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SowVideo[frame]

specifies that frame should be collected by the nearest enclosing ReapVideo.

SowVideo[frame,n]

repeats frame n times when reaped.

Details
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SowVideo

SowVideo[frame]

specifies that frame should be collected by the nearest enclosing ReapVideo.

SowVideo[frame,n]

repeats frame n times when reaped.

Details

  • SowVideo can be used to specify interesting video frames to be "reaped" from an iterative expression evaluation.
  • SowVideo[frame,…] returns frame, which can be a single image or graphics, or a list of them.
  • In SowVideo[frame,n], n can be given as a scalar specifying the number of frames or a time Quantity object.
  • In SowVideo[frame,n], if frame is a list, it gets resampled to n frames.

Examples

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Basic Examples  (2)

Evaluate a sequence of expressions, "reaping" into a video the ones that have been "sown":

Wolfram Language code: ReapVideo[SowVideo[[image]];[image];SowVideo[[image]]]//IconizedObject[«frames»]

Sow video frames into a video using Table:

Wolfram Language code: ReapVideo[Table[SowVideo@ColorQuantize[[image], q], {q, 10, 2, -1}];, FrameRate -> 6]

Scope  (4)

Sow an image once:

Wolfram Language code: ReapVideo[SowVideo[[image]]]//IconizedObject[«frames»]

Sow an image 5 times:

Wolfram Language code: ReapVideo[SowVideo[[image], 5]]//IconizedObject[«frames»]

Sow an image for 1 second:

Wolfram Language code: ReapVideo[SowVideo[[image], Quantity[1, "Seconds"]]]//IconizedObject[«frames»]

Sow some Graphics objects:

Wolfram Language code: ReapVideo[Table[{SowVideo[Graphics[{Hue[h], Disk[]}]]}, {h, 0, 1, .01}]]

Sow some colors and generate constant frames of that color:

Wolfram Language code: ReapVideo[Table[SowVideo@Hue[h], {h, 0, 1, .05}]]

Sow a mix of different objects:

Wolfram Language code: ReapVideo[ Table[SowVideo@RandomImage[], 20]; Table[SowVideo@Hue[h], {h, 0, 1, .05}]; Table[SowVideo@Graphics[{Hue[h], Disk[]}, ImageSize -> 75], {h, 0, 1, .05}] ]

Applications  (2)

Perform a nested pruning until no more pruning is done, then reap all frames into a video:

Wolfram Language code: ReapVideo[NestWhileList[SowVideo@Pruning[#, {1}]&, Thinning[[image]], Unequal, 2]]

Sow frames of the video where at least one face is detected:

Wolfram Language code: video = ResourceData["Sample Video: Practicing Yoga"];
Wolfram Language code: ReapVideo[VideoMapList[If[Length[FindFaces[#Image]] > 0, SowVideo[#Image]]&, video];]
Wolfram Research (2024), SowVideo, Wolfram Language function, https://reference.wolfram.com/language/ref/SowVideo.html.

Text

Wolfram Research (2024), SowVideo, Wolfram Language function, https://reference.wolfram.com/language/ref/SowVideo.html.

CMS

Wolfram Language. 2024. "SowVideo." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/SowVideo.html.

APA

Wolfram Language. (2024). SowVideo. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/SowVideo.html

BibTeX

@misc{reference.wolfram_2026_sowvideo, author="Wolfram Research", title="{SowVideo}", year="2024", howpublished="\url{https://reference.wolfram.com/language/ref/SowVideo.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_sowvideo, organization={Wolfram Research}, title={SowVideo}, year={2024}, url={https://reference.wolfram.com/language/ref/SowVideo.html}, note=[Accessed: 13-June-2026]}