[GEM-dev] multiple video input streams became very slow after update

[Harrie Hoogeveen]

Hello again,

I come to ask for help again, because I am getting desperate.
I tried so many things, al version from 0.92.2 and up, and SVN build. I have
tried compiling these with only gmerlin or quicktime or mpeg but all are not
streaming 2 v4l devices at the same time. With or without sse2 or mmx does
not seem to matter.
It is a simple construction of two pix_video -> texture -> 3Dobject. And
they seem not to be able to stream at the same time.
I am sure it is not the streams, cause I can run more then 3 streams and
play all of them at the same time through the vloopback device with xawtv.
Only within pure data they seem to switch on each other. Like a semaphore,
just one at the time plays the others freeze.
All opengl, glew and direct rendering is there and working.
And it should be working for sure: http://vimeo.com/20685278
What can I be doing wrong?
Has anyone a suggestion in which corner to look or how to trace the problem?

I know I should hit my self in the head for not making a backup of my
working binary's and will next time.

Regards,
Harrie


On Wed, Sep 14, 2011 at 12:59 PM, Harrie Hoogeveen <
harrie.hoogeveen at gmail.com> wrote:

> Hello,
>
> I work with a patch where I read 3 video streams from v4l devices, created
> with the vloopback kernel module.
> These 3 streams are mapped on 3D objects wich I contol using midi.
> After updating to the latest Gem release this became very slow. They seem
> to play only one stream at the time.
> So fist object 1 plays for a sec or two, than stops and then object 2
> starts playing for a sec or two, stops, an then object 3 and back to 1
> again.
> I tested with only one stream, this works fine, but as soon as I open 2,
> they start to switch in playtime again.
> I tried down grading to 0.92.3, which was the stable when I designed this
> patch, but the result is the same.
> If I test the v4l stream with for example VLC the stream runs smooth.
>
> I run pdextended 0.42.5 on a linux system with kernel 2.8.37 (after that
> vloopback is not supported anymore, cause it needs the v4l compat. support
> kernel option.)
> The video streams are generated with LiVES 1.4.4. It supports the vlooback
> output options. It is a UYV clamped stream, 280 pix wide:
>
> *** Using vloopback plugin for fs playback, agreed to use palette type 519 ( UYVY:Y'CbCr (clamped) ).
>
> I run this patch on intel with 6 cores and nvida card.
>
> What could be the cause that just one stream at the time plays in GEM?
>
> Regards,
> Harrie
>
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