VideoGenerator

VideoGenerator[imagespec]

generates a video with frames generated from imagespec.

VideoGenerator[<|"Image"imagespec,"Audio"audiospec|>]

returns a video with audio data generated from audioexpr.

VideoGenerator[…,dur]

generates a video of duration dur.

Details and Options

VideoGenerator can be used to generate video objects algorithmically. It is typically used for creating video of a time-varying plot, a rotating 3D object, etc.
The imagespec can be any of the following:

	image	uses image in the first track
	{image₁,image₂,…}	uses the sequence of image_i in the first track
	manipulate	a Manipulate or an AnimatedImage animation
	imagefunc	a function imagefunc of time that creates one or multiple images

The audiospec can be any of the following:

	audio	uses audio in the first track
	{audio₁,audio₂,…}	uses the sequence of audio_i in the first track
	audiofunc	a function audiofunc of time that creates a list or matrix of audio samples

The duration specification dur can be any of the following:
dur time given in seconds

Quantity[dur,"Seconds"] time given in seconds or any compatible unit

Quantity[n,"Frames"] time given as a number of frames
To generate frames in parallel, use Parallelize[VideoGenerator[…]]. »
The following options are supported:

AudioEncoding	Automatic	audio encoding to use
BitRate	Automatic	approximate bit rate to use
CompressionLevel	Automatic	compression level to use
FrameRate	30	the frame rate to use
GeneratedAssetFormat	Automatic	the file format of the result
GeneratedAssetLocation	$GeneratedAssetLocation	the location of the result
OverwriteTarget	False	whether to overwrite an existing file
RasterSize	Automatic	the raster size used to rasterize expressions
SampleRate	Automatic	the audio sample rate to use
VideoEncoding	Automatic	video encoding to use

Examples

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Basic Examples (2)

Generate a video of a varying plot:

Generate video from rotating 3D graphics:

Scope (8)

Video from Images (3)

Create a two-second-long video from a single image:

Specify the number of frames to generate:

Verify the number of frames in the result:

Create a video from a list of images:

Show time series of frame color values:

Video from a Function (3)

Create a video from a rotating image:

Use a function that takes the time as input and rasterizes it to an image:

Use a function to generate two video tracks:

The function generates blurred frames in the first track with increasing radius:

The function generates quantized images with increasing colors in the second track:

Video with Audio (2)

Create a video with an audio track:

Use functions to generate both the video and audio tracks:

The image function takes the time as input and rasterizes it to an Image:

The audio function takes the time as input and uses it to control the frequency of a triangle wave:

Options (10)

AudioEncoding (1)

Use the AudioEncoding option to specify the audio encoding to be used:

CompressionLevel (1)

Use the CompressionLevel option to control the file size of the result:

Compare file sizes and the last frame quality for different compression levels:

FrameRate (1)

The default frame rate is 30 frames per second:

Specify the frame rate to use:

GeneratedAssetLocation (2)

Assets are automatically generated in the "Video" folder within $WolframDocumentsDirectory:

Specify the location of the asset created by VideoGenerator:

Use a LocalObject as the asset for the resulting Video object:

OverwriteTarget (1)

By default, if a file already exists it is not overwritten:

Overwrite an existing file by specifying OverwriteTargetTrue:

RasterSize (1)

By default, if the video tracks specification produces a Graphics object, the result is rasterized:

Use the RasterSize option to control the rasterization:

If the video tracks specification produces an Image, specifying the RasterSize option will resize the result:

SampleRate (2)

By default, if the audio tracks specification is an Audio object, the sample rate will be preserved:

Use the SampleRate option to resample the audio input:

If the audio tracks specification is a function, the default sample is Hz:

Use the SampleRate option to control the sample rate of the result:

VideoEncoding (1)

Use the VideoEncoding option to specify the video encoding to be used:

Applications (6)

Create a video by adding a still image to an audio signal:

Generate a video of rotating 3D graphics:

Generate a video by moving the viewpoint around a 3D object:

Visualize the viewpoint trajectory:

Generate the Video:

Create a Video object displaying the evolution of a cellular automaton:

Create a Video object displaying a ball bouncing down steps.

First, solve the differential equation governing the motion of the ball:

Precompute a "staircase" background:

Display the evolution of the ball's position over the staircase:

Create a video showing the travel directions from Champaign to Chicago:

Extract the points forming the path:

Create the video:

Properties & Relations (3)

Parallelize an expensive frame generation to speed up the computation:

Use Animate to create an animation in a notebook:

VideoGenerator can achieve the same results but without displaying any controls:

The result is also more easily shareable outside a notebook, since it creates a video file.

Separately generated video and audio objects can be combined using VideoCombine.

Generate a video with no audio:

Generate an audio sample:

Combine the two using VideoCombine:

Possible Issues (1)