Re: bttv driver problem last kernels

[Linos <info@linos.es>]

Daniel Glöckner escribió:
> On Fri, Jun 06, 2008 at 01:34:17PM +0200, Linos wrote:
>> Hello all,
>> 	i am using a bttv multicapture board and i have been having 
>> 	increasing problems in last kernels, i am using two programs to capture my 
>> video input for security reasons (helix producer and mp4live from mpeg4ip 
>> project) since the first versions of v4l2 in 2.4 patched kernel versions i 
>> can attach the two programs at the same time at the same video input, only 
>> loss framerate
> 
> You are relying on undocumented behaviour when two v4l1 applications are
> reading from bttv at the same time. Furthermore the v4l2 standards says
> 
> "1.1.4. Shared Data Streams
> 
> V4L2 drivers should not support multiple applications reading or writing
> the same data stream on a device by copying buffers, time multiplexing
> or similar means. This is better handled by a proxy application in user
> space. When the driver supports stream sharing anyway it must be
> implemented transparently. The V4L2 API does not specify how conflicts
> are solved."
> 
> You should change your setup to use only one application accessing the
> device.
> 
>   Daniel
> 

I have two options here:

1) maintain 2.6.20 kernel version
2) search for an application proxy that lets me use the same input for two programs

i have a windows client connecting the two streams in different options, i cant disable any of them and i cant 
double the number of capture inputs in the system, anyway i have not read the v4l2 standard so you have reason 
that i should not be doing that but i have been doing from 2.4.17 (with patches) to 2.6.20.

Regards,
Miguel Angel.

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