XnView Software

I would like to convert a MNG to its GIF equivalent (patent sucks, but most browser don't support MNG out of the box).

nconvert -colours 256 -out gif test.mng

only gives me a one-frame gif with the first frame of the mng

If I split the MNG to PNG :

nconvert -colours 256 -n 0 449 1 -out gif -o ...

Hi,

I had an old version of XnView, perfect to view MNG.
Now the newest versions only shows the first frame, and doesn't start any animation.
is there anything special to do ?

Thanks