A. F. Cano wrote: > Dvbusb2 seems to recognize the device ok. > In fact it seems to create > > /dev/dvb/adapter0/demux0 > /dev/dvb/adapter0/dvr0 > /dev/dvb/adapter0/frontend0 > /dev/dvb/adapter0/net0 > > And I also see /dev/video0 > > But what do those devices represent? Is /dev/video0 the analog tuner? > is /dev/dvb/adapter0/dvr0 the digital tuner? What are the others? > When a driver module loads, the device manager udev will create device nodes on /dev. For dvb devices you get the character devices under /dev/dvb/adapterN (where N = 0 to whatever). The character devices for each adapter N are enumerated in form of M=0 to whatever. For example: /dev/dvb/adapter0/frontend0 .... if the same device had a second frontend, that character device would be enumerated by /dev/dvb/adapter0/frontend1 ... if you had another dvb adapter in the system, then you would see /dev/dvb/adapter1/frontend0 and so forth. * The frontend device controls the tuner and demodulator. * The demux controls the filters for processing the transport stream (TS). * the dvr is a logical device that is associated with the demux character device ... it delivers up the TS for either: (1) immediate playback --- in which case it has to be decoded either: a) on the device itself [its rare for PC devices to have hardware decoding, but not so for STB] or b) downstream by the system [the usual route for PC devices -- i.e. software decoding via the host CPU, and possibly assisted by the GPU) ] or (2) saving to disk for later playback. * the net character device controls IP-over-DVB Similarly, with video capture (or, if you prefer, V4L) devices, you get the /dev/video device node and the videoN character devices. For more info, have a look at the DVB and V4L APIs. > I have been trying to configure mythtv but have no idea what to tell it > about this device. The mythtv docs say that if you have a card with 2 > tuners, define it as a DVB. But, mythtv-setup identifies it correcly > (by name) as an analog card /dev/video0, if I set it up as a DVB it claims > it is a DVICO or Air2PC or... It does not seem to know about the /dev/dvb > devices. Do I need to configure the OnAir Creator as 1 or 2 device > > ... > > I have posted the higher level questions to the mythtv mailing list, but > > no answers yet. Any hints would be welcome. > Sorry, no input on the myth specific questions, though surely someone else might be able to. > Can someone tell me a quick and easy way to test the device? maybe with > mplayer? I have an analog camera connected to the composite input, so > even if I don't get any channels with the rabbit ears and loop antenna, > that should work as a test. See the wiki -- in particular, in the User Section, see the testing your DVB device article. Also see the MPlayer article. _______________________________________________ linux-dvb users mailing list For V4L/DVB development, please use instead linux-media@xxxxxxxxxxxxxxx linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
