Muxing MKVs adds 200MB

[XenoPhex]

I recently tried to create an MKV file with the following streams:
Video 1.MP4 - 407.4MB (H.264 encoded file, no audio)
Sub 1.srt - 64KB
Audio 1.MP3 - 55.3MB (LAME encoded file)
Audio 2.MP3 - 55.3MB (LAME encoded file)

When I mux the file with MKVToolnix (GUI), I seem to get a file with a size of 703.5MB and not around 520MB (the added totals of all the streams). I understand if it's a little higher then 520MB for the MKV container info, but an extra 200MB seems absurd. Does anyone have an explanation for the 200MB of bulk?

[poisondeathray]

I've never seen this happen and I use mkvmergegui often.

Are you using the newest version 2.5.2 ?
Are you sure the 4 streams are the only contents?
Can you try it again?
What if you use gdsmux (comes with haali splitter package) ie. haali mkv muxer?

[XenoPhex]

I'm on OS X, so I can't use mkvmergegui or haali splitter.

Also, MKVToolnix uses version 2.5.1 of mkvmerge to my understanding. And I have to select each stream to add by hand, so it doesn't appear that I added more then those 4 streams.

[poisondeathray]

2.5.2 is the lastest version, for Windows at least, not sure about mac

http://forum.doom9.org/showthread.php?t=120648

http://www.bunkus.org/videotools/mkvtoolnix/win32/mkvtoolnix-unicode-2.5.2-setup.exe

Not sure if this is a mac issue?