Why VHS tapes degrade
A VHS tape is a strip of plastic coated in magnetic particles, and the picture exists as the alignment of those particles. Everything that goes wrong follows from that being a physical arrangement rather than a recorded number.
What is actually failing
Magnetic particles gradually lose their alignment. The effect is slow, it happens whether or not the tape is ever played, and it shows as a picture that grows softer and noisier over decades. Nothing stops it. Cool, dry, dark storage slows it considerably.
The binder holding those particles to the plastic can absorb moisture and break down, which is the failure people call sticky shed. The tape squeals, sheds oxide onto the heads, and can jam. It is sometimes recoverable by careful baking before capture, and that is a job for someone who has done it before rather than an experiment on an irreplaceable tape.
Then there is mechanical wear. Every playback drags the tape across the heads. Tapes that were watched to death in the nineties have visibly worse pictures than tapes that sat in a box, and that damage is physical abrasion rather than signal loss.
The faults you see, and whether software helps
| Symptom | Cause | Fixable after capture? |
|---|---|---|
| Soft, low-detail picture | Format limit plus particle decay | Partly. Upscaling genuinely helps here. |
| Grainy speckle | Analogue noise floor | Yes, denoise handles it well. |
| Comb teeth on movement | Interlacing | Yes, and it must be done first. |
| Horizontal streaks and dropouts | Missing oxide, head clog | Barely. Fix at the deck. |
| Picture tearing at the top | Tracking misalignment | No. Re-capture with tracking adjusted. |
| Colour bleeding sideways | Very low chroma bandwidth | Partly, and never fully. |
| Rolling or flagging | Timebase instability | No. Needs a timebase corrector at capture. |
The pattern is worth internalising. Anything caused by the signal being noisy or low-resolution responds to restoration. Anything caused by the signal never being read correctly in the first place has to be fixed at the deck, and no amount of processing invents it back.
The capture matters more than the software
This is the part people skip, and it costs them. A tape captured on a clean, well-aligned deck with a timebase corrector produces a file that restoration can genuinely improve. The same tape captured on a jammed thrift-store VCR through a cheap USB dongle produces a file with damage baked in that no tool can remove.
If the tapes matter, it is worth finding a good deck or a transfer service, and worth capturing once at the highest quality you can rather than repeatedly. Every playback costs a little more of the tape.
Then the software order
Deinterlace, denoise, upscale, colour. Interlacing first is not a preference: an upscaler reads comb teeth as fine detail and sharpens them into something far harder to remove. Denoise before upscaling for the same reason, since magnified noise is a much bigger problem than the original.
Crisp runs that chain on-device, which for family tapes tends to matter more than it sounds. The usual alternative involves uploading footage of your family to a service, and these are the tapes people are least willing to hand over.
Tape damage, in detail
Are my tapes still playable after 30 years?
Usually yes, if they were stored somewhere cool and dry. Heat and humidity are what kill tapes, not age alone. The picture will be softer and noisier than it was, and that part responds well to restoration.
Should I digitise now or wait for better software?
Now. The tape is degrading whether or not you use it, and software improves far faster than tape survives. Capture at the best quality you can manage today and restore the digital file whenever you like.
Why does my capture look worse than the tape did on the old TV?
A CRT was hiding a lot. Its softness and the way it drew interlaced fields flattered analogue video, and a modern flat panel shows every fault sharply. The tape has not necessarily got worse; the display got more honest.
Can Crisp fix tracking lines and dropouts?
No. Those are places where the signal was never read correctly, so there is nothing in the file to recover. They have to be addressed at capture, with a properly aligned deck and ideally a timebase corrector.
Download Crisp for Mac Free to try, one-time $19 to remove the watermark. Runs entirely on your Mac.
See also: working through a family archive.