Re: stuttering jumpy mp4 videos

Rather than exporting via Media Encoder, render it in After Effects using one of the "editing" codecs (eg. Animation, ProRes), then check this rendered, uncompressed movie. If it's stuttery, then there's a problem with AE. If it's not, THEN compress this movie in AME. If the compressed result is stuttery, it's a problem with your compression settings in AME.

I assume your original comp is set to 25fps in After Effects? If not, then you're asking for trouble trying to render/compress it in one pass at a different frame rate.

Hope that helps.

- Paul