SowVideo

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`SowVideo`

New in 14.1[Experimental]

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SowVideo[frame]

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

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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)Summary of the most common use cases

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

In[21]:=21

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https://wolfram.com/xid/09a8yvg8e-izix37

Out[21]=21

Sow video frames into a video using Table:

In[1]:=1

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https://wolfram.com/xid/09a8yvg8e-tfqgky

Out[1]=1

Scope (4)Survey of the scope of standard use cases

Sow an image once:

In[1]:=1

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https://wolfram.com/xid/09a8yvg8e-05wa0r

Out[1]=1

Sow an image 5 times:

In[2]:=2

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https://wolfram.com/xid/09a8yvg8e-i5r06j

Out[2]=2

Sow an image for 1 second:

In[3]:=3

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https://wolfram.com/xid/09a8yvg8e-bqy6r0

Out[3]=3

Sow some Graphics objects:

In[1]:=1

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https://wolfram.com/xid/09a8yvg8e-db3z7k

Out[1]=1

Sow some colors and generate constant frames of that color:

In[1]:=1

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https://wolfram.com/xid/09a8yvg8e-6etvy

Out[1]=1

Sow a mix of different objects:

In[1]:=1

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https://wolfram.com/xid/09a8yvg8e-81dri6

Out[1]=1

Applications (2)Sample problems that can be solved with this function

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

In[2]:=2

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https://wolfram.com/xid/09a8yvg8e-efyq9e

Out[2]=2

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

In[1]:=1

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https://wolfram.com/xid/09a8yvg8e-397t87

In[2]:=2

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https://wolfram.com/xid/09a8yvg8e-nbhd23

Out[2]=2

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