A need to send to a client a video. The video has to be MP4 and i get this suggestion for render within after effects. I understand that it refers to "export" rather than render? I tried to export with those settings, i even incresed the nr of kbs at 3000 but the video has poor quality. What setting i have to use to render out the material as mp4 in AE?
Open the AE project in Adobe Media Encoder, select the comp you want to render and use the presets to export. AE is not really meant to compress files, it is best to render uncompressed from there and then use a compression software to encode for final delivery or use the method described above.
Like Tudor said, it's best to use a dedicated compression application. Both MPEG-4 video compression and H.264 compression benefit from multipass encoding, giving you better visuals and smaller file sizes -- but AE's render queue is not built for multipass.
Has the client asked for any specifics for the MPEG-4 deliverable?
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