Directly altering MPEG layer 2?

[euromuffin]

I have an MPEG-2 video capture whose left and right channels are reversed (damn sloppy ATI AIW drivers under WinXP!). I loaded the file in GoldWave, swapped the channels back, saved to a WAV, and then reencoded and remuxed to a new MPEG-2 file in TMPGEnc.

Now there was a very faint high pitch hum in the original file, and after doing all this, the hum is now slightly louder in the new file.

I guess this was a bi-product of converting from MPEG to PCM and back. Is there any way I can swap the channels without conversion, and thus avoid making the noise louder? Thanks.

[txpharoah]

It may be GoldWave. Try SoundForge. Also, DartPro98 can remove hum/hiss/etc. See the audio area in the guide in my sig.

[euromuffin]

Thanks for the suggestions, txpharoah. I'll try them out.

Euro