AssumeSampleRate - Revision history

Reel.Deal: add link to avs+ documentation

2022-09-18T03:24:17Z

add link to avs+ documentation

← Older revision		Revision as of 05:24, 18 September 2022
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			<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'')}}

Raffriff42: tweak example

2016-05-18T21:01:39Z

tweak example

← Older revision		Revision as of 23:01, 18 May 2016
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	Changes the sample rate of the current clip without changing the number of samples.		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.		:It will also affect synchronization with the video.

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	'''AssumeSampleRate'''([[Internal_functions#Round\|Round]](dur / (dur+adj) * Ar))		'''AssumeSampleRate'''([[Internal_functions#Round\|Round]](dur / (dur+adj) * Ar))

	# ~~Restore original sample rate while retaining new duration;~~		# Video and audio are now in sync.
	~~# this step is may be skipped if you don't mind a slightly nonstandard sample rate~~.
	~~[[ResampleAudio]](Ar)~~

	# ~~Video and audio are now in sync~~.		# (optional) restore original sample rate.
			#[[ResampleAudio]](Ar)
	</div>		</div>

Raffriff42: tweak example

2016-05-18T13:39:44Z

tweak example

← Older revision		Revision as of 15:39, 18 May 2016
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	[[AviSource]]("video_audio.avi")		[[AviSource]]("video_audio.avi")
	# Let's say that this clip loses audio sync:		# 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:		# Adjust audio duration:

Raffriff42: add example

2016-05-17T21:52:22Z

add example

← Older revision		Revision as of 23:52, 17 May 2016
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	==== Examples ====		==== 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")		[[AviSource]]("video_audio.avi")
			# Let's say that this clip loses audio sync:
			# after 55 minutes the audio is behind by 200 milliseconds.

	# Play video at half speed:		dur = 3300.0 # total duration in seconds (55 minutes x 60)
			adj = -0.200 # correction needed (decrease audio duration by 200 msec)
			Ar = [[Clip_properties\|AudioRate]] # original audio sample rate

			# Adjust audio duration:
			'''AssumeSampleRate'''([[Internal_functions#Round\|Round]](dur / (dur+adj) * Ar))

			# Restore original sample rate while retaining new duration;
			# this step is may be skipped if you don't mind a slightly nonstandard sample rate.
			[[ResampleAudio]](Ar)

			# Video and audio are now in sync.
			</div>

			* Play video and audio at half speed:
			<div {{BoxWidthIndent\|56\|1}} >
			[[AviSource]]("video_audio.avi")

			# Play video at half speed: audio will be out of sync
	[[AssumeFPS]]([[Clip_properties\|FrameRate]]/2)		[[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.		# Video and audio are now in sync.
			# Equivalent to calling [[AssumeFPS]](..., sync_audio=true) (see below)
	</div>		</div>

Raffriff42: formatting, links, phrasing

2016-01-14T11:31:52Z

formatting, links, phrasing

← Older revision		Revision as of 13:31, 14 January 2016
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	{{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.
			:This changes the pitch, playback speed and running time of the audio.
			:It will also affect synchronization with the video.

	~~'''~~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 video at half speed:
			[[AssumeFPS]]([[Clip_properties\|FrameRate]]/2)

	# Play audio at half speed:		# 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.
			</div>

			==== See Also ====
			* [[AssumeFPS]]: {{FuncArg\|''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.

	[[Category:Internal filters]]		[[Category:Internal filters]]
	[[Category:Audio_filters]]		[[Category:Audio_filters]]
			[[Category:Timeline_editing_filters]]

Raffriff42: added category

2015-11-08T15:22:05Z

added category

← Older revision		Revision as of 17:22, 8 November 2015
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	[[Category:Internal filters]]		[[Category:Internal filters]]
			[[Category:Audio_filters]]

Admin: 1 revision

2013-05-09T15:02:25Z

1 revision

← Older revision	Revision as of 17:02, 9 May 2013
(No difference)

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]]