[linux-dvb] V4L vs DVB [bcc][faked-from][heur][spam-bayes]

Manu Abraham abraham.manu at gmail.com
Thu Sep 21 12:11:52 CEST 2006


Mark Howells wrote:
> Hi Steve 
> 
>> -----Original Message-----
>> From: Steven Toth [mailto:stoth at hauppauge.com] 
>> Sent: 20 September 2006 13:26
>> Subject: Re: [linux-dvb] V4L vs DVB 
>>
>> Last I checked, VDR did not use V4L, it's a DVB (and maybe 
>> ATSC) DVR application.
> 
> Maybe so - I haven't really checked yet. I'm still learning about this stuff....
> 
>> "Assuming a decent tuner lock", your basic assumption is true 
>> but the subject runs much deeper than that.
> 
> Always, but at last my basic understanding appears to be correct. Can a V4L device provide MPEG streams like a DVB device? How does it provide EPG type info?
> 


Couple of differences.

EPG, as regards to DVB is extracted from the Service Information (MPEG2
SI) V4L doesn't use any MPEG SI

DVB uses the dvr (/dev/dvb/adapterX/dvrY) device for a MPEG stream.
V4L uses /dev/v4l/videoX or /dev/videoX

Basically, V4L is used for analog stuff.


Manu



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