mp4box concatenating mixed audio+video and video-only mp4 files

[stic]

Hi everybody,
I would really appreciate if somebody could help in my problem concatenating three video files, where only one of them has audio presented.
Basically I have 3 files:

1# video1_only_h264.mp4 - no audio
2# (video2_h264_audio_aac).mp4
3# video3_only_h264.mp4 - no audio

If I try to concatenate them into one mp4 file with:
mp4box -add video1.mp4 -cat video2.mp4 -cat video3.mp4 -new output.mp4

it results into file, where sound from the video2 begins right after the playback starts. Instead of being synchronized with the video2 position.

Thanks

[stic]

So I've just made silent audio file in the length of the first video with ffmpeg, and muxed it together.
But I'm sure there exists better and more inteligent solution :D
Anybody?

[CarlEdman]

I asked for a generic solution to this problem recently, with no good solutions (for my purposes) found. http://forum.doom9.org/showthread.php?t=163059

[stic]

Actually the solution I found myself is working perfectly in my case. But I thought there could be even simpler option. Seems I was wrong :)