Audio "hiccuping" when trying to shift it at beginning of video

[behind8proxies]

I'm running the latest version of Avidemux on Windows 7.  I'm trying to dub in an MP3 onto an mpg video that I took.  However, when I try to shift the audio, instead of delaying the audio x number of milliseconds, it seems to start the audio immediately, then start it over at the shift time.

What's going on???

Any help would be appreciated.

[zakk]

Maybe because mpg container wants mp2 or AC3 sound. Change audio codec or container.

[behind8proxies]

I'm not sure exactly what you're talking about.

I've tried selecting the Audio Output to be both mp2 and AC3 and I get the same result when I try to play it. 

This is before I even try to save the output file.  It's happening while I'm adding the audio to the video and then testing it in Avidemux to get the shift time right.

[AQUAR]

Just for something to try.
First, use copy mode and mux them together into a good container (MKV).
Then reload the new file and time shift the audio.