Thank you for your answer.
I try with the “vglobal” command but the problem is still there. I maybe found the real problem : it s about the “mp4 atoms”. ffmpeg put those “atoms” at the end of the file and for streaming, it must be at the beginning…
The “qt-faststart” can do it but not for a file who change at real time (caused by webcam streaming)…
if you have any other suggestion, it will be great.
Thank you again for your previous answer.
–Vidar