[FFmpeg-user] drop frames for real time streaming?

[lucie Lemonnier]

Hello, 
I stream a video with multiple overlays but I can't reach 25 fps to output frame rate.
example : ffmpeg.exe -i video.mp4 -vf "movie=video1.mov [mv];movie=video2.mov [mv2];[in] crop=1920:1080:2565:0 [tin];[mv] crop=1920:1080:2565:0 [tmv];[mv2] crop=1920:1080:2565:0 [tmv2];[tin][tmv] overlay=0:0 [tout1];[tout1][tmv2] overlay=0:0" -an -vcodec mpeg4  -f rtp rtp://192.168.54.105:1234
Is it possible to drop frames to obtain a real time streaming output?
Thanks.
Lucie