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Importing media - Avisynth wiki
http://avisynth.nl/index.php/Importing_media#:~:text=For%20loading%20your%20AVI%20with%20audio%20you%20need,available%2C%20but%20certainly%20not%20for%20all%20of%20them.
FAQ loading clips - Avisynth wiki
http://avisynth.nl/index.php/FAQ_loading_clips
For loading your AVI with audio you need (1) a VfW (Video for Windows) codec to open (that is decode) your video in AviSynth and an ACM (Audio Compression Manager) codec to open your audio in AviSynth. For many video and audio format such codecs are available, but certainly not for all of them. Here (...) you can find those codecs.
AviSource - AviSynth
https://avisynth.sinsixx.com/AviSource.html
From v2.04 up there is built-in support for ACM (Audio Compression Manager) audio (e.g. mp3-AVIs). AviSource is also no longer able to open WAV-files, which must be accessed by using WavSource From v2.06 the pixel_typeparameter (default YUY2) allows you to choose the output format of the decompressor. Valid values are "YUY2", "RGB32" and "RGB24".
Importing media - Avisynth wiki
http://avisynth.nl/index.php/Importing_media
For loading your AVI with audio you need (1) a VfW (Video for Windows) codec to open (that is decode) your video in AviSynth and an ACM (Audio Compression Manager) codec to open your audio in AviSynth. For many video and audio format …
How to bring MP4 files into an AviSynth script « 720p ...
https://compactvideo.wordpress.com/2012/02/01/how-to-bring-mp4-files-into-an-avisynth-script/
If the video compression is x264 and the audio is AAC then your source files can be brought into an AviSynth script in a very similar fashion to AVCHD Lite. Once again it is vital that, along with your installation of AviSynth itself, you also have the FFMS2 plugin located within the AviSynth plugins folder.
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