Jitter

A Jitter matrix in which the cells represent colored pixels—such as a video—normally has four planes of 8-bit (char) data, representing the values of the alpha, red, green, and blue components of the color. If you wanted to reduce the bit depth of that color information to fewer than 8 bits, which would reduce the total number of colors in the image, a simple way to do that is to shift all the bits to the right (so that the least significant bits are lost), then shift them back.

One way to superimpose 2D graphics over a video is to draw into a jit.lcd object and then use alpha masking to overlay the jit.lcd contents on top of the video image.

This example uses a 4-plane, 256×256 matrix for easy visualization, but it could be adapted to a 6-plane 1×1024 matrix.

To switch between folders of a slideshow in jitter (explained here) you can set the prefix or folder (i.e. the file path) of the umenu object with the prefix message, then clear and populate it.

To set matrix “B” to have the contents of matrix “A”, you simply send “A” to “B”. (More specifically, you cause matrix “A” to send a jit_matrix message to matrix “B”.) The trick, though, is to suppress thruput on matrix “B” by setting its @thru attribute to 0 (it’s 1 by default), so that you can set and recall its contents independently.

Whenever a movie is read into jit.qt.movie, it sends out a read message that reports whether the movie was read in successfully. You can use that information to trigger a getmoviedim message to jit.qt.movie, and use the moviedim to set the dim of jit.qt.movie and all other objects that need to know that information.

A jit.movie or jit.qt.movie object doesn't automatically provide a notification when it reaches the end of a video. However, it's easy enough to obtain such a notification by checking to see when the video's current time becomes equal to its total duration.

You can switch between multiple videos without starting from the beginning of each clip after each every switch by acquiring the time the clip was stopped as the next starting point. 

You can easily jump to different parts of the movie using the readymade object called playbar. 

For this example to work properly, you will also need to download the small text file subtitles.txt.