Please Help with Radeon HD4650 and Yamaha RXV1800 problem

[littlePiG]

Hi all,

I have just bought and installed a new Palit Radeon HD4650 video card in the hopes of getting Dolby TrueHD and DTS HD-MA bitstreamed to my Yamaha RXV1800. The card has an onboard HDMI port which is connected to the AVR. Upon firing everything up all I am getting is PCM stereo sound.

Am running Vista Ultimate 32 bit with PDVD8 Ultra. I have set PDVD Audio output to HDMI. When I set the output mode to Dolby/DTS passthrough it keeps reverting to PCM. In the Windows sound control panel for the HDMI output the configure option only lists stereo output and under properties neither DTS Audio or Dolby Digital tests produce any output also the only sample rate listed is 48.0 KHz.

Any suggestions as to what might be wrong would be appreciated.

Thanks in advance.

[prerich]

Originally Posted by littlePiG

Hi all,

I have just bought and installed a new Palit Radeon HD4650 video card in the hopes of getting Dolby TrueHD and DTS HD-MA bitstreamed to my Yamaha RXV1800. The card has an onboard HDMI port which is connected to the AVR. Upon firing everything up all I am getting is PCM stereo sound.

Am running Vista Ultimate 32 bit with PDVD8 Ultra. I have set PDVD Audio output to HDMI. When I set the output mode to Dolby/DTS passthrough it keeps reverting to PCM. In the Windows sound control panel for the HDMI output the configure option only lists stereo output and under properties neither DTS Audio or Dolby Digital tests produce any output also the only sample rate listed is 48.0 KHz.

Any suggestions as to what might be wrong would be appreciated.

Thanks in advance.

The 4xxx cards will not bitstream - the only capable bitstreaming card available is the Xonar HDAV1.3 and you can only order it from the UK or Canada at this time. The 4xxx cards will output 7.1 LPCM (your software will do the decoding - it will read as 7.1 PCM on your receiver - watch you sample rate of the movie - most movies are at 48khz/24bit or even 16bit. You do have some higher bit rate movies out there.

Question - did you intstall the new Realtek hd audio driver for your 4XXX video card? This is a must - also need to make sure in your audio setup in Vista that you have chosen the new HD audio as the default (located in Control Panel under sound) You also should make sure that your outgoing sample rate is at least 48khz/24bit in the sound options in Control Panel also - Since you are using hdmi you can put it at 192khz. PM me later iin the day when I get home - I may be able to walk you through it - or better yet - Go to the AVSforum there's an entire thread on this.

[littlePiG]

Thank you. The Realtek driver was the missing part. After installing that I can now get PCM sound on 6 channels. I do have to set PDVDs output to 6 speakers rather than to HDMI. Set to HDMI I still only get sound out of the front 2 speakers even though on the AVR it lights up all six channels on the front display. Odd.