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AudioDub - Avisynth wiki
http://avisynth.nl/index.php/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.
Importing media - Avisynth wiki
http://avisynth.nl/index.php/Importing_media
Make sure that your clip contains maximal one video and/or one audio stream (thus remove the subtitles and remove other video/audio streams). If you want to load a clip which contains both video and audio, you have two options: Demux the audio stream and load the streams separately in AviSynth. Try to load the clip in AviSynth.
FAQ loading clips - Avisynth wiki
http://avisynth.nl/index.php/FAQ_loading_clips
No, the video and the audio are decompressed when opening them into AviSynth. There is a modification of AviSynth v2.55 which supports 'direct stream copy' for both video and audio. This modification is called DSynth and can be downloaded here. Perhaps it will be updated and merged into the official AviSynth builds one day.
Using AviSynth 2.5 (page 7/15): Cutting and Joining ...
https://www.afterdawn.com/guides/archive/using_avisynth_page_7.cfm
The audio in the second clip will simply be appended directly to the end of the audio in clip1 with no additional delay. This doesn't affect any delay in the first clip. Example Code Join two clips assigned to variables: clipOne = Trim(0, -1000) clipTwo = Trim(1500, 3000) UnAlignedSplice(clipOne, clipTwo) Select and join 2 clips from one source:
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