Python and webcam capture delay?
nobody at nowhere.com
Wed Jul 8 13:19:16 EDT 2009
On Tue, 07 Jul 2009 22:11:12 -0700, Tim Roberts wrote:
>>The webcam is bound to do some encoding; most of them use USB "full speed"
>>(12Mbit/sec), which isn't enough for raw 640x480x24bpp at 30fps data.
> That's not true. Most of the web cams made in the last 5 years or so run
> at high speed, 480 Mbps. Full speed only gets you 1 fps at 640x480
> uncompressed, so it's really only useful for the most primitive video
> conference cams.
The very earliest models typically only did 320x200, while later USB-1
webcams used onboard compression to get a decent framerate.
For internet use, 12Mbps isn't that much of an obstacle; the internet
connection's upload speed is more likely to be the limiting factor. Faster
speeds are more useful for things like LAN-based CCTV systems.
More information about the Python-list