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Author Topic: Four Level Grayscale Video  (Read 32513 times)

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Offline FloppusMaximus

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Re: Four Level Grayscale Video
« Reply #105 on: March 28, 2011, 11:18:34 pm »
Quote from: DJ_O on March 11, 2011, 03:03:29 am
I always wondered if USB8x works via the TI-Nspire in 84+ mode, but then we're getting a bit off topic. :P
It doesn't.  The Nspire doesn't emulate the 84+'s USB controller - all USB access is done through a set of special opcodes instead.  I don't know enough about these special opcodes to even say whether a port of USB8x would be possible.
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Offline aeTIos

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Re: Four Level Grayscale Video
« Reply #106 on: March 29, 2011, 04:12:11 am »
8 pages late: wow. cool!
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Offline ikemike

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Re: Four Level Grayscale Video
« Reply #107 on: April 05, 2011, 12:03:53 am »
Somewhat off-topic, but what is the longest song trusound can fit on an empty calculator at a decent sound quality?
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Offline willrandship

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Re: Four Level Grayscale Video
« Reply #108 on: April 05, 2011, 12:07:13 am »
Depends on the calc. An 84+SE? I'd guess 3 mins or less. Maybe if you had slower bit sampling it'd be better,
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Offline JosJuice

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Re: Four Level Grayscale Video
« Reply #109 on: April 05, 2011, 12:59:25 pm »
Quote from: willrandship on April 05, 2011, 12:07:13 am
Depends on the calc. An 84+SE? I'd guess 3 mins or less. Maybe if you had slower bit sampling it'd be better,
I think it's around 80-90 seconds, or maybe even less. Lower quality would allow longer sounds, but it sounds pretty bad...
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Offline annoyingcalc

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Re: Four Level Grayscale Video
« Reply #110 on: August 06, 2011, 10:46:44 am »
Quote from: thepenguin77 on February 01, 2011, 12:34:59 pm
It just happened. The first ever true calculator Rick Roll.



Description:
Quote
Using my new program for the 84+, FourVid, I am able to play 4 level grayscale videos on the calculator. Then by combining that with my other program, TruSound, I am able to play videos sync'd with sound!

Obviously this is on an 84+SE. Both the sound and video files are 1.3MB in size, which means that I had to clear the memory on both of them before I started.

Here are the files needed to play it. Just note that the sound file is clocked for wabbitEmu (15MHz) so it will run too fast on a real calculator (16MHz).

Also, if you have sent any of my videos to your real calc. You may have noticed that you are missing some memory. This is because some of the app pages started with $FF and the calculator won't delete them. So the only way to get the memory back is to back up everything on your computer and then clear All Mem. This RickRoll video also suffers from the same problem. Sorry about that. I'll fix that soon.

Haha, the files are too big for this post. Video, player, song.




This never gets old
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Offline thepenguin77

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Re: Four Level Grayscale Video
« Reply #111 on: January 31, 2013, 09:56:22 pm »
Holy necro-update batman!!

So today I wanted to show someone a video on my calculator, but I didn't have any because they are just too big to keep on there all the time. So, since I never actually put this program into a usable state, I figured I'd finish it.

This program now operates exactly like TruVid and even has the same dithering patterns. But, what makes it better than TruVid for videos is that it also compresses them. The compression ratio varies, but anything from 1% to 70% is possible.

Here is the same 1:30 video rendered in all 8 modes:
b
a b
a
1,376,256  (2%)
1,359,872  (3%)
1,064,960  (24%)
1,032,192  (27%)
o
n
ao
an
819,200  (42%)
802,816  (43%)
622,592  (57%)
458,752  (68%)

The first number is the size of the video and the second number is the compression ratio. The flags are:
-   - Use flyod-steinburg dithering
- a - use absolute brightness cutoffs rather than per-frame cutoffs
- b - use both floyd-steinburd dithering and ordered dithering
- n - use no dithering
- o - use ordered dithering


It's interesting that the compression ratios line up rather well with quality. It would appear that to get the best video and still use compression, you should go for the -o flag. -a -n obviously gets the best compression, but it looks terrible. And I'm not sure which is better between (none) and -b, but they both basically have no compression.


In any case, here's everything you need to make your own videos and the -o video: (as well as sources

And this only works on windows because I use DirectShow.
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Offline Sorunome

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Re: Four Level Grayscale Video
« Reply #112 on: January 31, 2013, 10:08:44 pm »
This is awesome!
I actually think that the higher compression rates look better :P
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Offline pimathbrainiac

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Re: Four Level Grayscale Video
« Reply #113 on: January 31, 2013, 10:36:59 pm »
-o and -n look best, imho
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Offline Spenceboy98

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Re: Four Level Grayscale Video
« Reply #114 on: January 31, 2013, 11:13:54 pm »
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Offline pimathbrainiac

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Re: Four Level Grayscale Video
« Reply #115 on: February 01, 2013, 10:06:43 am »
Also, does anyone know of a good conversion software where I can convert with a custom resolution with WMVs.
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Offline thepenguin77

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Re: Four Level Grayscale Video
« Reply #116 on: February 01, 2013, 03:47:54 pm »
Super

It can convert just about anything to anything. Just watch out when installing though because any more they really try to add in a bunch of garbage.
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Offline Spenceboy98

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Re: Four Level Grayscale Video
« Reply #117 on: February 01, 2013, 05:03:18 pm »
I use Freemake to convert my vids.
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Offline Happybobjr

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Re: Four Level Grayscale Video
« Reply #118 on: February 02, 2013, 06:43:56 pm »
This is wonderful :D
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Offline Spenceboy98

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Re: Four Level Grayscale Video
« Reply #119 on: February 06, 2013, 10:55:28 pm »
Converted Gangnam Style:

This is just with -O
« Last Edit: February 06, 2013, 10:56:46 pm by Spenceboy98 »
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