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Importing media - Avisynth wiki
http://avisynth.nl/index.php/Importing_media
Examples: AviSource("d:\xvid_dts.avi") Alternatively, use DirectShowSource with an AC3/DTS directshow filter like AC3Filter (make sure that downmixing is turned off, unless you want it to be downmixed or it is stereo/mono) and an AVI-AC3/DTS splitter, or ffdshow (with DTS set to libdts). Use AC3Filter and create the script:
Avisynth AC3 Support - VideoHelp Forum
https://forum.videohelp.com/threads/186647-Avisynth-AC3-Support
The AC3 is a 5.1 (6 channels) surround file about 300Mb big. What I want is to do is to frameserve the video (XviD) and audio (AC3) with Avisynth without downmixing the sound to 2.0 (2 channels, stereo), but I just cant get it to work. I tried the AC3Source.dll plugin for Avisynth, but it downmixed the sound to 2.0 (2 channels, stereo) and ...
NicAudio - Avisynth wiki
http://avisynth.nl/index.php/NicAudio
Description . NicAudio is an audio source plugin for MPEG Audio/AC3/DTS/LPCM and other uncompressed formats.. Requirements [x86]: AviSynth+ or AviSynth 2.5.8 or greater [x64]: AviSynth+ Syntax and Parameters. NicAC3Source / NicDTSSource NicAC3Source (string, int "channels", int "DRC")
AC3 DRC0 via Avisynth Script - Doom9's Forum
https://forum.doom9.org/showthread.php?t=182972
DRC is an information in the AC3 Audio File. FFMPEG can delete this information with the FFMPEG Decoder (-drc_scale 0). But now the problem, if u work with a frameserver and tunneling your AVS script, FFMPEG cannot decode the AC3 file, you must do this with the frameserver, btw. indexer.
AC3 DRC0 via Avisynth Script - Doom9's Forum
https://forum.doom9.org/showthread.php?p=1945716
If i use an Avisynth script via FFMPEG, FFMPEG skips this line. Since Avisynth doesn't touch the original source, your best bet is to use nicsource as ac3 decoder and set drc to zero. This will ignore that flag. If you can use something else, you can use eac3to which will set dialnorm to -31 (which means "don't do anything").
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