audio compression?

lucrecia_ · Post by **lucrecia_** » Thu May 27, 2004 2:46 am

I'm not sure if this should belong in this section or the video software seciton but I need to know how to change an uncompressed wav file into one that is compressed using cbr.
The reason why I want to do this is because VirtualDub told me that there was something wrong with the vbr encoding and told me to recompress the wav file. I was able to obtain the uncompressed wave file but I'm stuck as to how recompress with a constant bitrate encoder and then attack it back to the video... I guess one of the questions would be what is that constant bitrate encoder?

^^; My first time using these types of programs... not sure what to do.
Help much appreciated~

madmallard · Post by **madmallard** » Thu May 27, 2004 6:36 pm

what are you trying to do? Edit? Or build a final version? a distro version?

lucrecia_ · Post by **lucrecia_** » Sat May 29, 2004 5:29 am

M... how should I put it. I'm just trying to split a video file that a person ripped for me off a DVD into 2 files instead of one. But when I tried doing that with the original wav source, the sound was messed up. At the end of the files that were split, the screen already stopped playing yet there's about 8-9 seconds worth of the audio file still going while the screen already stopped. So I decided to fix up the sound file of the original video(as Virtual Dub suggested), attach it back to the original unsplit video, and then try splitting again to see if I could get rid of the extra sound. So I'm stuck at the recompressing stage right now. I guess I'm editing the file in a sense, not really for distro or anything.

madmallard · Post by **madmallard** » Sat May 29, 2004 11:29 am

when you say messed up, how?

and what program did you use?

(this sounds familiar)

Eek-1 · Post by **Eek-1** » Sun May 30, 2004 1:59 am

..what is that constant bitrate encoder

Download and install LAME ACM codec -- click here

In VirtualDub, open up audio compression and there you'll find Lame MP3.
Select any of the CBR ones. Those are constant bitrate.

lucrecia_ · Post by **lucrecia_** » Tue Jun 01, 2004 10:34 pm

When I said messed up, I was talking about the extra sound that existed in the split video at the end (the extra ~10 seconds). I was using VirtualDub to do this.

As for the LameAMC codec, in what directory do I put the unzipped files so that VirtualDub can find them? I read through the readme.txt and couldn't understand a thing about the building and releasing the codec. But all the files they were talking about were already available from the zip file so I think they already "built" and "released" the codec?

Thanks for the help.

Eek-1 · Post by **Eek-1** » Wed Jun 02, 2004 2:42 am

lucrecia_ wrote:..the extra sound that existed in the split video at the end..

You can't "Direct Stream Copy" and split a VBR-encoded audio because that's what happens when you did.

lucrecia_ wrote:As for the LameAMC codec...

Unzip to any folder. Right-click on LameACM.inf (it's the one which Type:Setup Information ) and choose Install. If you get a warning, just click "Continue Anyway". Once installed you can delete the files.

lucrecia_ · Post by **lucrecia_** » Sun Jun 06, 2004 1:10 am

Thanks! The option is there now.
Just one final question regarding the compression.
I picked one of the Lame MP3 conversion options (192kbps) and then saved the file. The files turned out to be many many times bigger than the original one (original file was almost 1GB and the estimated file size for the new version was about 114000MB). If the file is supposed to be that big, I definitely wouldn't have room on my hard drive for it. Or is there a way to compress that down to a more reasonable size?