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FPS - AviSynth
https://avisynth.sinsixx.com/FPS.html#:~:text=The%20AssumeFPS%20filter%20changes%20the%20frame%20rate%20without,the%20pitch%20of%20the%20resulting%20audio%20gets%20shifted.
AssumeFPS / AssumeScaledFPS / ChangeFPS / ConvertFPS ...
http://www.avisynth.org.ru/docs/english/corefilters/fps.htm
AssumeFPS (clip1, clip2, bool "sync_audio") AssumeFPS (clip, string preset, bool "sync_audio") The AssumeFPSfilter changes the frame rate without changing the frame It only sets the framerate-parameter If sync_audiois true, it also changes the audio sample rate by the same ratio, the pitch of the resulting audio gets shifted.
FPS - Avisynth wiki
http://avisynth.nl/index.php/FPS
AssumeFPS (clip clip1, string preset [, bool sync_audio]) clip clip / clip1 = Source clip. float fps = If supplied, the new framerate is set to fps. Due to the way frame rates are stored, fps must be converted to the closest ratio of 32-bit signed integers, eg, 33.3333 → 329833/9895 (33.3332996) int numerator = int denominator = 1
FPS - AviSynth
https://avisynth.sinsixx.com/FPS.html
AssumeFPS (25, 1, true) # Convert frame rate to PAL, also adjust audio. SSRC (44100) # Restore audio sample rate to a standard rate. The +4% speed up is conventionally used for displaying 24fps film on PAL television. The slight increase in pitch and tempo is readily accepted by viewers of PAL material. ChangeFPS
Using AviSynth 2.5 (page 13/15 ... - AfterDawn: Guides
https://www.afterdawn.com/guides/archive/using_avisynth_page_13.cfm
AssumeFPS(25, audio_sync=true).SSRC(48000) Turn NTSC video into slow motion footage: Mpeg2Source("NTSC_Source.d2v") AssumeFPS("NTSC_Double") When To Use It AssumeFPS is most useful for Changing NTSC film sources to PAL or progressive PAL to NTSC film framerate. It's capability for keeping audio sync is generally only good for two channel audio.
AssumeSampleRate - Avisynth wiki
http://avisynth.nl/index.php/AssumeSampleRate
AssumeSampleRate(clip clip, int samplerate) Changes the sample rate of the current clip without changing the number of samples. This changes the sample rate, pitch, playback speed and running time of the audio. It will also affect synchronization with the video. Examples Fix an audio sync problem: AviSource("video_audio.avi")
Fixing Gradual Audio Desync | SA LP Tech Support Fort Wiki ...
https://salp.fandom.com/wiki/Fixing_Gradual_Audio_Desync
If you're lucky, the fix is simple: keep the audio as-is, and adjust the video to match the audio's length. If you're using AviSynth, this is a fairly simple fix: video = video.AssumeFPS(video.FrameCount() / (video.AudioLengthF() / video.AudioRate()))
Avisynth won't work properly on Windows 10... - Doom9's …
https://forum.doom9.org/showthread.php?t=176369
AssumeFPS(24, true) From here I save this on a AVS file, and I simply drag and drop that file to MPC-HC and the video now plays at 24fps with the audio sounding correct. However, ever since I updated my OS from Windows 7 to Windows 10, Avisynth no longer works properly even after re-installing the application.
24p -> 24000/1001? [Archive] - Doom9's Forum
https://forum.doom9.org/archive/index.php/t-142951.html
This is because American TV shows film at 23.976, slightly slower like 29.97, so the audio can be played back at 48000Hz to match. Note that with AssumeFPS it doesn't adjust the audio, so you'd either want to AssumeSampleRate(48000) if you have 48048Hz audio, or otherwise SSRC(48000) to sync up the audio.
Framerate conversion 23.976 to 24 avisynth - VideoHelp Forum
https://forum.videohelp.com/threads/349069-Framerate-conversion-23-976-to-24-avisynth
The assumefps style conversion is just reversing what is normally done to film/celluloid or digital film equivalents in studios. 24.0fps film is interpreted in editors as 23.976 for NTSC distribution (except blu-ray, which can be 24.0) . Both audio & video is slowed down from 24.0 to 23.976.
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