Re: a multichannel capture problem

[Ming Liu <mliu@migmasys.com>]

Any comments will be helpful.
I will really appreciate them.

Sincerely yours
Ming

Ming Liu wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">Hello,
>
> As a newbie in V4L2, I am trying to capture two video channels 
> simultaneously (we can live with about 0.05s difference between two 
> channels). Currently, I am using PV-143 (a cheap card with one bt878 
> chip). After some research, I found:
>
> 1. bt878 can only handle one channel at one time, so I will not be 
> able to reach a speed higher than 15 frames/second per channel.
> 2. Since I can not synchronize the two cameras, I will have much lower 
> frame rate if I try to switch between two channels.
>
> My problems are:
>
> 1. Is there any example codes that I can follow to estimate the frame 
> rates using switch channel approach? Can I do this by using standard 
> V4L2 APIs, or I will need to deal with the driver?
> 2. If I choose a multi-chip PCI based video capture card, is there any 
> limit from the bandwidth? Are there any sample codes available?
> 3. In the program point of view, is there difference between using 
> multi-chip card and several single chip cards?
>
> Thank you in advance.
> Sincerely yours
> Ming
>
>
> </div>
>

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