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Groups > comp.os.linux.misc > #7710
| From | J G Miller <miller@yoyo.ORG> |
|---|---|
| Newsgroups | comp.os.linux.misc |
| Subject | Re: assigning specific /dev/videoN to specific USB webcams |
| Date | 2013-03-31 19:33 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <kja32b$olk$1@dont-email.me> (permalink) |
| References | <ki552n$nat$1@dont-email.me> <kinsh3$2ua$2@dont-email.me> <kio081$ui1$2@dont-email.me> <kj9ui3$7pp$1@dont-email.me> |
On Sunday, March 31st, 2013, at 18:16:36h +0000, Kevin Snodgrass wrote: > ok, but WHY does V4L assign analog devices /dev/videoX and digital /dev/ > dvb/adapterX ? As I tried to explain/second guess, back in the days of the analog devices, the developers only recognized one "capability/feature" on the card and so that was /dev/videoN. For digital cards, these have more than one "capability/feature" and so require a directory to keep the device interface files together. It is similar to the way there was a change for audio in device interface files in going from OSS to ALSA. Under OSS, an audio card has /dev/dspN and /dev/mixerN and maybe /dev/sequencerN. Now under ALSA, everything is kept together under /dev/snd. They should have used a similar scheme to v4l2 of /dev/snd/card0, /dev/snd/card1 as for DVB cards, but as you so correctly observed there is a more or less a total lack of consist*e*ncy between different kernel modules, and I suppose, ultimately the blame for that can be laid at the foot of Linus Torvalds, who will probably respond that he could care less about such issues. There seems to be a general attitude of "so long as it works" (sort of anyways), that is good enough, so stop asking awkward questions. Maybe they do things more logically and consistently in BSD with their benevolent dictatorship style of management, rather than the Linux laissez-faire approach? Anyways I am still awaiting (probably in vain) for some help with udev rules, since obviously this is the wrong group in which to post such a technical question.
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assigning specific /dev/videoN to specific USB webcams J G Miller <miller@yoyo.ORG> - 2013-03-17 19:20 +0000
Re: assigning specific /dev/videoN to specific USB webcams Robert Heller <heller@deepsoft.com> - 2013-03-17 14:46 -0500
Re: assigning specific /dev/videoN to specific USB webcams J G Miller <miller@yoyo.ORG> - 2013-03-17 20:04 +0000
Re: assigning specific /dev/videoN to specific USB webcams Kevin Snodgrass <kdsnodgrass@yahoo.com> - 2013-03-24 21:51 +0000
Re: assigning specific /dev/videoN to specific USB webcams J G Miller <miller@yoyo.ORG> - 2013-03-24 22:54 +0000
Re: assigning specific /dev/videoN to specific USB webcams Robert Heller <heller@deepsoft.com> - 2013-03-24 18:27 -0500
Re: assigning specific /dev/videoN to specific USB webcams J G Miller <miller@yoyo.ORG> - 2013-03-25 02:34 +0000
Re: assigning specific /dev/videoN to specific USB webcams Kevin Snodgrass <kdsnodgrass@yahoo.com> - 2013-03-31 18:16 +0000
Re: assigning specific /dev/videoN to specific USB webcams J G Miller <miller@yoyo.ORG> - 2013-03-31 19:33 +0000
Re: assigning specific /dev/videoN to specific USB webcams Kevin Snodgrass <kdsnodgrass@yahoo.com> - 2013-04-11 14:19 +0000
Re: assigning specific /dev/videoN to specific USB webcams J G Miller <miller@yoyo.ORG> - 2013-04-11 15:21 +0000
Re: assigning specific /dev/videoN to specific USB webcams Eric Pozharski <whynot@pozharski.name> - 2013-04-01 13:52 +0300
Re: assigning specific /dev/videoN to specific USB webcams J G Miller <miller@yoyo.ORG> - 2013-04-01 18:24 +0000
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