I am working with a after effect template bought from videohive.net. I have a simple question regarding time stretching, I am composing a photo album video and i insert my own background music into the template. So, i found that the template is moving too fast, thus i wish to use the time stretching option to lengthen the whole video by 150%, but the problem is, i do not wish to extend the background music, so is that any way i can lengthen only the composition but not the background sound? This have been checked by rending the composition into a H.264. Thank a lot for reading.
I am using Adobe After Effects CS6
Mac OS X Version 10.7.5
Simply separate the music by deleting it in the template sub-comp and re-combine it with the stretched comp in the main comp. Read up on pre-composing in the help.