Merge recorded files

hi i am developing an application with wowza that records a audio/video conversation with multiple persons,

so wowza generates a mp4 file for each person that is sharing your microphone/camera

Until here is everything right, my doubt is how to play all this media in a synchronized way.

Example:

Person 1 starts to share his audio/video on time 00:05s.

Person 2 starts to share his audio/video on time 00:10s.

Those 2 persons keeping talking during 1 minute.

i would like to merge this files in a single file, i tried to use ffmpeg but i kind give up.

Someone with experience in this kind of application can suggest some tools or way to implement this?

thanks

You might be able to do it with VLC:

How to Merge and Transcode Multiple Videos

You might have syncing issues, but if the videos are exactly the same encoding and start at the same time, it might work.

Regards,

Salvadore