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Importing Media into AviSynth
http://avisynth.org.ru/docs/english/advancedtopics/importing_media.htm
In general there are two ways to load your audio into AviSynth: using an AviSynth plugin which is designed to open some specific format. using the DirectShowSource plugin. A list of all these plugins and their accepted formats is given below. 1) AviSynth filters and plugins which are designed to open specific formats: WavSource - WAV:
Importing media - Avisynth wiki
http://avisynth.nl/index.php/Importing_media
AVI with audio: 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.
AudioDub - Avisynth wiki
http://avisynth.nl/index.php/AudioDub
AudioDub. From Avisynth wiki. Jump to: navigation, search. AudioDub (video_clip, audio_clip) AudioDubEx (video_clip, audio_clip) AudioDub takes the video stream from the first argument and the audio stream from the second argument and combines them into a single clip. If either track isn't available, it tries it the other way around, and if that doesn't work it returns an error.
how to extract audio from avi via avisynth - VideoHelp Forum
https://forum.videohelp.com/threads/380925-how-to-extract-audio-from-avi-via-avisynth
The easiest is still ffmpeg, which has avisynth support . You need to match versions (32bit avisynth requires 32bit ffmpeg binary) . You could even encode everything audio & video and mux at once with ffmpeg libx265 if you wanted to Quote 18th Oct 2016 01:56 #5 vhelp Member Mar 2001 New York But I use avisource () for my avi's.
FAQ loading clips - Avisynth wiki
http://avisynth.nl/index.php/FAQ_loading_clips
It is always possible to demux your audio from the AVI file and load it separately in AviSynth using an audio decoder, but in some cases (for example: AVI with MP2/MP3/AC3/DTS audio) it is possible to load it directly in AviSynth. 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 …
Using AviSynth 2.5 (page 7/15): Cutting and Joining ...
https://www.afterdawn.com/guides/archive/using_avisynth_page_7.cfm
AlignedSplice joins two clips, keeping the audio in each clip in sync with its respective clip. In other words, if the audio in the second clip starts 30milliseconds after the video, it will remain synchronized with the video after the splice as well. More than two clips can be spliced from a single instance of this filter.
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