I think I found that the CED disc store video in FM and the sound in AM.
But now i found that both is FM.
What is right? Or is there another medium where video is FM and sound AM or vice versa?
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in aerial broadcast video is AM (to be precise VSB-SC modulation) and sound is FM - FM is beneficial in situations where your medium is highly nonlinear - to detect FM you need only frequency (and frequency can be expressed in binary form) - AM need linear medium with characteristic flat as much possible over spectrum.
Archaic CED discs had both composite video and audio modulating the carrier using FM.