Phonon and video for linux (v4l)

[Matthias Kretz]

Hi Detlev,

from what I know it should be possible to support v4l in a gstreamer or NMM 
based backend without adding code that directly accesses the v4l device(s).

There are the xine and avkode backends which could make use of such an 
addition though as neither xine nor ffmpeg provide means to work with v4l.

Implementing v4l in its own backend would result in a backend that can only be 
used for v4l and nothing else, i.e. no audio/video playback would work.

Coming back to the backend idea: I think you understood that Phonon can make 
use of multiple backends at the same time, right? This is not the case. One 
application can only use one backend at a time and as such every backend 
should be as full featured as possible.

From the little I know about v4l I'd say start with v4l2 and when that's done 
you can still take a look into v4l1.

What features were you thinking of implementing? I'd start with displaying the 
v4l video stream in a VideoWidget (Xv/XShm/OpenGL/whatever) and then look 
into implementing VideoDataOutput (which needs some API love first, though).

On Wednesday 04 October 2006 12:17, Detlev Casanova wrote:
> I'm going to make a backend for Phonon to support webcam streaming.
> I won't begin before next week but I have some questions to ask.
>
> - I think that implementing 2 different backends for v4l1 and v4l2 would be
> better than one for both.
>
> - In addition, shall we forget v4l1 and put the priority on v4l2 ?
>
> - I thought to make a backend by webcam driver but I don't really see the
> utility as all webcams work near the same way.
>
> If you think I'm wrong on any point, just let me know :)

-- 
C'ya
        Matthias
________________________________________________________
Matthias Kretz (Germany)                            <><
http://Vir.homelinux.org/
MatthiasKretz at gmx.net, kretz at kde.org,
Matthias.Kretz at urz.uni-heidelberg.de
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