its fine @jmkhoo1 atleast you tried and its appreciated...
input file is of constant bit rate mode after executing command i am
getting variable bit rate...
so question was how i get the CBR mode output

On Thu, Aug 10, 2017 at 7:59 PM, jmkhoo1 <jmkhoo1-at-yahoo....@ffmpeg.org>
wrote:

> Apologies. I should have tried it out first. You are correct. Even
> specifying r:v and -b:v failed.-------- Original message --------From:
> jmkhoo1 <jmkhoo1-at-yahoo....@ffmpeg.org> Date: 8/10/2017  9:28 AM
> (GMT-05:00) To: FFmpeg user questions <ffmpeg-user@ffmpeg.org> Subject:
> Re: [FFmpeg-user] CBR and bitrate
> If you mean a constant frame rate, use -r:v 25. If you actually mean
> bitrate, use -b:v and -b:a. I think you might want to look at the x264
> switches to make sure that it is encoded and a constant bit rate, though I
> am fairly sure specifying a bit rate will do it.-------- Original message
> --------From: akash kulkarni <kul.akash...@gmail.com> Date: 8/10/2017
> 7:18 AM  (GMT-05:00) To: FFmpeg user questions <ffmpeg-user@ffmpeg.org>
> Subject: [FFmpeg-user] CBR and bitrate
> 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.
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