hello everyone

i got a problem and in spite of researsh here (perhaps bad ..) i don't find any soluce

I dl a big concert (1h31 / 2,0go)
this movies is compose by a file 1h30 - 1,9go and a small file, the end : 1min / 20mo

the soud is perfect on two movies

if a demultiplexe the sound and the picture in mp2 and m2v (in order to join the small part in the end) .. i got 2 file, same lenght ... but after authoring .. the sound is sync with the pic and more you see the movie, more the gap appears and after 1h30 the gap is 2sec



thx a lot for all