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View Full Version : whats the HIGHEST Bitrate you can use with UNCOMPRESSED Audio


willndmb
2009-01-12, 01:31 PM
SSIA
EVERY time i try to make a dvd on a Mac using uncompressed wavs as the audio it tells me it can not burn because the bitrate/data rate is to high
thanks

example i had a 48 minute video with a bitrate of 8 and it said it was to high to burn on a standard dvd-r

LeifH12345
2009-01-12, 01:34 PM
:hmm: Are you trying to burn a DVD-Audio?

What program?

stantheman1976
2009-01-12, 07:18 PM
SSIA
EVERY time i try to make a dvd on a Mac using uncompressed wavs as the audio it tells me it can not burn because the bitrate/data rate is to high
thanks

example i had a 48 minute video with a bitrate of 8 and it said it was to high to burn on a standard dvd-r

You can go up to 9.8MBps including data and audio and shouldn't have any troubles. You should have no problem doing 8MBps data rate with a 44.1/16 WAV.

Whatever program you're using is trying to keep you under that to be safe. Is there a way to disable the warning it's giving you and create it anyway?

schmoe75
2009-01-12, 07:27 PM
You can go up to 9.8MBps including data and audio and shouldn't have any troubles.
Incorrect for the question asked.

For it to have given that message at 8 mbs, you could have a setting wrong somewhere. Check them all in FCP or whatever you're in.

According to the calculator
http://www.videohelp.com/calc.htm
8227 for 48 min w/ LOSSLESS audio (FYI - its the 1536 audio bit rate option)

stantheman1976
2009-01-12, 09:57 PM
He never says he's using FCP. On a Mac he very well could be but it's never stated for sure. 9.8MBps is the limit to keep a DVD standard. That includes video and audio bitrates. If he's using 44/16 audio he could use 8MBps for the video and the audio would be a hair over 1.5MBps. That goes just under the DVD spec of 9.8MBps total. There may be a setting in his program that tries to keep it under 8MBps total or something like that.

I use this calculator BTW:
http://dvd-hq.info/bitrate_calculator.php

schmoe75
2009-01-12, 10:24 PM
LPCM audio = 1.5 MBps = 1536 kbs
:popcorn:

stantheman1976
2009-01-13, 12:25 AM
LPCM audio = 1.5 MBps = 1536 kbs
:popcorn:

Saying just a hair over 1.5 was just me trying to be too technical.:D

You can actually go over 9.8MBps but you can't guarantee that some players won't choke on anything higher. Assuming the OP has not missed any details there's no reason his program should stop him from making a DVD with 8MBps video and 1.5MBps LPCM audio unless the program automatically tries to keep projects at 8MBps or under total. We still don't know what program for sure so maybe it's just a safety feature of that particular app to keep people who don't know what they're doing from making non-spec discs. That's just my guess.

paddington
2009-01-13, 04:37 AM
That includes video and audio bitrates. If he's using 44/16 audio he could use 8MBps for the video and the audio would be a hair over 1.5MBps. on a Video DVD ? :hmm:

willndmb
2009-01-13, 07:35 PM
sorry guys
YES its a Mac with iMovie, Final Cut Pro, DVD Studio Pro
DVDSP is where i get the error message when i try to build/format ie burn the disc

i will try another one soon and use the calc to see if it works

stantheman1976
2009-01-13, 08:22 PM
on a Video DVD ? :hmm:

Yes. 44KHz/16 bit audio is 1536kbps. 8MBps video + 1.5MBps LPCM audio is 9.5MBps which is under DVD standard of 9.8MBps maximum for audio and video combined. Like I said, you can actually go over 9.8MBps, somewhere up to about 10.5 I think, but it will be out of spec and many players might choke on the above average data rate.

Edited:
Oops. I wasn't paying attention. Sorry about that. 48KHz/16 bit.

paddington
2009-01-13, 09:18 PM
.on a Video DVD ? :hmm:

Yes. 44KHz/16 bit audio is 1536kbps. 8MBps video + 1.5MBps LPCM audio is 9.5MBps which is under DVD standard of 9.8MBps maximum for audio and video combined. Like I said, you can actually go over 9.8MBps, somewhere up to about 10.5 I think, but it will be out of spec and many players might choke on the above average data rate.

Edited:
Oops. I wasn't paying attention. Sorry about that. 48KHz/16 bit. :D

.

schmoe75
2009-01-13, 09:33 PM
:nerd:

schmoe75
2009-01-13, 09:35 PM
DVDSP is where i get the error message when i try to build/format ie burn the disc
Settings...if they're all correct, can you ignore the message and go ahead & create the VIDEO_TS folder?

stantheman1976
2009-01-13, 10:15 PM
. :D

.

I had it partially right. That's more than I usually get with my old lady.:lol4:

willndmb
2009-01-15, 07:17 PM
so i looked at my setting today and nothing jumped out at me
there was one with a bitrate for video but nothing for overall bitrate or for audio
the setting is also for it you use dvdsp to encode, i always use compressor out of fcp though
i guess i will have to wait till i have a dvd to try it out on again since i got rid of the files for the one in question after burning it with ac3

Leehro
2009-01-19, 10:01 AM
Yes it is 8227kbit for video if you have 1536kbit audio.

If you open the inspector on your settings in compressor (command-I or double click the MPEG-2 target), you should see a menu like the screenshot.

If you're using VBR, keep the MAX at or under 8.0 Mbps. If you're using CBR, keep the avg at (or under) 8.0Mbps.

8.0Mbps = 8192Kbps, which is as close as you can get it to 8227 in compressor without going over

Unfortunately some videos are unusual and encoders just won't listen to your max bitrates, and give you a spike. In something like CCE you could edit the VAF file and manually change the bitrate, but I don't think compressor lets you tweak very much.

willndmb
2009-02-02, 11:53 AM
ok i have made a file with lpcm audio and i did NOT get the error message :)

it was set for 2 pass vbr
average 7.0 max 8.2 (didn't see leehro post till after the fact)

thanks

now i am going to make a default setting so i can just set it and not have to adjust the settings