why do EDLs still exist?

They are readable by almost every editing, color, and VFX system, and a person can open one in a text editor to check a single event. When a turnover breaks, the EDL is often how the assistant editor finds the problem.

What does CMX 3600 mean?

It is the EDL format that came from CMX Systems' editing controllers and became the common standard. It limits clip names and assumes one video track per list, which is why long clip names get truncated.