Need some X264 VFW muxing advice

[fight2win]

One of my friends who has hd tv transmission has captured a space documentary (3 hrs.) and has encoded it to x264, avi with ac3 audio (2 audio streams, cantonese & mandarin), and it is spanning over 3 cd's, fortunately, he also has english subs for them (vobsubs from some discovery dvd), but he has also split the subs in sync with cd's, so now is it possible to make a single stream (avi or mkv or mp4) out of 3 avis by joining them somehow, and at the same time, also muxing subs with them and excluding the 2nd audio stream, can someone give some advice, i know mkvtoolnix does not accepts x264 avi material, what to do, please help...

[Koti]

i know mkvtoolnix does not accepts x264 avi material, what to do, please help...

Under the muxing Tab / Add command line options

--engage allow_avc_in_vfw_mode

Allows storing AVC/h.264 video in Video-for-Windows compatibility mode, e.g. when it is read from an AVI

Or , extract the avc and audio you wish to keep from the avi's and mux to mp4's (yamb) - then add/append in mkvtoolnix

[bond]

Under the muxing Tab / Add command line options

--engage allow_avc_in_vfw_mode

Allows storing AVC/h.264 video in Video-for-Windows compatibility mode, e.g. when it is read from an AVIdont use that

Or , extract the avc and audio you wish to keep from the avi's and mux to mp4's (yamb) - then add/append in mkvtoolnix yes, do this
this is made very easy with my avi2mp4 script described here:
http://forum.doom9.org/showthread.php?t=108172