Movie with a loud buzz in the audio track. How can I filter

[Mooshie]

I have a mpeg movie with a very obnoxious buzzing noise in the audio track. Even with the treble turned all the way down it still persists. Is there a way to seperate the audio from the video, remove the buzzing sound without doing too much damage to the original audio, and recombine the audio and video? If so please posts the steps for accomplishing it. Thanks.

[dinesh]

First you need to have some sort of sound editor(CoolEdit or even Nero Wave Editor will do).
1) Open the MPEG-1 file in VirtualDub.
2) Click File -> Save WAV. Enter a file name and a new WAV file is created.
3) Open this wav file in the Sound Editor. Somewhere there should be Equalizer options. Try changing levels for some frequencies(mainly reduce the frequencies your buzz noise has)
4) Preview the sound, Change values till you are satisfied. Note however this method may even eliminate some actual soundtrack sound.
5)Save the Wav file.
6)Open the original video file in TMPGEnc as Video Source and the new wav file as Audio source and encode it to a new mpeg.

[BillyB]

I ran into this exact situation and I did what dinesh describes except there's a noise reduction filter in cool edit that works great to remove the noise. You'll need Cooledit 2000 and a small section of the audio that has just the buzz/humm in it. Morpheus is a great source to find Cool editing files. There's a noise reduction plugin that I've got installed as well, but I think what I'm going to describe is standard on Cooledit 2000.

What you do is open your soundtrack audio in cooledit. Hightlight a tiny section that only has hum on it. Choose Transform->noise reduction->noise reduction. Click "Get Profile from selection" and funky colored lines show up. Click Close. Highlight the first minute or so of your audio file. Choose Transform->Noise Reduction->Noise Reduction then click OK. It will remove the "profile" noise (hum) that you selected before. Listen to the first minute and see if you notice the change and if it's not too much. Undo the noise reduction and go through the process adjusting the Noise Reduction Level slider. The default settings should have "Remove Noise" at the bottom of that settings by the way.

I find 80% will get rid of all the humm but there's a fine line where you start to take out sound you want to keep. Do several tests on the first minute or other parts then deselect any highlighted parts and apply the noise reduction to the entire file. You'll know if you cut out too much if the sound becomes "metallic" or flat.

Playing with the Noise Reduction Settings will give you even better results but I strongly recommend reading the help files before changing things like Precision factor etc...

After the file is processed and sounds okay, save the wav and open your original video in Virtualdub. In the audio section choose WAV audio and point it to the WAV you just made. Choose direct stream copy for both audio and video and save it. Viola! Now I'd reprocess it with TMPEg and make it back into a nice neat VCD file.

[cybermage26]

Im guessing you are talking about Lord Of The Rings centropy which has a rather harsh buzz in the RIGHT channel of audio.. this is what I found in a forum about it, even if you dont have LOTR, this will fix it anyhow.


OK, I read A LOT of forum posts concerning this matter, and I can now safely say that I have transformed the TS's sound to an amazing quality. All the hiss is gone, plus there is a 400% amplification in the sound (cause I thought the original one wasn't as loud as it should). If you want to check it out, do the following:

- Open Cooledit 1.0 (or later version I suppose), and load the wav file, which you have extracted from the mpg.
- Select the very first few seconds of the movie (where you can normally see "A New Line Cinema Production" or sth), where there is absolute silence (except, of course, from the hiss).
- From the Transform Menu select Noise Reduction -> Noise Reduction. On the popup window click on "Get Profile from Selection" and put the Noise Reduction Level to around 90. Then click OK and wait for about 40 mins (per CD). When it's done, you'll have a complete hiss-free version of the sound. (What I have actually done by that, is to "subtract" the hiss from the complete sound file, so only the good stuff remains).
- If you want to increase the volume afterwards, select the whole movie, and from the Transform menu select Amplitude -> Amplify. On the popup window click on Calculate, and you should get a value of around 450-500%. Click OK, and wait some more. You now have the best sound for LOTR you can have...