Originally Posted by pctechsupport

The origional post was written some time ago but I just stumbled on it. I downloaded and installed mkvmerge.

It does (maybe an upgrade since the origional post) allow you to enter multiple timecodes in a comma delimited field for multiple splits in a single pass.

Originally Posted by mkvmerge guide

The Split section handles how the output file is split into several smaller files. If no splitting is selected then only one big file is generated. If splitting is activated then you can tell mkvmerge to start a new output file after either a specific amount of data has been written to the current file or after a specific timecode has been reached. The accepted formats are:

• For the size: A number optionally followed by the letter 'K', 'M' or 'G' indicating kilobytes (1024 bytes), megabytes (1024 * 1024 bytes) or gigabytes (1024 * 1024 * 1024 bytes). Examples: '700M' or '100000K'.
  
• For the time: The format is either HH:MM:SS.nnn with up to nine digits for up to nanosecond precision or a number followed by the letter 's' indicating a number of seconds. Several timecodes can be entered separated by commas.
  
  Please note that the timecodes refer to the unsplit output stream. Therefore entering '00:10:00,00:20:00' will result in three files of which the first two will be roughly ten minutes long. The third piece will contain the rest of the input stream. This is independent of the 'file linking' feature.
  Examples: '01:20:00' (split after 1 hour, 20 minutes) or '1800s' (split after 1800 seconds = 30 minutes).