When you want to follow a character without a break and keep the audience inside that space with them. The Wikipedia entry on long takes gives Martin Scorsese's Goodfellas 'Copacabana shot' as a leading example, and explains that Alfred Hitchcock tried to make Rope look like one long take.
Wikipedia gives the Copacabana shot in Goodfellas, where Henry takes his girlfriend through the kitchen into the nightclub, as the leading example of a long take.
To recreate it: Split the long path into 4 to 5 second clips, so that each clip passes through only one door or passage.
According to the CineFix video description, this shot was filmed by Steadicam operator Larry McConkey.
To recreate it: Write 'smooth stabilized camera following behind the couple' to create a movement that glides along right behind the people.
From 0:35 in the video, the camera follows right behind the two through the street, the back door, and the indoor passages in turn, taking the audience along.
To recreate it: Write the distance between character and camera in the same sentence for every clip, so the sense of distance doesn't jump when you join them.
According to Wikipedia, Hitchcock wanted Rope to look like a single shot, but a roll of film held at most 10 minutes. So at the end of a take he pushed in on a featureless surface such as a character's jacket and started the next take from the same point.
To recreate it: Generate the end of a clip as 'a dark back or wall filling the frame' and the start of the next clip as 'pulling back from that surface to reveal a new space', as a pair.
Around 0:45 in the video, a lamp with a red shade becomes an in-frame light source and tints the interior red.
To recreate it: Write lights that are visible in the frame, like 'red-shaded lamps glowing inside the club', so the light follows naturally even when the camera moves.
Cinematic multi-shot sequence, 15 seconds total, one continuous take with no visible cuts. Shot 1 (4s): smooth gimbal shot just behind a young waiter in a white jacket as he walks from a noisy back alley through a restaurant service door; Shot 2 (4s): gimbal follow through a steaming kitchen, ending as he passes behind a dark steel shelf that fills the frame; Shot 3 (4s): the frame emerges from behind the shelf into a glowing dining room with a live band, weaving between candlelit tables; Shot 4 (3s): the camera glides to a stop as he pulls out a chair for a smiling couple. Consistent waiter and restaurant, warm practical lights, 35mm film grain, matched color, energetic elegant mood.
Without cuts, the audience takes it as something happening right now rather than edited footage, and immersion deepens. The space changes each time you pass through a door or pillar, so it feels like one long journey.
The camera follows just behind the head of a young waiter in a white jacket as he walks from a noisy back alley through a restaurant's service door, his head staying in the same place in frame. Smooth stabilized gimbal move, warm practical lights, 35mm film grain, lively anticipation.
Continuing behind the waiter, the camera glides through a busy steaming kitchen as cooks shout and flames burst from pans, ending as he passes behind a tall dark steel shelf that fills the whole frame. Smooth gimbal follow, practical kitchen lights, 35mm grain, energetic chaos.
The frame emerges from behind a dark steel shelf into a glowing dining room with a live band, the waiter weaving between candlelit tables toward a couple waiting near the stage. Smooth forward gimbal move, warm candle and stage lights, 35mm film look, elegant excitement.
The camera glides in and settles as the waiter pulls out a chair for a smiling couple at a front table beside the stage, the band playing behind them. Smooth gimbal move slowing to a stop, medium shot, warm practical light, 35mm grain, satisfied arrival.
Between shots, cut at the frame where a dark shelf covers the most of the picture and join them with an invisible cut, overlapping 3 to 6 frames to cover it if needed. Keep the continuity of motion so every shot moves forward in the same direction and at the same speed. If the seam shows, hide it with a mask or wipe-by transition, compositing along the edge of the object that blocks the view.
If you generate a 20-second one-take in one go, the model fills the gaps between scenes with dissolves on its own, and people and objects tend to ooze into view. So the basic approach is to make several 4 to 5 second shots and join them with hidden cuts. Pair the end of each shot with "a dark object blocks the frame" and the start of the next shot with "emerging from behind that object, revealing a new space", and use the last frame of the previous shot as the start frame of the next. Color temperature and movement speed differ slightly from shot to shot, so erase the seams with shot-to-shot color matching and 5 to 15% speed adjustments.