[FFmpeg-user] CBR and bitrate

[Dragan Randjelovic]

use nal-hrd option:

-x264opts nal-hrd=cbr:force-cfr=1 ( -b:v 25M -minrate 25M maxrate 25M
-bufsize 25M )



*hrd=cbr*

Regards.


On Thu, Aug 10, 2017 at 3:28 PM, jmkhoo1 <jmkhoo1-at-yahoo.com at ffmpeg.org>
wrote:

> 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.akash123 at gmail.com> Date: 8/10/2017
> 7:18 AM  (GMT-05:00) To: FFmpeg user questions <ffmpeg-user at 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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