[vlc-devel] [PATCH 2/2] add V4L2 video_output module

Rémi Denis-Courmont remi at remlab.net
Tue Jan 17 19:10:29 CET 2012

Le samedi 14 janvier 2012 23:55:39 Francois Cartegnie, vous avez écrit :
> Le 14/01/2012 19:31, Rémi Denis-Courmont a écrit :
> > The point is performance, not result. A single writev() system call is
> > faster than many write() calls, and also faster than many memory copies
> > and one write() call.
> By same result I meant "not working".
> It ends up the same way as doing many writes to the device. I have no
> clue on this.
> The writev() code was correct as I verified it on the yuv output module.

If the driver is buggy, complain to linux-media. Or then, it should be 
documented by V4L2 that writev() is not allowed. But that would be peculiar.

Rémi Denis-Courmont

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