[MEncoder-users] Merging H.264/AAC movies [HELP]

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Hello people,

I tried but with no success yet to merge 2 H.264/AAC movies into one
output, using this command:

"mencoder -of lavf -lavfopts
format=mp4:i_certify_that_my_video_stream_does_not_use_b_frames -oac
copy -ovc copy first.mov second.mov -o merged.mov"

The mencoder output after running the above configuration looks like this:
-----------
MEncoder 1.0rc1-4.1.2 (C) 2000-2006 MPlayer Team
CPU: Intel(R) Xeon(R) CPU X3210 @ 2.13GHz (Family: 6, Model:
15, Stepping: 11)
CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
success: format: 0 data: 0x0 - 0xe3ed3
Quicktime/MOV file format detected.
VIDEO: [avc1] 1024x768 24bpp 30.000 fps 0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:7 fourcc:0x31637661 size:1024x768 fps:30.00 ftime:=0.0333
** MUXER_LAVF
*****************************************************************
You have certified that your video stream does not contain B frames.
REMEMBER: MEncoder's libavformat muxing is presently broken and will
generate
INCORRECT files in the presence of B frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit
videocodec: framecopy (1024x768 24bpp fourcc=31637661)
Audio format 0x6134706d is incompatible with '-oac copy', please try
'-oac pcm' instead or use '-fafmttag' to override it.

Exiting...
-----------

Then I tried to force a new tag with '-fafmttag 0xff', and there is a
floating point exception:
----------
videocodec: framecopy (1024x768 24bpp fourcc=31637661)
Forcing output audio format tag to 0xff.
audiocodec: framecopy (format=ff chans=2 rate=48000 bits=16 B/s=192000
sample-0)
VIDEO CODEC ID: 28
AUDIO CODEC ID: 15003, TAG: 0
Writing header...
[mp4 @ 0x85a7c54]Warning, using MS style audio codec tag, the file may
be unplayable!
[mp4 @ 0x85a7c54]track 1: sample duration is not set
Floating point exception
----------

Can anyone help or give me hints about how should I configure mencoder
to merge H.264/AAC movies?
Or at least is it even possible to do so?

Thank you.

With kind regards,
Sebi Onofrei