[FFmpeg-user] Tunning GOP Paramaters

[mohamed hefny]

Hello,
 
 I want to transcode a video file (MPEG2 - PAL) to have the following GOP specifications:
 
 * M=3 , N=12
 * GOP Type: Close
 
And I tried these parameters: -flags +cgop -sc_threshold 1000000000  -g 12 -bf 3, which didn't work. 
So could anyone help me please to output files with above specs.
 
Thank you in advance.
 
 
Best regards,
  Mohamed Hefny
  DVB Engineer
  Egyptian Satellite Co