What is max bitrate and max channels supported by PCM audio format?

[Bonie81]

Just a quick Q.
What is max bitrate and max channels supported by PCM audio format?
Can PCM support 6 channel or more?

Thanks in advance.

[jagabo]

PCM on a DVD, PCM in a WAV file, or PCM audio in general?

[Bonie81]

I mean PCM on a DVD.
but broadly both, PCM on a DVD, and PCM in a WAV file.
what is technical difference between PCM on a DVD and PCM in a WAV file?

[yoda313]

Here it is for both bluray and dvd:

https://www.videohelp.com/hd

bluray and hd-dvd

Linear PCM up to 9 channels (Max 27.648Mbps)


https://www.videohelp.com/dvd

48000 Hz
32 - 1536 kbps
Up to 8 audio tracks containing Dolby Digital, DTS, PCM(uncompressed audio), MPEG-1 Layer2. One audio track must have MPEG-1, DD or PCM Audio.


Generally speaking if you mean pcm for wav as in cd audio creation it is something close to 1500kpbs and at 44100khz.

Edit - I believe on dvd pcm audio is limited to 2 channel. I may be wrong on that for dvd but I know multichannel pcm is possible and implemented on some bluray movies.

[Bonie81]

yoda313

Thanks for information.
Thanks for the links as well.

Video Technical Info for HD DVD and Blu-ray Disc.
Linear PCM up to 9 channels (Max 27.648Mbps)

Does it mean HD DVD or a Blue Ray encoded with 7.1 channel 27.648Mbps bears highest quality of sound?
I will try renting one from Block Buster and really wanna feel the effects of the PCM.

Thanks!

[yoda313]

Does it mean HD DVD or a Blue Ray encoded with 7.1 channel 27.648Mbps bears highest quality of sound?

Bingo!The only thing is I don't think many movies state the audio bitrate on the packaging. - they do usually list the video bitrate. Try going online to look up the movie in question to see what the movie was produced at.

Also be aware that 7.1 is not common on bluray movies yet. Even some of the newest movies haven't been released in 7.1 audio.

[poisondeathray]

Many titles use DTS-MA or TrueHD which are forms of lossless compression - If the studio took a LPCM track and used one of those instead, it would sound identical, just take up less space

[Bonie81]

yoda313

Thanks!
gone thru' the links you provided, found very informative.
visiting Block Buster tonite after searching on internet, i just wanna feel effect of 5.1 surround PCM effect
and rip little piece, to test various encoders.

[jagabo]

I believe DVD only supports 2 channel PCM, 48,000 samples per second, 16 bits per sample. That equates to 1,536 kpbs.

WAV supports 65535 channels, up to 65535 samples per second, and up to 65535 bits per sample. Finding an application that could deal with all that may be difficult though!

[Cornucopia]

There's what's available in the spec, and there's what's available on existing equipment.

Audio CD allows for 4CH, LPCM, 16bit, 44100Hz, but NO players or discs were ever made, AFAIK.
Audio CD with the HDCD extension allows for 2ch, LPCM, 20bit, 44100Hz, but discs and players are still rare.
DVD-Video allows for 8CH, LPCM, 24bit, and 96000Hz (although not ALL at once due to bitrate limitations), but NO players or discs have been made that support 6-8CH LPCM, and most don't support 96kHz.
LPCM WAV audio doesn't support multichannel (>2) audio unless it conforms to the WAVFORMATEX(?) spec, those are still in the minority, plus channel assignment is a mess, so there's little support with media.

BluRay or WMV-HD, using their forms of multichannel LOSSLESS, or DVD-Audio/SACD is the best real available option.

Scott

[Bonie81]

Thanks to...
jagabo, yoda313, poisondeathray, and Cornucopia.
Thanking You for Responses.
The discussion here is very informative.

Thanks folks!

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