AC3 video file format :
Dolby Digital, formerly known as AC-3, is a digital audio compression format. Dolby Digital takes advantage of how the human ear processes sound. When coding noise is close to the frequency of an audio signal, that audio signal masks the noise so that the human ear hears only the intended audio signal.
Best way to cut/trim/split AC3 file :
GiliSoft Video Editor — Cut/trim/split AC3 file.
1) Launch GiliSoft Video Editor
Once installed GiliSoft Video Editor, Launch GiliSoft Video Editor.
2) Select one way to cut AC3 file
There are 3 ways to cut AC3 file in the easy video editing software:
a) Easy Video/Audio Cutter - Cut one AC3 file to several small AC3 clips.
Video/Audio Cutter - Cut wanted AC3 clips from a lot of AC3 files.
c) Advanced Video/Audio Cutter - Cut wanted AC3 clip after video editing(added watermark,subtile...)
3) Load File
Click 'Add File(s)' button, Select "AC3 - Dolby Digital(.ac3)" in its "Files of type" combo box.
Add your AC3 file, GiliSoft Video Editor will preview your AC3 file directly.
4) Select Start time, and End time.
5) Click 'Start' button to start to cut your AC3 file.
GiliSoft Video Editor is very powerful AC3 Splitter and AC3 Cutter, split AC3, cut AC3 without re-encode, So It is very fast and without any quality loss.
Buy GiliSoft Video Editor