Ah. You should say “composite” then, not “av”.
I’ve never seen any DVI-to-composite cables, though. Or were you referring to Component? Either way the below still stands.
Your problem is still the same as Darksakul outlined:
Console output = HDMI (digital)
Since your end result is composite (analog), you’ll NEED to do a conversion somewhere.
The DVI connector is a multi use connector. Depending on the device like some video cards the DVI connector does Digital and Analog. The DVI cable has to be formatted as a Dual Format cable to transmit Digital or Analog (it never does both).
A HDMI to DVI cable is only Digital Only and may or may not lack Audio (zero sound).
The DVI end of a HDMI to DVI cable is DVI-D.
DVI comes in the following formats:
DVI-I (Integrated) both Analog and Digital
DVI-D Digital Only (both single and dual link)
DVI-A (Analog Only)
Analog on the DVI cable comes only as VGA formats.
VGA is Analog with the video feed separated into Red, Blue, Green, Vertical Sync and Horizontal Sync.
Video Composite all of those signals are combined on a single wire.
Composite Video is denoted by a Yellow RCA Jack.
Video Composite is not apart of the DVI spec at all.
That’s a misnomer, Audio isn’t actually apart of the format. Composite is video Only, the Audio yes is carried by the same style RCA plugs is its own raw analog format thats been around since the early days of electronics.
No actual encoding takes place on that Analog Audio.
I am telling you now, having a HDMI to DVI cable then a DVI to Composite cable will not work.
At some point you have to convert the Digital signal to Audio and that requires some sort of electronics.
I tried to search the internet, there no such thing as a DVI to Composite cable.
There is a DVI to Component Video cable adapters. Those Component connectors are YPbPr, the singals are luma (Y), difference between blue and luma (Pb), and the difference between red and luma (Pr).
There is no “AV” there. None of those RCA jacks carry Audio.
Component video cables are color coded Green (Luma or Y), Blue (Pb) and Red (Pr)
The Red of Component video is a different, darker shade of red that whats used for Analog Audio.
What are you really trying to accomplish? If you are Gaming on a Xbox One, PS4 or PC you are better off with a Modern Flat Display.
CRT screens are poor substitutions for Modern Digital video feeds, and expect a huge lost of visual quality unless you got some expensive external video downscallers.
CRT screens are more for older (Retro) consoles, Anything from the Dreamcast on back.