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AviSynth:Increase Number of Audio Channels - VideoHelp
https://forum.videohelp.com/threads/342231-AviSynth-Increase-Number-of-Audio-Channels
audio = WavSource ("c:\divx_wav.avi") l_ch = GetChannel (audio, 1) r_ch = GetChannel (audio, 2) stereo = MergeChannels (l_ch, r_ch).ResampleAudio (44100) return AudioDub (video, stereo) to dual = mergechannels (a,a) audiodub (v, dual) - is hardly intuitive and obvious and I expect ongoing, to find myself reliving the experience. Quote
MergeChannels - Avisynth wiki
http://avisynth.nl/index.php/MergeChannels
audio channel 1 = A audio channel 2 = B. This is equivalent to using MonoToStereo. For a more complex example, given the following source clips: A and B …
GetChannel - Avisynth wiki
http://avisynth.nl/index.php/GetChannel
Do the same with the audio channels from the AVI file itself: video = AviSource("c:\video+audio2ch.avi") return GetChannel(video, 1) Convert AVI with 5.1 audio to stereo (copy front left and front right )
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