AAC/MP4 Plugin (Free/GPL) Download - AAC/MP4 Plugin is an incredible tool to have at your disposal
What are some of the reasons that people prefer H.264/AAC over WebM (VP8 and Ogg Vorbis) for web video and audio? Which are deal-breakers for those who won't use WebM? - Quora
Importing Media into AviSynth
Export issue - using H.264/AAC Mp4 file - Help/How To - Shotcut Forum