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TimeStretch - Avisynth wiki
http://avisynth.nl/index.php/TimeStretch
The effect is also known as time-stretching . float rate = 100.0. 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.
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 …
Audio speed distorsion when using an avisynth script ...
https://forum.videohelp.com/threads/382330-Audio-speed-distorsion-when-using-an-avisynth-script
Audio speed distorsion when using an avisynth script + Reply to Thread. Results 1 to 6 of 6 Audio speed distorsion when using an avisynth script. ... I don't know what's happening and how I could slow down the audio speed. I've tried so many filters (re-assign fps, resample to 44100), ... in vain. Code: DirectShowSource("D:\vid\loubna_0_10.mp4
AssumeSampleRate - Avisynth wiki
http://avisynth.nl/index.php/AssumeSampleRate
AviSource("video_audio.avi") # Let's say that this clip loses audio sync: # by the end, the audio is behind by 200 milliseconds. Ar = AudioRate # original audio sample rate dur = AudioDuration # total duration in seconds adj = -0.200 # correction needed (decrease audio duration by 200 msec) # Adjust audio duration: AssumeSampleRate ( Round (dur / (dur+adj) * Ar)) # Video and audio …
How can I speed up AVIsynth processing? - Doom9's Forum
https://forum.doom9.org/showthread.php?t=171924
A new build of AviSynth 2.6 MT was very recently released so I'd stick to that build. Again, for people here to help you with specific details, you'd have to post your script. By altering the script and changing the sequence of operations, you can probably gain a massive performance boost with minor changes to quality.
Using AviSynth 2.5 (page 13/15): Changing Framerate ...
https://www.afterdawn.com/guides/archive/using_avisynth_page_13.cfm
sync_audio Setting this to True will keep the audio in sync by resampling it. When you're done you'll usually need to resample the audio to return it to its original samplerate. You can do this with the SSRC filter. Example Code Speed up an AVI encoded from DVD from NTSC filme framerate (23.976fps) to PAL framerate: AviSource("NTSC_film_Source.avi")
Speed Up a Clip with VirtualDub
https://lparchive.org/meatsupport/SpeedUpAClipWithVirtualDub/
Speed Up a Clip with VirtualDub By balldunk OK here's how to do a speed up in virtualdub while keeping audio and video synced. Really you should do this in avisynth instead because with virtualdub you have to split the video up and encode it in bits then put it …
PAL to NTSC using AviSynth - AfterDawn
https://www.afterdawn.com/guides/archive/convert_pal_to_ntsc_page_4.cfm
AudioDub(Video,Audio) #Split frames into fields SeparateFields() #Put frames in correct order, including duplicates SelectEvery(10, 0,1,2,3,4,5,4,7,6,9,8,9) #Slow down from 60fps to 59.94fps AssumeFPS(60000,1001,sync_audio=true).SSRC(48000) #Resize fields to NTSC-compatible size Spline36Resize(720,240) #Interlace video frames Weave()
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