yes @manuel its getting bit hard even after setting
  -b:v 25M -minrate 25M maxrate 25M -bufsize 25M it not generating CBR mode
output and i will try for 1 & 2 pass once and convey you if i get the
constrained VBR

On Fri, Aug 11, 2017 at 11:20 AM, Manuel Tiglio <tig...@icloud.com> wrote:

> I have had the same problem with both CBR and constrained VBR, even with
> two passes, and no luck in really controlling the bitrate as specified. I
> posted it a couple of weeks ago but did not get anyone who could really get
> CBR and or 110% or 150% or any other constrained VBR or at least exactly
> how to reproduce any results.
>
>
> > On Aug 10, 2017, at 10:35 PM, akash kulkarni <kul.akash...@gmail.com>
> wrote:
> >
> > 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.com@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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