AMV, MTV, DMV?

Video encoding, MTV, DMV, AMV, AMR, fps and everything video-related

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Postby wladston » Wed Dec 14, 2005 4:38 pm

it's kinda this

10 mhz = drains x ma/s
20mhz = drains 4x(or more) ma/h
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You have a e-mail :)

Postby misioslaw » Wed Dec 14, 2005 8:09 pm

i sent you new photos of my s1 mp3 player
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Postby NiteStryker » Thu Dec 29, 2005 8:52 am

hi
let me give the low down

as you know mtv, dmv , amv are all uncompressed files

eg. 16fps for smooth video

so that means
16*time*bit rate*pic size= something large

or something like that

crapper quality= smaller size
good quality=bigger size

main problem with the mp4 system is that its process is unable to process any compressed videos. ie. 20Mhz video on mp4 while 200Mhz on ipod

so if sum1 comes up with some super duper file system, they're lying.

so it could be...
mtv=.png
amv=.jpg
dmv=.bmp

that sort of sums it up
well now that i've gone through 4 mp4s, should i get a decent one?
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Postby wladston » Thu Dec 29, 2005 4:13 pm

Indeed ...

But atj2085 can clock up to 60mhz !
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Postby tr1p1ea » Thu Dec 29, 2005 5:35 pm

[96x64]x16bpp, thats ~12KB per frame.

12KBx16fps = 192KB per second

At that rate it would be ~2MB every 10 seconds, which isnt the case with AMV (this isnt even including audio data).

The files, well at least AMV files are definately compressed.
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Postby Sinclair07_fr » Thu Dec 29, 2005 6:57 pm

The files, well at least AMV files are definately compressed.


A single image from an AMV clip really looks close to a strongly jpg-compressed image ! And if you extract the frames from a short avi or mpg clip, batch-convert them to compressed 96x64 jpg's you'll obtain an average of 3-5 ko/pic.

5x16x60= 4800 ko/min

I compressed the jpg's with Irfan View, using a quality rate of 30, which is the littlest possible without alterating too much the pics.

The point is that AMV files are 2000-2200 ko/min max. So.... I don't know how they are compressed... :?
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Postby tr1p1ea » Fri Dec 30, 2005 4:26 am

I am wondering whether or not the AMV movies used by these players is a rip of the 'Apex Media Video' for GBA. Older info on it can be found here: http://www.apex-designs.net/payback_gba_report6.html

They are claiming some pretty good compression ratios and it is capable of being decoded on GBA. It is possible that our AMV is a rip-off of that codec.
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Postby wladston » Fri Dec 30, 2005 10:55 pm

tr1p1ea,

BRILLIANT!!!

I think it's pretty much the same thing!!!

GBA runs on a z80 processor too, so they must have made a rip of it!!

If the mtv code is GPL.... it would mean that the firmware must be GPL!!!
and we could sue ACTIONS!!! COOOOOOLLLLL!! :)

Shall we report that to James Daniels, who seems to be the responsible for the page?
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Postby leoblues » Mon Feb 06, 2006 9:01 am

I'd like to know, in your opinion, what is the best rate for AMV to have good quality and low space occupation... (in 128x128 mode)
What setting could I use (frames per second, image quality, image focus)?

8)
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Postby wladston » Sat Feb 11, 2006 3:54 am

oh - just to inform - ipods clock, asfik, is 75mhz. S1mp3 max clock is 60mhz.
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mplayer support

Postby xerakko » Sat Feb 25, 2006 12:18 pm

I want to inform that I've talked with a mplayer developer, and it's working to add amv support to mplayer.
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Postby wladston » Wed Mar 01, 2006 5:22 pm

xerakko,

this is great!!

Can you pass me the mplayer developer contact, so I can talk more with him about that ?

There are some programs (amv encoder/decoder) that would help MUCH on this work.

Is he thinking of a amv codec ?? This would be REALLY nice! :)

I would like to say that he can count on all the support that the s1mp3.org community can give.
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Postby dotdotdotz » Fri Jul 28, 2006 4:08 pm

the GBA does not run on a Z80, but rather on an ARM 32-bit CPU core similar to that built into sigmatel chips..... this is why i suspect that this is an original format rather than just a rip of Apex Media Video..... i don't think its that easy to get 32-bit code running on a Z80, that would be like making windows 95 run on your old MSX 8-bit computers....
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Postby Gldaneli » Thu Sep 21, 2006 5:41 pm

AMV is based on algorithm also used in codec known as Cinepak. It's downside is lower compression ratio and slower compression speed, but main advantages is, that decoder is very simple, and very slow CPU s can handle it's decoding. Similar codec is used in MobiClip technology, video player for smartphones.
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Postby Einimas » Fri Feb 16, 2007 9:45 pm

can i convert a movie its like 700 mb size and when i try to convertor crashes
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