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I have a program for DVD (mp2, mpeg2) video editing but the only audio control is level.

I need to tweak the tone balance of two files so need a program, preferably freeware / open source (or a non-crippled time-limited demo as hopefully only need to do this once), that has say a 10 band graphic equaliser to process the audio while simply re-recording the video with no processing. Each file is around 2.5GB / running time 70 minutes.

I have looked and found numerous audio programs but non mention support for mp2 video.

I know possible to extract the audio from the video then in the DVD editor mute the audio on the video file and add a separate audio track.
The problem is aligning the audio and video and being certain separate audio processing does not slightly change the audio speed over 70 minutes running time. Even a second difference would be noticeable.

Any suggestions will be appreciated.

You should be able do de-mux the audio using one of several different free apps. The resulting audio file will be AC3/Mpeg Layer 2 or PCM.

Then load the audio file into Audacity (its free) apply the Equalization (32 bands) and save the file back as PCM (uncompressed) if you will be adding it in a dvd app........or in the same format as the source if your going to remux it. It will be exactly the same length as the previous file.

One downside is that you will be doing a re-encode of the audio so it will lose quality ever so slightly but you may not be able to tell.

Thanks Twingo for replying.

I've never done this but know with the right programs what you describe is possible in several steps. In particular I was unsure if programs like Audacity could be trusted not to slightly change the running time. Hence why I would like to find a program that will work directly on MPEG2 files.

I accept there will be slight quality loss but I am hoping overall that balancing the audio will outweigh any processing distortion.

Going back 10 years when I would have been transferring Hi8 to SVHS I would have simply put a graphic equaliser in the audio lines.