Rendering issues

Hi all, I am struggling with the rendering process. I finished my project but when I render it and use windows movie maker , the quality of the images is disappointingly low, I tried to use avidemux but it didn’t work same can be said about Wax. Avs video editor is hard to use as the minimum duration of a frame is 0.50 plus you can’t set a default duration for all the frames…I feel stuck…I spent so much time on this animation that my eyesight has been affected. Can anyone help me get a best quality video and suggest a free video editor? Thanks

Hello keyboard,

Can you give some details ?
Os type/version , Synfig version , Render options