I know that some of you must gone through this because sound synch problems are a major issue with film.

I have a 20 minute movie. The first 8 minutes are fine. The last 12 minutes have sound synch problems with video. I used AVIdemux, marked the last 12 minutes and adjusted it to -1000ms which I guess is 1 second fall back on the sound, whatever, but it worked and now has near perfect sound synch. I saved it with AVIdemux Video copy changed the original MPEG AAC mp4a sound to mp3 128 bit rate. It's mostly dialog with light background music so super high quality sound is not needed.

The first few seconds of this marked section that I resynched comes out in a green hazy tint but then it goes back to normal. That would be nice to fix but I can live with it. When I saved the film, only the last 12 minutes of the movie that I marked and resynched was saved not the entire 20 minutes. So, is there a way to save the entire movie, the first 8 minutes plus the last 12 minutes with AVIdemux. Or what must I do to recombine the now two separate movies with avidemux. The issue is also that the separate first 8 minutes are in the AAC audio format and the last 12 minutes of the film where I made the synch correction is in mp3 audio format. What is the best way to save the whole film in AVIDemux or recombine the entire film?