Encode input stream mpg2 to output stream h264 CBR

Question

Output should be:
- 2,5 Mbit/s CBR H.264/mpeg4
- Audio 128kbit/s joint stereo mpeg2

Command i am using as last looks like this, and stream is not CBR.

ffmpeg.exe "udp://xxx.xx.xxx.x:xxxx?fifo_size=700000&buffer_size=12000k&pkt_size=1316" 
-vf "hqdn3d" -c:v libx264 -refs 4 
-minrate:v 2500k -me_method hex -maxrate 2500k -sc_threshold 45 -bufsize 300k -b:v 2500k-bsf 
h264_mp4toannexb -flags +ilme+ildct+loop+mv4+cgop -profile:v baseline 
-x264opts 8x8dct -x264opts mixed-refs -x264opts weightp=0 -g 100 
-c:a mp2 -ab 128k -ar 48000 -fflags +igndts+genpts+sortdts -f mpegts 
"udp://@xxx.xxx.x.x:xxxx?buffer_size=100k&pkt_size=1316" -threads 0 -v 0

Answer 1

Try

ffmpeg "udp://xxx.xx.xxx.x:xxxx?fifo_size=700000&buffer_size=12000k&pkt_size=1316" 
-vf "hqdn3d" -me_method hex -sc_threshold 45 -refs 4 -flags +ilme+ildct+loop+mv4+cgop -g 100
-c:v libx264 -minrate:v 2300k -maxrate 2372k -bufsize 2400k -b:v 2300k
-bsf h264_mp4toannexb -profile:v baseline 
-x264opts mixed-refs:weightp=0:nal-hrd=cbr  
-c:a mp2 -ab 128k -ar 48000 -fflags +igndts+genpts+sortdts
-threads 0 -v 0
-f mpegts -muxrate 2500k "udp://@xxx.xxx.x.x:xxxx?buffer_size=100k&pkt_size=1316" 

Added nal-hrd=cbr to x264opts and removed 8x8dct which is used in High profile.

If your input is interlaced, deinterlace it (add yadif filter).