Re: Gstreamer pipeline problem

[Thomas Senyk <thomas.senyk@pelagicore.com>]

On Friday, 12 July, 2013 17:44:41 Chris Tapp wrote:
> Hi John,
> 
> On 12 Jul 2013, at 15:12, John Weber wrote:
> > Hi Chris,
> > 
> >> That's unfortunate as I need a pipeline which can run on many different
> >> platforms, including 'standard pc'. This was one reason why I was using
> >> fakesink to capture the images - v4l looked like a way to go so that I
> >> could stream the video direct to the screen and get the full benefits of
> >> any acceleration supported by a platform (zero copy, etc.).> 
> > I think you will probably need to build an application that creates a
> > pipeline based on the host.  For example, a desktop system probably will
> > not have much use for V4L output devices, so they might not use v4l2sink
> > but autovideosink. On a i.MX6 for example, you'll want to use
> > mfw_v4lsink, which as I understand it does take advantage of some of the
> > built-in acceleration.
> > 
> > Also, for video decoding (H.264 decompression I mean), you'll want to
> > change the element you use there as well.  For i.MX6 this is vpudec, but
> > for general purpose there is x264dec (think that is the name but not
> > sure).
> Yes, that's one of the reasons I've been using playbin2 and fakesink. I'm
> hoping that playbin will build a decent decode pipeline and I can then use
> the frames in fakesink to create an OpenGLES texture which I can render in
> my app. This also gives a portable way of rendering the video where I want,
> at the size I need and without and decoration.
> 
> I was hoping that glupload may help make this more efficient, but I can't
> even get gst-plugins-gl to build at the moment.

I'm not sure if glupload will help you. 
I tried last week to integrate into Qt and failed.

It heavily depends on the usecase and whether your using X11 or not.
The reason why gst-plugins-gl is applicable for me/QtMultimedia:
https://lists.yoctoproject.org/pipermail/meta-freescale/2013-July/003563.html

Maybe your usecase is different.
Maybe it's good enough for you to render into another framebuffer or you're 
using X11.



> 
> Chris Tapp
> 
> opensource@keylevel.com
> www.keylevel.com
> 
> 
> 
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