DVDA and 24/96 PCM

JasonMilo wrote on 7/3/2003, 1:24 PM

I saw in an earlier version of the manual that DVDA only could do 16/48 PCM, but I can't find that statement in the current manual. Is this restriction still in place, or can can I do 24/96 PCM audio without having DVDA "optomize" it to 16/48?

Jason Milo

Comments

SonyEPM wrote on 7/3/2003, 2:36 PM

[deleted]

JasonMilo wrote on 7/3/2003, 5:18 PM

I made a couple of test DVDs and played them back using Power DVD. I did one DVD at 24 / 48 PCM and the other at 24 / 96 PCM. I looked at the properties inside of Power DVD these are the stats for the audio streams. When I created the DVDs in DVDA, I tweaked the "Optomization" settings to use PCM and not AC-3. I also did not notice any optomization being performed (created the files for the DVD real fast).

24/ 48 Audio: LPCM 2.0 2304Kbps

24 / 96 Audio: LPCM 2.0 4608Kbps

These audio stream rates do match the 24 / 48 and 24/96 bit/sample rates.

On playback though, using an external clock, the 48K sample rate disk played as expected, and the 96K file played back incorrectly (it played at 48K). I'm also wondering since Power DVD was able to see the approperiate bit rates, but was unable to play at 96K, if there is a limitation in the PowerDVD software that downsamples 96K files to 48K. How can I determine if the files are playing back as 16 bit or 24 bit?

SonicEPM, since you said it isn't possible, could you explain why the audio stream rates on the DVDs matched the 24/48 and 24/96 rates? Not that I'm doubting you, I just need to clear up my confusion.

Thanks,

Jason

JasonMilo wrote on 7/3/2003, 5:41 PM

FYI - It looks like there is a 48K sample rate limitation on the version of PowerDVD that I have. There is a new feature on the latest WinDVD and PowerDVD that will play back 96K sample rate files at full resolution.

I'm wondering if the latest version of that software will playback the 96K sample rate on that DVD properly?

Jason

JasonMilo wrote on 7/4/2003, 10:09 PM

JasonMilo wrote on 7/7/2003, 3:26 PM

BUMP

jetdv wrote on 7/7/2003, 4:14 PM

I don't understand why you keep "bump"ing when your question was answered?????

JasonMilo wrote on 7/8/2003, 10:48 AM

Jetdv....the question was not answered. I am still confused why my DVD seems to have the higher rates beyond 16/48. I want to know if the DVD actually contains this data, or are the extra 8 bits just taking up space.

SonyEPM wrote on 7/8/2003, 2:29 PM

[edit of earlier post]

Sorry for the confusion, I was wrong.

DVDA supports no-recompress for 16 and 24 bit PCM stereo .wav files with sample rates of 48 or 96khz. If you bring those into DVDA, they should not be touched- the green check mark in the optimize window will tell you the recompress status (green checkmark= no-recompress).

RBartlett wrote on 7/8/2003, 3:06 PM

Well done for persevering with this qualification. Good for everyone involved and watching. Thanks SonicEPM. Another nail in the competitors coffin.

JasonMilo wrote on 7/8/2003, 9:52 PM

I didn't think I was going crazy....thank you for clearing that up.

It is amazing that such an inexpensive product does the hi-res audio on DVD-Video!!!! I don't think there is any other package out there for the price of DVDA that can compete with the the certified AC-3 encoding and 24 /96 support!!!! Sonic Foundry should be promoting these items in all of the magazines...especially the 24/96 uncompressed PCM support!!!

Sonic Foundry....You guys rock!!!!