Video from RCA and Audio from HDMI

[arthas]

Hello,

i connected raspi external amlifier via analog 3.5mm jack and to monitor via RCA. But i got very bad background noise via analog output.

So i bought a HDMI to analog converter and i tested it works.

i want to use HDMI to analog converters analog sound output and RCA video output. Is it possible?

[fruitoftheloom]

You can configure the RPi to use a specific interface using the command line. "amixer cset numid=3 N" where the N parameter means the following: 0=auto, 1=analog, 2=hdmi. Therefore, to configure the Raspberry Pi to use the hdmi output:

amixer cset numid=3 2

[Burngate]

I'm not sure it's possible

The video, definitely, cannot drive both HDMI and RCA, since it uses the same encoding hardware.
HDMI is the prefered destination, with RCA as fallback, so HDMI video will be used if possible.
So if a HDMI sink is found or forced, the encoding hardware switches to HDMI, and the HDMI output drivers are enabled.
Otherwise the encoding hardware switches to RCA, leaving the HDMI output drivers with no data

To send video to the RCA but audio to HDMI would require the HDMI hardware to provide "padding" data where the video data would have been
That would have been possible if the designers of the SoC had thought to do it, but if there's a HDMI sink for audio, it's assumed the video can go there as well, so why not use it?

All this can be refuted by one of the BCM engineers coming here and telling me I'm talking through my hat