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TimeStretch - Avisynth wiki
http://avisynth.nl/index.php/TimeStretch#:~:text=Changes%20speed%20while%20maintaining%20the%20original%20pitch.%20If,fast.%20The%20effect%20is%20also%20known%20as%20time-stretching.
How to fix speedup with AviSynth? - VideoHelp Forum
https://forum.videohelp.com/threads/353056-How-to-fix-speedup-with-AviSynth
To slow down audio, you can use various audio editors e.g. audacity, timestretch in avisynth with soundout TimeStretch(rate=83.41666667) Soundout() Timestretch is expressed as a percentage, so 25/(30000/1001) * 100 =~ 83.41666667 (but it won't be NTSC DVD compliant @ 720x480 , 25 frames per second)
TimeStretch - Avisynth wiki
http://avisynth.nl/index.php/TimeStretch
Changes speed while allowing pitch to rise or fall, like the traditional analog vari-speed effect. If rate =200, the audio will play twice (200%) as fast; if rate =50, the audio will play half (50%) as fast. Rate control is implemented purely by sample rate transposing.
FPS - Avisynth wiki
http://avisynth.nl/index.php/FPS
AudioTrim(0, -9.0) ## adur (audio duration) = 9.00 sec, sample rate=48000 AudioDub(A) ## vdur=10.01, adur=9.00 #return AssumeFPS(24, sync_audio=false) ## vdur=12.50, adur=9.00 (audio unchanged) #return AssumeFPS(24, sync_audio=true) ## vdur=12.50, adur=11.238, sample rate=38438 ## (audio sample rate is changed by the same amount - in this case, by …
How can I speed up AVIsynth processing? - Doom9's Forum
https://forum.doom9.org/showthread.php?t=171924
While working with AviSynth, I didn't have any issues or configuration complications using the MT version; perhaps I was lucky. With quad-core i7 processor, in my case, it still runs at 100% CPU with or without MT, but MT is still a bit faster. I found AviSynth+ to be faster than AviSynth 2.6, but AviSynth 2.6 MT to be faster than AviSynth+.
PAL-speedup command in Avisynth ? - VideoHelp Forum
https://forum.videohelp.com/threads/392581-PAL-speedup-command-in-Avisynth
The AviSynth PAL speedup command is "AssumeFPS(25)". Why you would think otherwise is beyond me. When you use AviSynth, of course you have to do a full reencode. I have no idea what changefps in TSMuxer does as I've never used that program. In AviSynth ChangeFPS(25) doesn't do the speedup, but only adds one duplicate frame every second.
Main Page - Avisynth
What is AviSynth? AviSynth is a powerful tool for video post-production. It provides ways of editing and processing videos. AviSynth works as a frameserver, providing instant editing without the need for temporary files.. AviSynth itself does not provide a graphical user interface (GUI), but instead relies on a script system that allows advanced non-linear editing.
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