I can correct the audio with the equalizer on playback... but can I save the file with the corrected audio?

I have a DVD of a video that I made. Unfortunately there is a loud hum. I can run it through an equalizer (spatializer) and make the audio sound perfect. The problem is i need to mail this file on DVD so I need to resave the video file with perfect audio. Anybody know of any software where I can adjust the audio and resave the file with the adjusted audio?
Thanks,
Ken

This is going to depend a lot on your level of expertise with audio/video programs. You will probably need to “demux” the audio from the video track and use an audio editing program like Audacity to clean up the audio then “remux” the video and audio tracks together again.
You will also need to know what format the audio track is, mp3, aac, dts, etc. So, how comfortable do you feel about doing any or all of this?

I’m pretty new to this, but learning quickly… Looks like I have a date tonight with Google, the terms demux and remux , audacity. Ever used VLC? Does that have the capability to do what I need to do? I was able to get the audio sounding great with VLCs equalizer (spatializer).
Thanks again for your insight,
Ken

Welcome to the forums KenNC.

I know how I would try to remove a constant noise from an audio stream within a dvd, but it is not a simple process. I can outline it if you wish. By the way, do you have a menu on this dvd that you want saved? If so, the process will be a bit different.

It would help to know the format of the audio stream. DVDs in the US use three different types of audio, normally AC3, but LPCM and DTS are possible. (DTS is virtually never used by amateurs).

You’ll need to demux the audio and video streams from the dvd-video. You can use PGCDemux for this: http://www.videohelp.com/tools/PgcDemux Make certain to save both the audio and video streams (put a check mark in the box to save the video also).

The tool I would use to adjust the sound is Audacity, a free audio editing program. You can find it here: http://audacity.sourceforge.net/
Get the 1.3.12 beta, and get the ffmpeg and lame libraries as well. http://lame.buanzo.com.ar/
http://manual.audacityteam.org/index.php?title=FAQ:Installation_and_Plug-Ins#installffmpeg

By using the ffmpeg library in Audacity, you should be able to import an AC3 audio stream. LPCM would go straight in without problems, but sometimes even using the ffmpeg library, you have issues importing AC3 into Audacity. If you do, then you’ll have to uncompress the audio stream to .wav.

One tool for uncompressing AC3 to .wav is called HeadAC3he: http://www.videohelp.com/tools/HeadAC3he Very simple to use.

Still with me? At this point you’ll want to import the AC3 or .wav file into Audacity and follow this guide for removing noise from your audio stream: http://wiki.audacityteam.org/index.php?title=Noise_Removal

Once you have removed the noise, click on File–>Export and save as an AC3 file. It will need to be 48khz to be dvd compliant and no more than 448kbps.

Now its time to rebuild the dvd-video. For this, you’ll need an authoring program, the video stream you saved earlier and this new ac3 file you just made. There are some simple authoring programs available, but you won’t be able to make very snazzy menus with them. You may already have an authoring program, since you made a dvd from a video earlier, but here is a free one that will accept these demuxed streams: http://www.videohelp.com/tools/DVDAuthorgui

[QUOTE=KenNC;2581489] Ever used VLC? Does that have the capability to do what I need to do? I was able to get the audio sounding great with VLCs equalizer (spatializer).
Thanks again for your insight,
Ken[/QUOTE]

Actually you can use VLC to output just the audio track, but that in and of itself really won’t help. Better to demux the streams and go from there.

Although I’m sure PGCDemux can do the demux for you I think DGindex is easier.

Try DGindex and import VOB-> File->save project and demux video…You’ll have a raw m2v and ac3 file that you can author a new DVD with DVDauthorGui .

Then use Audactity Noise removal as Kerry posted above.

One last question ; What brand is this DVD disc ?
If it is a low quality disc that could also be the problem.

Hey all,
I can’t thank you enough for your help and advice. Between what you guys told me and one of my students (I teach High School) the video is fixed and looks and sounds great. Thanks for your time and effort you put into your emails. Kerry, the detail in your posting was a huge help.
Since you had such great advice for me on that, I have one other problem… I have this ex-wife who is always…