Recording audio and video have different bandwidth requirements.
Analog Video Recording Standards and Formats
Audio versus Video Recording
The recording process is essentially the same for both audio and video recording, but about 200 times more information can be found in the video signal than in an audio signal.You can fit only so much information onto a given piece of tape. As a result, there's simply not enough room for all the video information using audio recording technology.
The biggest difference is that audio heads are stationary. Video uses several smaller heads mounted on a rotating disc. This allows more information to be put down in the same space.
Helical Video Recording
Helical tape machines are the standard of the broadcast industry. ...
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