Primary edited sequence without effects, overlays, or graphics — clean dialog, action, reactions. B-roll and graphics layer on top. The structural backbone of the edit.
You're sitting at the editing bay with your timeline in front of you — the A-roll is what you start with. Not the graphics, not the archival footage, not the stock footage. The A-roll is the edited core sequence, the action, the interviews, the main camera takes in their final arrangement. It's the skeletal structure onto which all other flesh is added. Without a clean A-roll, you'll get lost in chaos.
In practice, this means: You first cut together the dialogue edits, lay the main shots onto the timeline, sync audio and video, and set your edit points. The A-roll is fully edited — fully, in this context, means all jump cuts have been decided, all transitions between scenes are in place, and there are no more placeholders in the sequencer. Only then do you contact the DI supervisor or the VFX supervisor: Where do we need transition material? Where do we insert B-roll? Where do the graphics go? The A-roll remains the reference track — everything is oriented around it.
The reason: A-roll is time-critical. If your interview runs for 45 seconds and the edit is locked, you need exactly 45 seconds of B-roll material to overlay — not 50, not 40. The A-roll dictates the length. That's why you edit it first, lock it down (or at least to a stable working version), and then build around it. Many beginners do it differently — they fiddle with the timeline, insert B-roll, and the A-roll constantly grows and shrinks. This leads to rework, botched transitions, and timing problems in the sound.
In longer formats — documentaries, TV reports — the A-roll structure is even more precise. You first edit the original soundbites (O-Töne), then the visual takes, then you insert editing music. This is your A-roll rough cut. After that comes the fine-tuning: color correction, keyframing, sound design. But the length, the sequence — that's set. This saves you an enormous amount of time later in the color grade and the final mix.
Think of the A-roll as your contract with the rest of post-production. It says: This is how long the project is, this is how fast it runs, here are the edit points, this is where external teams need to work. B-roll and graphics are the variables — A-roll is the constant.