VideoTrim

VideoTrim[video,t]

returns the first t seconds of video.

VideoTrim[video,-t]

returns the last t seconds of video.

VideoTrim[video,{t1,t2}]

returns video starting at time t1 and ending at time t2 of video.

VideoTrim[video,{{t11,t12},}]

returns a list of video objects for all given intervals {ti1,ti2}.

Details and Options

Examples

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Basic Examples  (1)

Trim the first 10 seconds from a video:

Trim from second 10 to second 20 of the video:

Scope  (7)

Trim the first 10 seconds of a video:

Trim the last 10 seconds:

Trim from second 10 to second 20:

Trim using a valid time Quantity:

Compute multiple trims on the same video:

Trim the first and last 10 seconds of a video:

Trim a part of a remote video file:

Note that the trimmed video is stored as a local video object:

Options  (2)

AudioEncoding  (1)

By default, the original audio encoding in the file is preserved if possible:

Specify an audio encoding to use:

CompressionLevel  (1)

Generate a trimmed video using default compression:

Use maximum compression:

The choice of encoders affects the amount by which a file can be compressed:

Applications  (3)

Extract an interesting portion of a video based on audio properties.

Import the audio track and use AudioLocalMeasurements to find the time when the audio has the greatest high-frequency content:

Extract the timestamp of the loudest partition:

Trim 3 seconds on either side of the interval:

Extract an interesting portion of a video based on image properties:

Define a function to detect whether an image has almost constant pixel values:

Use VideoMapTimeSeries to apply the function to each frame and plot the result:

Compute the intervals of constant and non-constant frames:

Find and trim the largest non-constant interval:

Use VideoTrim to partition a video file into smaller segments:

Partition the video into fixed-sized chunks of 20 seconds:

Compute and plot the mean intensity per frame for each video partition:

Perform an analysis of mean intensity value per frame on a specific segment:

Apply edge detection to video frames in a specific segment, generating a new video:

Properties & Relations  (4)

If the requested time is beyond the duration of the video, only the available data is returned:

Negative times are also clipped to 0:

Properties of the original video object are typically preserved:

Compare with the properties of the generated video:

It is not always possible to preserve all properties when changing the encoding:

Some audio encodings support specific sample rates:

Video options such as RasterSize and track selection options are used when creating the trimmed video. Create a video object with nondefault option settings:

Trim a portion of the video:

The trimmed video has the specified raster size:

The trimmed video has only the one selected audio track:

Other options have been propagated:

Possible Issues  (1)

An interval containing equal times is considered empty:

An interval containing equal frames is considered to contain a single frame:

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

Text

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

BibTeX

@misc{reference.wolfram_2021_videotrim, author="Wolfram Research", title="{VideoTrim}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/VideoTrim.html}", note=[Accessed: 21-October-2021 ]}

BibLaTeX

@online{reference.wolfram_2021_videotrim, organization={Wolfram Research}, title={VideoTrim}, year={2020}, url={https://reference.wolfram.com/language/ref/VideoTrim.html}, note=[Accessed: 21-October-2021 ]}

CMS

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

APA

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