gstreamer on Android L: no more amcviddec, PIE problem

[Sebastian Dröge]

On Mi, 2015-05-13 at 21:40 -0700, Gregoire Gentil wrote:
> 
> On 05/13/2015 09:01 AM, Sebastian Dröge wrote:
> > On Mi, 2015-05-13 at 08:36 -0700, Gregoire Gentil wrote:
> >>
> >> On 05/13/2015 12:11 AM, Sebastian Dröge wrote:
> >>> Hi,
> >>>
> >>> On Di, 2015-05-12 at 19:58 -0700, Gregoire Gentil wrote:
> >>>> Hello,
> >>>>
> >>>> I have gstreamer congo 2013.06 for Android working well on Android 4.x.
> >>>> On Android 5.x, it seems that there are (at least) two problems:
> >>>
> >>> Everything on gstreamer.com is outdated and using the old, unsupported
> >>> 0.10 release series of GStreamer. It's also in no way connected to the
> >>> GStreamer project.
> >>>
> >>> You can find new binaries that are known to work well on Android 5.x too
> >>> here: http://gstreamer.freedesktop.org/data/pkg/android/1.4.5/
> >>> And the official website of the GStreamer project here:
> >>> http://gstreamer.freedesktop.org
> >>
> >> Thanks. I will try. A few more questions: Is hardware decode supported?
> >
> > Yes
> >
> >> Is there a tarball with the runtime executable to run gst-inspect on the
> >> device? I don't see them on the page.
> >
> > No, that's not the supported way of using GStreamer on Android. You can
> > get dynamic libraries and gst-inspect if you build things yourself
> > though, but you're on your own then and it's generally more tricky to
> > set up properly than using GStreamer like in the tutorials.
> >
> > Also hardware decoding does not work unless you run GStreamer from a
> > real Android app.
> >
> >> Is there an update of the
> >> excellent old Android Gstreamer tutorials?
> >
> > You can find the tutorials ported to 1.x here:
> > http://cgit.freedesktop.org/~slomo/gst-sdk-tutorials/
> Based on tutorial-3, I have the following pipeline working:
> filesrc location=/sdcard/video.mpg ! tsdemux ! h264parse ! avdec_h264 ! 
> autovideosink
> 
> I would like to decode in hardware. I have added androidmedia but any 
> combination of amcviddec-* doesn't work: plugin not found. What would be 
> the pipeline to decode in hardware? I'm testing on Android 5.0 and 5.1, 
> and on Nexus 5 and Nexus 7 2013.

Try with decodebin, it will automatically select the best available
decoders.

> Also, I have downloaded the runtime 1.4.3 but I get the same PIE error 
> so I can't just run gst-inspect-1.0 to see the list of available plugins...

You can write your own "gst-inspect" based on the GstElementFactory and
GstRegistry API. That way you could list all the available element
factories, and also filter out everything that is not a video decoder.

Even if you were able to run gst-inspect-1.0, you wouldn't see any
hardware decoders there then as they are only available from a real
Android app.

-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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