CD, and SVCD also constrain you to relatively low GOP (Group of Pictures) sizes. For 30 fps material the largest allowed GOP size is 18. For 25 or 24 fps, the maximum is 15. The GOP size is set using the keyint option.
11.8.1.3. B... for CIF resolutions.
* keyint: Used to set the GOP size. 18 for 30fps material, or 15 for 25/24 fps... encoder. The libavcodec MP2 is far from being as good as the other two libraries, however it should a
