[FFmpeg-user] Muxing external H264 bitstream with libavformat

[SF]

I am currently testing the OpenH264 library (http://www.openh264.org ).

In the scope of theses tests, i am trying to mux the raw bitstream generated by this library into a MP4 container 
with libavformat, but something is going wrong : i create all the stuff (container, codec context, ...) and i build the
packet to write from the raw data generated by openH264. The mux operation itself seems OK, but when i try to decode
the video with ffplay, i get the message : 

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fcd2c0008c0] moov atom not found0/0

I guess i am missing something when writing the header of the container, but what ? Any hints ?

Thanks.