Andrea, we will update and add.

I tried to add simple ffv1.avi file (use with avi_pcm_s16 sound)

It doesn't play smooth in CinGG for me (for 1080p/30 fps), but plays in Mplayer (but frame forward/backward seems to work in Cin, just slowly)

I had no problem playing with 1920x1080/29.7fps but not sure why.