Gstreamer and Python on the Mac

Mon Jun 22 08:08:25 PDT 2015

2015-06-21 23:11 GMT+02:00 Jack Jansen <Jack.Jansen at cwi.nl>:

>
> On  21-Jun-2015, at 18:33 , Andoni Morales <ylatuya at gmail.com> wrote:
>
>
> El 19/6/2015 11:22 p. m., "Jack Jansen" <Jack.Jansen at cwi.nl> escribió:
> >
> > Andoni,
> > thanks for your note. I had indeed in the mean time found out that
> gobject-introspection is available nowadays, only that it is disabled if
> you do a universal build.
>
> The universal build is a bit tricky to handle due to the design of gobject
> introspection. Anyway the universal builds are no longer maintained, the
> last version of Mac with a 32 bits kernel is Lion and the last Mac with a
> 32 bits arch is from 2006.
>
>
> Hmm, you’re right. But I’m still building all software that I distribute
> universal 32/64, specifically to be able to target 10.7, as there are still
> quite a few pretty capable machines from that era around (Mac Pro, last
> white MacBook, Mac Mini). And actually I have a few sitting here and there
> as semi-turnkey systems:-)
>
> I seem to read in your email that any mods to universal builds to enable
> gobject introspection won’t be accepted into the mainstream. Is that
> correct?
>

You can find my attemp at supporting universal builds of gi here:
https://github.com/ylatuya/cerbero/commit/1802e841bfba84fae63a45dc3a1d97e8ccac49de

My approach consisted in adding a new configuratoin option to
gobject-introspection for configuring where typelibs and gir files are
installed:
  * --with-typelib-suffix=girepository-1.0/$ARCH
  * --with-gir-suffix=gir-1.0/$ARCH

This way each architecture installs on its own subdirectory and at runtime
the same subdirectory is used depending on which arch is loaded.

I don't think there is much intereset in supporting 32bits, compared to the
burden of maintaining it, the OS X system plugins are now using new API's
like the VideoToolBox that wouldn't be available in those macs. You should
ask slomo or _tim in #gstreamer for that.

Andoni

>
> >
> > I’m looking at that, and if I have anything to contribute I’ll do it
> through the bug tracker.
> >
> > Regards,
> > Jack
> >
> >> On  19-Jun-2015, at 17:49 , Andoni Morales <ylatuya at gmail.com> wrote:
> >>
> >> Hi Jack,
> >>
> >> Support for gobject-introspection was merged some time ago in cerbero,
> so you already have everything you need to use GStreamer with python in OS
> X. An example of project using it is pitivi, for which there is a recipe
> too.
> >>
> >> If there is anything missing or something you want to fix/change, file
> bugs in bugzilla for the component "cerbero":
> >>
> >>
> https://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer;component=cerbero
> <https://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer;component=cerbero>
> >>
> >>
> >> Andoni
> >>
> >> 2015-06-18 23:42 GMT+02:00 Jack Jansen <Jack.Jansen at cwi.nl>:
> >>>
> >>> First, a question: is anyone else interested in using GStreamer from
> Python on the Mac?
> >>>
> >>> If not, we can stop here, and I’ll just continue hacking for my own
> benefit:-)
> >>>
> >>> But if other people are interested I have an offer, and a few more
> questions.
> >>>
> >>> What I have is a full OSX framework with gstreamer 1.0, gtk,
> gobject-introspection and everything else you need to use gstreamer from
> Python. I’ve been using this for over two years in various projects, along
> with a couple of friends, and it works just fine. The bad news is that I
> started this 2 years ago based on the gstreamer.com
> <http://gstreamer.com/> fork, and my attempts to feed back these fixes
> into the mainstream went nowhere. This may well be because I wasn’t aware
> of the differences between the gstreamer.com <http://gstreamer.com/> community
> and the gstreamer.freedsktop.org <http://gstreamer.freedsktop.org/> community
> and contacted the wrong people, I don’t know. But anyway: so far my mods
> haven’t seen wide adoption.
> >>>
> >>> So my offer is that I revive the 2 year old stuff and contribute it
> for integration into the current freedesktop.org <http://freedesktop.org/>
>  repository for everybody’s enjoyment.
> >>>
> >>> And this is where the questions come.
> >>>
> >>> - Would this have any chance of being integrated into the main
> repository? Assuming the core team reviews it favourably, etc etc etc…
> >>>
> >>> - Anything I need to be aware of wrt licensing/legal issues? GPL, of
> course, and I can arrange for copyright transfer if that’s wanted, but it’d
> be good to know this in advance (as I am doing this in work time).
> >>>
> >>> - What is the best procedure to start developing? Fork the git, then
> branch, then develop? Something else?
> >>>
> >>> - How do I offer this for review/reintegration when it is done?
> Through the bugzilla? How?
> >>>
> >>> - How should I handle changes to upstream packages? For example, I
> have a mod to the gtk build process that is needed to expose NSViews from
> widgets so they can be used for GStreamer rendering from Python. The
> cerbero recipe for gtk builds from a tarball, should I add a patch, or
> should I build gtk from a forked git repository? Any help on how I feed
> this back to the Btk developers?
> >>>
> >>> - And, actually, same question for changes to gstreamer packages. Fork
> the relevant repository and add a branch?
> >>>
> >>> - Finally, is anyone from the core team willing to enlighten me/hold
> my hand/mentor me, when needed?
> >>>
> >>> Regards,
> >>> --
> >>> Jack Jansen, <Jack.Jansen at cwi.nl>, http://www.cwi.nl/~jack
> <http://www.cwi.nl/~jack>
> >>> If I can't dance I don't want to be part of your revolution -- Emma
> Goldman
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> gstreamer-devel mailing list
> >>> gstreamer-devel at lists.freedesktop.org
> <gstreamer-devel at lists.freedesktop.org>
> >>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> <http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel>
> >>
> >>
> >>
> >>
> >> --
> >> Andoni Morales Alastruey
> >>
> >> LongoMatch:The Digital Coach
> >> http://www.longomatch.ylatuya.es <http://www.longomatch.ylatuya.es/>
> >> _______________________________________________
> >> gstreamer-devel mailing list
> >> gstreamer-devel at lists.freedesktop.org
> <gstreamer-devel at lists.freedesktop.org>
> >> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> <http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel>
> >
> >
> > --Jack Jansen, <Jack.Jansen at cwi.nl>, http://www.cwi.nl/~jackIf
> <http://www.cwi.nl/~jackIf> I can't dance I don't want to be part of your
> revolution -- Emma Goldman
> >
> >
> >
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.freedesktop.org
> <gstreamer-devel at lists.freedesktop.org>
> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> <http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel>
> >
> _______________________________________________
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> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
> --Jack Jansen, <Jack.Jansen at cwi.nl>, http://www.cwi.nl/~jackIf I can't
> dance I don't want to be part of your revolution -- Emma Goldman
>
>
>
> _______________________________________________
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> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>

-- 
Andoni Morales Alastruey

LongoMatch:The Digital Coach
http://www.longomatch.ylatuya.es
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