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AudioDub - Avisynth wiki
http://avisynth.nl/index.php/AudioDub
AudioDub - Avisynth wiki AudioDub 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.
DirectShowSource - Avisynth wiki
http://avisynth.nl/index.php/DirectShowSource
With seeking disabled and trying to seek backwards, the audio stream returns silence, and the video stream returns the most recently rendered frame. Note the Avisynth cache may provide limited access to the previous few frames, but beyond that the most recently frame rendered will be returned. bool audio = true Enable audio on the resulting clip.
Importing media - Avisynth wiki
http://avisynth.nl/index.php/Importing_media
In general there are two ways to load your video into AviSynth: using an AviSynth internal filter or plugin which is designed to open some specific format. using the DirectShowSource plugin. Make sure that your clip contains maximal one video and/or one audio stream (thus remove the subtitles and remove other video/audio streams).
LSMASHSource/LWLibavAudioSource - Avisynth wiki
http://avisynth.nl/index.php/LSMASHSource/LWLibavAudioSource
The path to the source file; path can be omitted if the source file is in the same directory as the AviSynth script (*.avs). int stream_index = -1 The stream index to open in the source file. The value -1 means trying to get the first detected audio stream. bool cache = true
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