I tried mcomix to read .cbr but it says archive format not supported. Calibre isn't working either, any idea on how to open .cbr files under linux ?

I am looking for a way to create CBR TS file from a high bitrate MXF input file. I have tried to use ffmpeg, but apparently it doesn't do a good job of creating CBR output file so right now I am a bit clueless what I can use. I have tried to use: ffmpeg -i input.mxf -copyts -c copy -muxrate 200M -f mpegts output.ts I only want to add some stuffing. I have also tried to transcode the video with the command: ffmpeg -i input.mxf -vcodec libx264 -b:v 150M -minrate:v 150M -maxrate:v 150M -bufsize:v 140M -acodec mp2 -ac 2 -b:a 192k -f mpegts output.ts but it didn't work out either. I want the output to be completely flat. This could be done by setting the muxrate to a much higher value or by achieving completely CBR video bitrate. The ffmpeg with which I have tried is 3.2.4.