[FFmpeg-user] CBR and bitrate

[akash kulkarni]

hello everyone

i have file with CBR and when i am converting it to other format by using
following command i am getting VBR both video and audio

ffmpeg -i input.mp4 -y -r 25 -c:v libx264 -look_ahead 0 -preset veryfast
-b:v 25M -c:a aac ouput.MTS

so How i can get the output file in CBR mode and frame rate 25.