How can I remove a portion of from the middle of a movie? Quicktime Player help:


  With QuickTime Player you can quickly remove a portion of the
  beginning or end of a movie or a movie clip to make it shorter or
  remove unwanted content.


I want to remove the portion starting at 03:08 and ending at 03:49 of the movie, preferably through an applescript like the following:

tell application "QuickTime Player"
    activate
    trim document 1 from 0 to (4 * 60 + 41.75)
end tell 


Am pretty sure QT PRO can do it.
You can use Quicktime 10.x to split the movie into multiple clips, and then trim the individual clips. When you're done editing the individual clips and you save/export the movie, you get exactly what you want: one single, continuous movie, sans the parts you trimmed.

Split a movie into clips

In QuickTime Player, drag the playhead (the small diamond) in the timeline to the location where you want to split your movie.

Choose Edit &gt; Split Clip.
Your movie splits into two clips.

To split one of the clips in two, select the clip, drag the playhead (now represented by a red vertical line) to the location where you want to split the clip, and then choose Edit &gt; Split Clip.
Your movie is now split into three clips.

To continue splitting clips, repeat step three.

When you’re done splitting clips, you can rearrange your clips or click Done.



https://support.apple.com/kb/PH5884
I haven't investigated it, but there may be an analogous AppleScript API for working with clips.