in after effect

create a new comp an go import files broswe to the fisrt frame of the sequence
click it u should have some options
in the open box under file name and type

there should be one for traga sequence (i use traga so dont know if it changes but there shoul be an option for sequence)
tick that box

click open

in the window where ur comp and all other files go there should be one for the sequence
if it has imported as a sequence it shold appear as one file with u drag and drop onto the time line
u should then be able to play this back

adjust colours ect and expor/render as an .avi