What would be the best option for export in Vegas? Do you convert to mkv afterward?
It's a bit difficult to explain for me but here are some points:
MKV is no converting, it's merging of two or more files. MKV is a container for files just like AVI is a container.
The best export option in Vegas therefore depends on the source material you want to merge.
I keep the same bitrate as the video part of the masterfile and merge it with lossless audio. Flac or wav.
You can check the specs of a file with a free program called mediainfo:
http://mediaarea.net/en/MediaInfoOnce you know the specs of the file you want to merge into an MKV you know the export option in vegas. If vegas doesnt have a template you have can customize one into the specs you need.
If you render audio seperate (from a source other than the audio from your videofile) Find out how much Mbps of the videofile is for video and how much is for audio.
I prefer main concept over sony. I render a .MP4 file wich I merge with a flac or wav audio file by using mkvtoolnix. I make chapters with this tool as well.