[MEncoder-users] Re: Join MP4 Files?

[Matt]

DEF <shaker_doc <at> yahoo.com> writes:

> > 
> > Thanks in advance.
> > 
> 
> IF you are the one who made the original files, and
> you_are_sure_that_your_video_streams_do_not_use_b_frames,
> then you should be better off with the lavf muxer.
> Your command is by default using the avi muxer which
> IIRC does not mux mp4.
> 


I am creating the original files using ffmpeg.

Here's my latest try:
mencoder -fafmttag 0x706D -of lavf -lavfopts 
i_certify_that_my_video_stream_does_not_use_b_frames:
format=mp4 -oac copy -ovc copy
output.mp4 output2.mp4 -o JoinMe.mp4

I end up crashing mencoder with this message:
[mp4 @ 00B634D4]track 1: sample duration is not set

Could you help me clean up my command line or give me an
example of the proper command?  Thanks again.