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 :)
cChannel *gChan = Channels.GetByNumber(ChanNum); cDevice *gDev = cDevice::GetDevice(gChan, 0, 1); gDev->SwitchChannel(gChan, 1); if (gDev->HasLock(5000) && gDev->HasProgramme()) Image = gDev->GrabImage(ImageSize, Jpeg, Quality, SizeX, SizeY);
the problems with this approach are:
the primary device changes, even if the transponder is the same
the grabbed image is black, because the data is not available when the actual grab happens
any suggestions how to do that properly?
TIA, Herbert
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
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Herbert Poetzl -
Matthias Schwarzott