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News:

Rockbox Ports are now being developed for various digital audio players!

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Author Topic: Video on nano  (Read 5930 times)

Offline blaxbb

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Re: Video on nano
« Reply #15 on: July 14, 2006, 10:35:02 AM »
Quote from: Llorean on July 02, 2006, 06:22:03 AM
The iPodLinux method is far from ideal though. Since the files end up *incredibly* huge.

http://ipodlinux.org/Mv_player 

they're already working on compressed video and from what I read its already working somewhat well...on the nano
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Offline saratoga

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Re: Video on nano
« Reply #16 on: July 15, 2006, 06:50:00 PM »
Quote from: Xoder on July 14, 2006, 10:19:32 AM
http://en.wikipedia.org/wiki/Composite_video

There's some info about RCA video encoding. The Audio is the same as normal headphones, so you could leave one channel alone.

http://www.maxim-ic.com/appnotes.cfm?appnote_number=734&CMP=WP-4

The above has more specifics about the timings required. This is important because that video signal gets modulated up a lot. Given the horizontal scan frequency (15.734 kHz) of NTSC monitors is just about at the top of the range of human hearing (20 kHz, the max frequency responce of most audio devices' DAC (Digital to Analog Converter), including the iPod's), I'd doubt you can get a very good (if any) picture.

Very neat idea, though. It would require a much faster DAC than is used in audio.

Forget the horizontal scan frequency, theres more to the signal then that.  NTSC requires > 5MHz of bandwidth.  No way thats coming out of a 48KHz DAC.
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Offline Xoder

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Re: Video on nano
« Reply #17 on: July 17, 2006, 03:31:08 PM »
Quote from: blaxbb on July 14, 2006, 10:35:02 AM
Quote from: Llorean on July 02, 2006, 06:22:03 AM
The iPodLinux method is far from ideal though. Since the files end up *incredibly* huge.

http://ipodlinux.org/Mv_player 

they're already working on compressed video and from what I read its already working somewhat well...on the nano

That is INCREDIBLY exciting. Unfortunately the demo video gives a "Bandwidth Exceeded" error...
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