AssumeSampleRate
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Latest revision as of 04:24, 18 September 2022
AviSynth+
Up-to-date documentation: https://avisynthplus.readthedocs.io
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.
[edit] Examples
- Fix an audio sync problem:
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 are now in sync. # (optional) restore original sample rate. #ResampleAudio(Ar)
- Play video and audio at half speed:
AviSource("video_audio.avi") # Play video at half speed: audio will be out of sync AssumeFPS(FrameRate/2) # Play audio at half speed: (pitch will be lowered by an octave) AssumeSampleRate(AudioRate/2) # Video and audio are now in sync. # Equivalent to calling AssumeFPS(..., sync_audio=true) (see below)
[edit] See Also
- AssumeFPS: sync_audio
- If true, the audio sample rate is changed by the same amount; the pitch of the resulting audio is shifted.
- If false (the default), the audio is unchanged; this means the audio will lose synchronization over time.
