On Mittwoch, 11. Juni 2008, Herbert Poetzl wrote:
Greetings!
I would like to 'improve' (or simply extend) the SVDRP Grab command to allow for grabbing a picture from a given channel, if possible, without disturbing normal operations
basic idea:
get a device which is capable of tuning the specified channel (optionally shared transponder)
tune to the channel/stream, and wait until data is available (or some timeout has been reached)
grab a screenshot (similar to current grab)
now, what I tried so far is the following (with little success :)
As far as I know, the grab command does grab of the primary device. For a ff card this is done by accessing /dev/video. For what you want you need a different approach - you need to receive some data and run a software mpeg2 decoder over it - then you get a picture without disturbing current operation.
Matthias