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Topic: Bitrate too low when encoding DVD-Sound (Read 4097 times) previous topic - next topic
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Bitrate too low when encoding DVD-Sound

Here is what I did:

I have a DVD. It is "Massive Attack - Eleven Promos".
I wanted to extract the Audio Tracks from it and encode them to MPC.
The format of the Audio Track is LPCM 1536 kbit/s uncompressed.
Should be of quite good quality I thought.
I extracted the Audio using DVD2AVI, which was no problem. I got a 48 kHz WAV File. Opened it in SoundForge and resampled it to 44,1 kHz using highest quality resampling, and separated the songs. I was quite happy. Everything sounded just fine.
The problem occured when I tried to encode the wav´s to MPC. The bitrate is just too low. I have been using MPC for quite a long time now and am used to bitrates around 200 kbit/s. When encoding these Massive Attack Tracks I get Bitrates from 90 (standard) to 120 (insanse) kbit /s. Don´t you think this is just too low? First I thought that some high frequencies may have been cut off and made a spectrum analysis. But it looks just fine wirh heighs up to 22 KHz.
Any idea why the bitrate is that low. When I rip normal cd´s the bitrate is normal again. Using MPPENC 1.0

Thanks in advance for your replies

Bitrate too low when encoding DVD-Sound

Reply #1 –
Just an idea, try using the Normalize function in Soundforge to normalize the audio, or try the WavNormalize (i think thats what its called) prog thats avaliable from Robertoe's site which uses REplaygain Analysis.

If the levels are to lw i think he psyco-acoustic nature of the compreeor wouldn't operate properly.
Sorry if im completly off the mark here, just a thought. Let us know if it helps.

Cheers,

Krisitan Tippins

Bitrate too low when encoding DVD-Sound

Reply #2 –
Sorry, forgot to mention that - I DID normalize the whole track to 98 % because DVD´s are always that low volume - so that can´t be reason ...

Bitrate too low when encoding DVD-Sound

Reply #3 –
How do they sound?

Are there any noticable artifacts etc. or does it sound fine with the low bitrates? Ther
I havent really got any idea otherwise, hope someone else can help, if i come up with any ideas i'll let you know.

From Frank's FAQ:

Q62: Do MPEGplus supports 128 kbps?
A62: Although MPEgplus codes some kind of music with 120...140 kbps ......

Maybe the audio is just part of that 'Some' catagory   

Kristian Tippins

EDIT:
Stupid idea really, is the source True stero or is a mono source with identical left and right channels?

Bitrate too low when encoding DVD-Sound

Reply #4 –
Man, that was the "problem" - just my stupidity :
The standard in Soundforge was set to 16 Bit 44.1 KHz MONO
So everytime I cut out a Song and "Pasted to New" the "new" file was a Mono File. If I hadn´t sold my Headphones I could have listened to it properly.
Thanks for your Help!
That means: Let´s rip it again - Baby

Bitrate too low when encoding DVD-Sound

Reply #5 –
Haha,

Had to be something simple, glad its sorted now though, 

Kristian Tippins

Bitrate too low when encoding DVD-Sound

Reply #6 –
any tutorials on how to RIP dvd audio? I was searching high and low for it? any pointers?


Thanks

Bitrate too low when encoding DVD-Sound

Reply #7 –
Quote
any tutorials on how to RIP dvd audio?


Use XMPEG to extract the AC3 files from the DVD VOBs, and then use BeSweet to convert those files (if you want to) into whatever format you need. I believe there's a guide describing the process at www.doom9.org

Good luck!

Bitrate too low when encoding DVD-Sound

Reply #8 –
might as well jump in.

Vertical Horizon - Live EP (not sure about  the name, it's a promo i bought as a present for a friend  )

5 in-concert tracks, all from the same recording and performance, compressed with mppenc 1.01a --xtreme:
1. 198.6 kbps
2. 101.5 kbps
3. 106.1 kbps
4. 102.4 kbps
5. 101.7 kbps

the spectral view does not look like they have been compressed in a lossy manner before. they're extracted straight from the original cd anyway.

(but heavy dynamics compression has been applied to all of them... 10 clipped samples in a row? sure thing..)


WTF? :confused:
A riddle is a short sword attached to the next 2000 years.