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Author Topic: Four Level Grayscale Video -  (Read 7330 times) Bookmark and Share
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thepenguin77
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« on: 29 January, 2011, 06:46:25 »
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Yes, that title means exactly what you think it does. I can play 4 level grayscale videos. The videos run at 15 fps and are 12*64*2 = 1,536 bytes a frame. But through some RLE (compressing 00's and FF's) I managed to get compression ratios of about 30% meaning that overall, these videos run at about 16KB/s.

As far as the converting, it is very ugly. First I send a video through SUPER and it spits it out as a series of .jpg's. Then I use a GIMP extension to convert those to .bmp's. Then my converter looks at each picture, decides which colors go where, and spits out a binary which goes through To8xk and Wabbitsign to become an app.

To decide what color to use where, I tried two different strategies. The first was to tally up all the brightnesses of every pixel in the whole video then take the Q1, Mid, and Q3 as the cutoffs for each color. But this resulted in parts of the video that were mostly one color. So used the same technique to calculate the cutoffs each frame and that is what I use now. (But the old way is still possible with the flip of a bit.)

There'll be more videos to come. Even one sync'd with another calculator for sound (bet you can't guess what that is Wink). But for now, you just get to watch me do a Daffy off a jump while skiing.

Edit:
     It looks better in wabbitEmu, so here are the files. (I can't even imagine on a real calc 0.0

Edit2:
     I got too anxious and uploaded an uncompressed video and a decompressing player. Fixed now.

* fourVidDemo.gif (116.82 KB, 192x128 - viewed 508 times.)
* fourvid.8xp (0.42 KB - downloaded 69 times.)
* File z.8xk (160.26 KB - downloaded 76 times.)
« Last Edit: 29 January, 2011, 07:02:24 by thepenguin77 » Logged
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« Reply #1 on: 29 January, 2011, 06:51:47 »
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THAT'S AWESOME! (pardon my caps)

Wow. shocked  Wonderful job.  How much video can we fit on the calc at once?
Also, nice jump. Grin
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« Reply #2 on: 29 January, 2011, 06:56:17 »
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It obviously depends on the video. But if you get around 30% compression, around 90 seconds. Meaning that it holds more video than sound.

I forgot to mention in the first post, don't garbage collect with this on your calculator. Some of the pages start with FF and the app will surely get corrupted.
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« Reply #3 on: 29 January, 2011, 06:56:49 »
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How does it work? Wabbitemu won't run it for me  Cry
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« Reply #4 on: 29 January, 2011, 06:57:41 »
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Send the app and the program and run the program. That's so it's easier to modify while working on it.
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You can build a statue out of either 1'x1' blocks or 12'x12' blocks. The 1'x1' blocks will take a lot longer, but the final product is worth it.
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« Reply #5 on: 29 January, 2011, 06:59:27 »
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Well, there goes Wabbit...
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« Reply #6 on: 29 January, 2011, 07:03:01 »
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I got too anxious. Read the Edit2 on the first post. That will probably fix your problems.
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You can build a statue out of either 1'x1' blocks or 12'x12' blocks. The 1'x1' blocks will take a lot longer, but the final product is worth it.
       -Runer112
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« Reply #7 on: 29 January, 2011, 10:15:47 »
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That's awesome! I wonder if this could be streamed from MSD8x...
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« Reply #8 on: 29 January, 2011, 10:24:26 »
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Wow, now that is a cool idea!
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FileSyst is an application that provides a folder and filesystem for the TI-83+/84+ calculators. It is designed to be easy to access and use in BASIC, and it can be used to access game files and save data, or to create a command prompt, among other things:

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« Reply #9 on: 29 January, 2011, 10:31:23 »
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That's even more amazing than the first time I ran truegray.  shocked
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« Reply #10 on: 29 January, 2011, 10:53:05 »
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Amesome screenshoot !
(a video player on z80, soon ?)


I download the 2 files, and I got a bug :



PS : Which langage is use ?
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« Reply #11 on: 29 January, 2011, 11:02:35 »
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Wow, your screenshot looks like a video converted from a VHS tape during two overlapping recordings. Tongue

He uses assembly, by the way.
« Last Edit: 29 January, 2011, 11:02:58 by DJ Omnimaga » Logged
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« Reply #12 on: 29 January, 2011, 16:44:20 »
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Could you make a program that does the same thing, but for black and white screens?
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Ashbad
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« Reply #13 on: 29 January, 2011, 18:51:31 »
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I would totally do this for the sausage song
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« Reply #14 on: 29 January, 2011, 21:02:11 »
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I'm surprised no one thought of rickrolls yet Tongue
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