Have you tried the various audio settings on GTV HD ?

Yes I did. Chromecast offers Dolby Digital, DTS and newer audio formats. It offers Dolby Digital and DTS  if I set the audio extractor to 5.1. If I set the audio extractor to 2.0 Chromecast doesn't offer any audio format at all.

Could it be a problem of the audio extractor ? Should I buy a newer one ?

I just ordered a new HDMI audio extractor, which another member recommended in another thread as working.

This is the one I ordered: https://www.amazon.de/AmazonBasics-Audio-Extractor-Konverter-Audio-SPDIF-Stereo/dp/B07KRWYN4R/ref=sr_1_3?crid=27D6EBFQZ24OA&keywords=hdmi%2Baudio%2Bextractor%2Bamazon%2Bbasics&qid=1701035939&sprefix=Amazon%2BBasics%2BAudio%2BExtractor%2Caps%2C136&sr=8-3&th=1

Will report back if it solves my audio problem.

Received the Amazon audio extractor today and immidiatly did a test. Same result as with my old audio extractor - no audio output.

What else can I do ?

Are you sure that you can not set the sound out from the Chromecast/Googletv to PCM 2.0.
That is what the extractor accepts.

MM

Audio options on the Chromecast /w Google TV under advanced sound options are:

• Dolby Digital
• Dolby Digital Plus
• Dolby Atmos with Dolby Digital Plus
• DTS

That's all. Would it be worth to try to connect audio from the audio extractor via spdif/coax instead of analog to the BV to get sound ?

I just remembered that I had a sound output problem when I used an Atlona extractor.  I decided that it could be an EDID problem - see my post (and the rest of the useful thread) here:

/forum/other/fixedapple-tv4k-connecting-to-a-beovision-7-40-non-hdmi#post-1952030

This all sounds a bit strange - I think from a bit of googling that others have used Chromecast with Google TV and an extractor just as an audio streaming input, so fundamentally it should work. Have you tried unplugging the DVI connection to the TV to see if you just get sound?

It could also be worth trying other leads (hdmi to dvi) and also checking the audio lead that you have used between extractor and TV PC input. Also try connecting another analogue input (phone etc) to the TV's PC input whilst the rest of the setup is connected to the DVI input.

Also worth checking that the audio extractor is getting sufficient power - I used a 12W Apple adaptor with mine.

SPDIF could be worth a try also but I am not sure how the TV then choses the right audio input.

Dare I say it could be worth trying yet another audio extractor? I did send a couple back to Amazon for a full refund when I was experimenting!