Program Of The Week
MKVtoolnix
This is a video handling tool for MKV files. I wouldn't exactly call it a video editing tool because you can neither see the video frames nor re-encode them into other codecs/ filetypes like VirtualDubMod does.
Its installer creates a desktop icon named MKVmergeGUI. Once you open a MKV file in it, you can see the list of tracks (video, audio streams and subtitles) and chapters of video if available. Since MKV files can contain multiple audio streams and subtitles, you might want to retain only one audio stream and subtitle. Just select the tracks you want, then set the output file (see under FILE tab) and finally click on START MUXING. It takes less than a minute for a 700 MB file. So, the first important function of MKVmerge is Remuxing the tracks.
The second important function of MKVmerge is to Split/ Append MKV files (like VirtualDubMod does for AVI files). For Splitting, go to the GLOBAL tab, then ENABLE SPLITTING. You can select either a given size or duration or your own timecodes in HH:MM:SS. Do not select LINK FILES. Set the output file (see under FILE tab) and finally click on START MUXING. For joining two segments, click on APPEND under INPUT tab after opening the first segment and then set the output file (see under FILE tab) and finally click on START MUXING.