I doubt you can do anything like that within iMovie – at least I’m not aware of any object tracking method or plugin for iMovie.
But I’ll leave the definite answer to any professional out there.Answered Jan, 22 2012
Figure 2: Use these buttons to add and remove files.
When mmg starts up it shows the first and probably most important tab: the input tab. Here you see four different elements. The topmost input box lists all input files. Directly under this box are options that apply to the currently selected input file.
Figure 2 shows the three buttons to the right of the upper list box that can be used to add files to the list box with the add and append buttons and to remove the selected entry with the remove button.
There is a difference between adding and appending a file. Normally, the tracks of all added files are put into the resulting Matroska file in parallel. This is usually the case if you have e.g. a video track, one or more audio tracks and one or more subtitle tracks. They all contain material that belongs to the same timecodes and that has to be played simulatneously.
Appending a file on the other hand will cause all tracks of the second file to be appended to tracks of a previously added file. That way the contents of those tracks will be played one after the other. You can only concatenate tracks that are of the same kind (video to video tracks etc), have the same codec (e.g. MP3 to MP3 but not MP3 to AC3) and the same parameters (e.g. the sample rate must match).
You can tell an added file from an appended one by looking at its name. Appended files and tracks start with "
Figure 3: One enabled and one disabled track. The second track will not be copied into the output file.
Once the user has added at least one input file in the upper list box the second list box will contains all available tracks. Each track is ENabled by default and will be muxed into the resulting file. However, you can change that by simply clicking on the check box right in front of the track's name in the second list box. This is shown in figure 3.
For each of these tracks the user can select track specific options with the input boxes and check boxes below the track listing. These options will be described in the following sections.
To the right of the track list box there are two buttons with which you can control the order of the tracks in the output file. By hitting the up and down the currently selected track is moved in the appropriate direction. There are some restrictions to moving appended tracks around (the ones that start with "
++>") like an appended track must not be the first track etc.
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