Tape dropout
Also called: video dropout, dropouts, white flecks, dropout lines
Tape dropout is the white or black flecks on worn videotape where the signal briefly vanishes. See the cause and how to recreate it with TERMINAL FADE.
WHAT CAUSES IT
Tape dropout is a short loss of the recorded signal, caused by anything that stops the head from reading the magnetic layer for a few microseconds. Oxide that has shed from the tape, dust trapped between the head and the tape, a tiny scratch, or a patch where the binder has degraded all interrupt the FM carrier. The demodulator then outputs an extreme level instead of the true picture, and on the screen this becomes a short horizontal streak, usually white and sometimes black. Many decks include a dropout compensator that detects the loss of carrier and substitutes the previous line from a one-line delay. The substitution works for ordinary pictures because neighboring lines are similar, and in NTSC it also handles chroma phase as needed. Heavy damage, long dropouts, or a bad compensator leave visible repeats and streaks. Because each dropout is a short event in line time, it appears as a horizontal fleck or a few lines of repeated picture, not as a block.
WHAT IT LOOKS LIKE
Short horizontal white or colored dashes, a few pixels to a quarter of the frame wide, scattered across the picture and different each frame. Some are a single line high; others stack for several lines. Where a compensator filled the gap, you see copies of the line above, which creates a small smeared stripe of repeated content rather than a bright fleck. Colors in the dropout can flip to the wrong hue for a moment. In very worn tapes, the flecks cluster in time as the tape passes a damaged stretch, and the picture seems to sparkle.
WHERE YOU SEE IT
Old rental VHS, home-recorded tapes that have shed oxide, U-matic and Betacam archives, and any footage digitized from tape that has sat for decades. It is common in documentaries made from archive tape, and in found-footage horror where the tape itself needs to feel old. Dropout is the standard visual signature of physical media decay, distinct from the noise of a weak broadcast signal.
RECREATE IT
TERMINAL FADE
CONTROLS DROPOUT, DOC REPEAT, GENERATIONS
DROPOUT sets how many flecks appear, and DOC REPEAT governs the line-repeat behavior of a dropout compensator that cannot keep up. Start with DROPOUT low so each fleck stays readable as a single event, then raise DOC REPEAT to add repeated line stripes. Avoid a high density across the whole shot; real dropouts cluster at damaged stretches, so keyframe them in bursts.
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HOW TO MAKE IT IN AFTER EFFECTS
1. Pre-compose the shot so the dropouts sit on the final image. 2. Apply TERMINAL FADE to the pre-comp. 3. Set DROPOUT to a low value and scrub through a few seconds to check the density; you want a few flecks per frame at most. 4. Raise DOC REPEAT if you want the compensator-fill look, where lines repeat instead of flashing white. 5. Add a small amount of GENERATIONS to give the surrounding picture the softness of a copied tape. 6. Keyframe DROPOUT so it rises in a burst for half a second and then falls, since real damage passes in a stretch. 7. If you need a particular fleck to land on a particular frame, cut the layer there and apply the burst to just that section. 8. Render a few seconds and watch at playback speed, because flecks that look fine on a still often feel too busy in motion.
QUESTIONS
- What causes dropouts on VHS tapes?
- Shed oxide, dust, tape wear, and scratches stop the head from reading the magnetic layer for a moment. The demodulator outputs an extreme level during the gap, producing a white or black streak. Storage in heat or humidity speeds up binder breakdown.
- What does a dropout compensator do?
- It detects loss of the FM carrier and replaces the missing line with the previous line from a delay. This hides most dropouts. When damage is heavy, it shows up as repeated lines instead of bright flecks. A healthy compensator makes most damage invisible, so a tape that still shows many streaks has either lost long stretches or has a failing compensator.
- Is dropout the same as tracking error?
- No. Dropout is a brief local loss of signal in the tape or head contact, while tracking error is the head being off the recorded track, which produces a tall band of noise. They often appear on the same worn tape, which is why people mix them up, but dropouts are short flecks, while tracking error forms a broad band.
- Can you remove dropouts digitally?
- Temporal cleanup can detect and replace short flecks using neighboring frames, and it works well on stationary footage. It is harder when the dropout is on a fast moving subject. Cleaning the tape and trying another deck before capture helps most.