Ho to remove hum from a video mpg file?

[perfection]

I record programs from TV in mpg format and convert then for my personal use to DVD. I find a low underlying hum in the audio track that i would like to remove using some audio filter. My video editing software does not have an audio filter that can do tis - so i would like to know how best this can be done without compromising on the the quality of the video.

Have i to strip the audio from the video track and then multiplex it again on the video editor timeline

Any recommended software that can do this EASILY

In other words i would like to reduce the slight hum in the background of my captured video

Thanks for any help on this issue

[AlanHK]

I've found the latest version of Audacity (1.3.3 beta)'s noise filters much improved on earlier versions.

Also you might try a notch filter for a simple hum (reduces a single frequency band).

See http://audacityteam.org/wiki/index.php?title=Noise_Removal for details on both methods.

Yes, you do have to demux the audio, convert to wave, edit in Audacity, then export back to wave and convert back to AC3 or whatever and remux.
The video will be unaffected.

Otherwise, you might look at ways of reducing the hum to begin with. Perhaps some earthing or better shielded cables.

[redwudz]

This might be better in the Restoration Forum. Moving you.

[rkr1958]

I use Goldwave. You need short segment (e.g., 1 to 3-seconds) of the hum only (i.e., no other audio). Goldwave has a filter that will subtract that noise from the entire audio track. Goldwave only works on wave so you'll have to convert your DVD audio (likely ac3 or mpeg) to wav first. Edit it. Then covert it back to ac3 or mpeg.