TAG | tsMuxer
M2TS and MKV are both video container formats. M2TS format is commonly used for high definition video on Blu-ray Disc and AVCHD. It is based on the MPEG-2 transport stream container and is also known as BDAV MPEG-2 transport stream. However, this format is not as widely supported as MKV by your computer, portable players or standalone devices like HTPC, Popcorn Hour and Western Digital player. So you may need to convert the m2ts format to the common video format like MKV.
I have searched online for a free software tool to convert m2ts to MKV and couldn’t find such a tool to work well. All of the programs that can directly do the work are commercial software. But there are some good ways to do that with a few free programs working together.
1.Import the m2ts to tsMuxer and use the demux function to split the file to separate video and audio raw streams.
2.Use MKVmergeGUI （included in mkvtoolnix） to mux the separate video and audio streams together to an MKV.
This way is simple and fast without quality loss, and if you don’t remove the tracks or subs, etc., it doesn’t reduce the size of the file, for it just packages the file into MKV container without re-encoding the video/audio.
If you want to compress the file to smaller size, you can follow this way:
1.Use HdBrStreamExtractor （the GUI of eac3to) to demux the m2ts. You can extract the video track as MKV file and transcode the audio track to, say AC3 640Bit to get rid of HD sound.
2.Mux the video and audio in MKVMergeGUI.
If you want to reduce more file size, you can transcode your video track to 720p H.264 before muxing it in MKVMerge.
