VideoStream

VideoStream[video]

creates a new VideoStream object from a file or a URL including a livestream video.

VideoStream[video]

creates a VideoStream object from a Video object video.

VideoStream[id]

is an object that represents a unique video stream.

Details and Options

  • VideoStream is a handle to a Video object to programmatically control playback.
  • Use VideoPlay to start playing back the video stream.
  • Use VideoPause and VideoStop to pause or stop the playback or the recording.
  • The following options can be specified:
  • AudioOutputDeviceAutomaticaudio output device to use for playback
    ImageSizeAutomaticdisplay size of the video frames
    LoopingFalsewhether to loop the playback
    RasterSizeAutomaticdimensions of video frames
    SoundVolumeAutomaticsound volume
  • A list of available properties can be obtained using astream["Properties"].
  • It is possible to set values of properties with astream["prop"]=val.
  • Global properties:
  • "Duration"overall duration
    "ID"the stream ID
    "ImageSize"the size at which to display the video
    "Location"location of the linked video file
    "Looping"whether to loop the playback
    "Position"position of the playback given as a time Quantity
    "Status"status of the stream
    "AudioTrackCount"number of audio tracks
    "VideoTrackCount"number of video tracks
    "SubtitleTrackCount"number of subtitle tracks
  • Possible settings for "Status" include "Playing", "Paused" or "Stopped".
  • Current track properties:
  • "CurrentAudioTrack"index of the current audio track
    "CurrentAudio"snippet of the current audio
    "CurrentVideoTrack"index of the current video track
    "CurrentFrame"a frame of the current video
    "CurrentSubtitleTrack"index of the current subtitle track
    "CurrentSubtitle"snippet of the current subtitle
  • Properties for the current audio track:
  • "AudioOutputDevice"audio output device to use for playback
    "AudioChannels"number of audio channels
    "SampleRate"audio sample rate
    "SoundVolume"sound volume
    "AudioEncoding"audio codec
  • Properties for the current video track:
  • "FrameChannels"number of color channels
    "FrameRate"video frame rate
    "RasterSize"dimensions of the frame
    "VideoEncoding"video codec
  • Properties for the current subtitle track:
  • "SubtitleEncoding"subtitle codec

Examples

open allclose all

Basic Examples  (1)

Create a VideoStream object linking to a local video file:

Change the stream position:

Pause the stream:

Scope  (7)

Basic Uses  (4)

A video stream directly from a file:

A stream from a URL:

A stream from a livestream video:

Duration and position of livestreams are always Indeterminate:

A video stream from a Video object:

Properties  (3)

Check for available stream properties:

Get the property values of a video stream:

Set the "Position" property:

Extract frame at current position:

Modify properties while playing a stream:

Options  (3)

ImageSize  (1)

By default, automatic image size is used, which scales depending on image dimensions and window size:

Specify a different image size:

Notice that image dimensions are not affected:

Change the "ImageSize" property:

Looping  (1)

By default, the video stream is not looping:

Create a looping stream:

Create a stream that loops twice:

RasterSize  (1)

By default, the original raster size is used:

Specify a different raster size:

Specify both width and height:

Applications  (3)

Build a simple video GUI:

Apply a neural network–based function to the current frame in real time:

Highlight the results of ImageCases dynamically:

Apply an image processing function dynamically to the current frame:

Compute the result of ImageSaliencyFilter:

Wolfram Research (2020), VideoStream, Wolfram Language function, https://reference.wolfram.com/language/ref/VideoStream.html.

Text

Wolfram Research (2020), VideoStream, Wolfram Language function, https://reference.wolfram.com/language/ref/VideoStream.html.

BibTeX

@misc{reference.wolfram_2020_videostream, author="Wolfram Research", title="{VideoStream}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/VideoStream.html}", note=[Accessed: 18-April-2021 ]}

BibLaTeX

@online{reference.wolfram_2020_videostream, organization={Wolfram Research}, title={VideoStream}, year={2020}, url={https://reference.wolfram.com/language/ref/VideoStream.html}, note=[Accessed: 18-April-2021 ]}

CMS

Wolfram Language. 2020. "VideoStream." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/VideoStream.html.

APA

Wolfram Language. (2020). VideoStream. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/VideoStream.html