AssumeSampleRate - Revision history

Reel.Deal: add link to avs+ documentation

2022-09-18T03:24:17Z

add link to avs+ documentation

Raffriff42: tweak example

2016-05-18T21:01:39Z

tweak example

Raffriff42: tweak example

2016-05-18T13:39:44Z

tweak example

Raffriff42: add example

2016-05-17T21:52:22Z

add example

Raffriff42: formatting, links, phrasing

2016-01-14T11:31:52Z

formatting, links, phrasing

Raffriff42: added category

2015-11-08T15:22:05Z

added category

Admin: 1 revision

2013-05-09T15:02:25Z

1 revision

76.91.57.122 at 09:52, 2 July 2011

2011-07-02T09:52:59Z

New page

{{Template:FuncDef|AssumeSampleRate(clip ''clip'', samplerate ''int'')}}

AssumeSampleRate (exists starting from v2.07) changes the sample rate (playback speed) of the current sample. If used alone, it will cause desync with the video.

'''Examples:'''

# Let's say that this video is 25fps, 44100hz video clip.
AviSource("video_audio.avi")

# Play audio at half speed:
AssumeSampleRate(22050)

# Play video at half speed:
AssumeFPS(12.5)

# Video and audio is now in sync, and plays in slow-motion.

[[Category:Internal filters]]

← Older revision		Revision as of 03:24, 18 September 2022
Line 1:		Line 1:
		+
		+	<div {{BlueBox2\|40\|0\|3px solid purple}} >
		+	{{AvsPlusFullname}}<br>
		+	Up-to-date documentation: [https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/assumerate.html https://avisynthplus.readthedocs.io]
		+	</div>
		+
		+
	{{Template:FuncDef\|AssumeSampleRate(clip ''clip'', int ''samplerate'')}}		{{Template:FuncDef\|AssumeSampleRate(clip ''clip'', int ''samplerate'')}}

@@ Line 2: / Line 2: @@
 Changes the sample rate of the current clip without changing the number of samples.
-:This changes the pitch, playback speed and running time of the audio.
+:This changes the sample rate, pitch, playback speed and running time of the audio.
 :It will also affect synchronization with the video.
@@ Line 18: / Line 18: @@
   # Adjust audio duration:
   '''AssumeSampleRate'''([[Internal_functions#Round|Round]](dur / (dur+adj) * Ar))
   # Video and audio are now in sync.
 </div>

@@ Line 10: / Line 10: @@
   [[AviSource]]("video_audio.avi")
   # Let's say that this clip loses audio sync:
-  # after 55 minutes the audio is behind by 200 milliseconds.
+  # by the end, the audio is behind by 200 milliseconds.
-  dur = 3300.0   # total duration in seconds (55 minutes x 60)
+ Ar  = [[Clip_properties|AudioRate]] # original audio sample rate
-  adj = -0.200   # correction needed (decrease audio duration by 200 msec)
+  dur = [[Clip_properties|AudioDuration]]  # total duration in seconds
- Ar = [[Clip_properties|AudioRate]] # original audio sample rate
+  adj = -0.200    # correction needed (decrease audio duration by 200 msec)
   # Adjust audio duration:

@@ Line 6: / Line 6: @@
 ==== Examples ====
-<div {{BoxWidthIndent|38|1}} >
+* Fix an audio sync problem:
- # Let's say that this video is 25fps, audio 44100hz.
+<div {{BoxWidthIndent|56|1}} >
   [[AviSource]]("video_audio.avi")
-  # Play video at half speed:
+ dur = 3300.0   # total duration in seconds (55 minutes x 60)
   [[AssumeFPS]]([[Clip_properties|FrameRate]]/2)
-  # Play audio at half speed:
+  # Play audio at half speed: (pitch will be lowered by an [[wikipedia:Octave|octave]])
-  AssumeSampleRate([[Clip_properties|AudioRate]]/2)
+  '''AssumeSampleRate'''([[Clip_properties|AudioRate]]/2)
   # Video and audio are now in sync.
 </div>

← Older revision		Revision as of 15:22, 8 November 2015
Line 18:		Line 18:

	[[Category:Internal filters]]		[[Category:Internal filters]]
		+	[[Category:Audio_filters]]

@@ Line 1: / Line 1: @@
-{{Template:FuncDef|AssumeSampleRate(clip ''clip'', samplerate ''int'')}}
+{{Template:FuncDef|AssumeSampleRate(clip ''clip'', int ''samplerate'')}}
-AssumeSampleRate (exists starting from v2.07) changes the sample rate (playback speed) of the current sample. If used alone, it will cause desync with the video.
+Changes the sample rate of the current clip without changing the number of samples.
-'''Examples:'''
+==== Examples ====
+<div {{BoxWidthIndent|38|1}} >
-  # Let's say that this video is 25fps, 44100hz video clip.
+  # Let's say that this video is 25fps, audio 44100hz.
-  AviSource("video_audio.avi")
+  [[AviSource]]("video_audio.avi")
   # Play audio at half speed:
-  AssumeSampleRate(22050)
+  AssumeSampleRate([[Clip_properties|AudioRate]]/2)
-−
- # Play video at half speed:
- AssumeFPS(12.5)
-  # Video and audio is now in sync, and plays in slow-motion.
+  # Video and audio are now in sync.
 [[Category:Internal filters]]
 [[Category:Audio_filters]]