FYI - MKV is the most flexible container available as it can support multiple (and just about any) Video and Audio streams as well as Streaming, Chapters, Subtitles and more advanced features like Ordered Chapters (like seamless branching) and even Menus. The good (and bad) news is that it is open source so any dev is free to support the format ... or (unfortunately) only part of the format. So the reality is that while the many creation and playback SW (/HW) supports some of the features, few (if any) support all of them. One downside of the open source approach is that there is no Tech Giant pushing this format so support can be erratic. That said it would now be the most popular choice by those backing up content from their original sources for HTPC playback (and dare I say also by "file sharers" on the net)....DivK is dead and the next "best" would be MP4 (but that is not streamable friendly) or the TS varieties (but while streamable it lacks muxed in Chapter Support). The good news is many HW devices now also support MKV playback as well (but most will not support the more advanced features).
I'll have to test what PD supports in it's MKV authoring at some point!
For these interested in the MKV spec -->
http://www.matroska.org
PD 64 Bit-Win10 64 Bit-32GB RAM-80TB HDD
Sony FX6 - 500Mbps 4k/50p AVC-I HLG
Canon XF400 - 150Mbps 4k/50p AVC
GoPro Hero6 Black
Pana HS700-28Mbps 1080/50p AVC (High@L4.2)
Canon HV20-HDV 25Mbps 16:9 1440x1080/25p MPEG