Improve USB Live view (live video over USB2) - Feature Requests - CHDK Forum
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Improve USB Live view (live video over USB2)

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Offline Stimpy

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Improve USB Live view (live video over USB2)
« on: 18 / October / 2008, 19:57:20 »
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With applications such as extrawebcam, extrawebcam.com - turn your Canon digital camera into webcam for video conferencing and more, it's possible to stream live video from a Canon Powershot to a PC.

Currently there are two limitations that I believe the CHDK could overcome,

1. Increase the resolution from 320x240 up to 640x480, (almost all new Powershots support this mode).
2. Reduce the Jpeg compression level. It's very high at the moment - you can see Jpeg ringing artifacts around high contrast areas.

USB2 can handle 480mbps, (which is roughly 60 MB/sec), so in theory we could send uncompressed video over USB2 and record this stream to an AVI file on a laptop.




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Offline whim

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Re: Improve USB Live view (live video over USB2)
« Reply #1 on: 19 / October / 2008, 04:49:50 »
Quote
...which is roughly 60 MB/sec...

i've never heard any reliable report of people getting more than 30-35 Mb/s with USB2 in a real world application

wim
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Offline Stimpy

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Re: Improve USB Live view (live video over USB2)
« Reply #2 on: 19 / October / 2008, 07:02:27 »
Uncompressed 640x480 video would be well under 30mb/sec, so it would still work.



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Offline dzsemx

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Re: Improve USB Live view (live video over USB2)
« Reply #3 on: 19 / October / 2008, 07:16:51 »
usb communication related functions aren't found yet

« Last Edit: 19 / October / 2008, 07:35:50 by dzsemx »
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Offline chr

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Re: Improve USB Live view (live video over USB2)
« Reply #4 on: 19 / October / 2008, 15:55:52 »
Another job for usb-snoop *g*

However, the list of supported cams is short and mine is not listed. bastards!

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