Switching from playbin to uridecodebin (glupload & audio)

[Gottfried Haider]

Thanks Matt!

Regarding the playbin-option: Is it possible to create a "custom video
branch" (GstBin) as part of a textual pipeline description? (that is being
fed to gst_parse_launch)

Or do I need to create a new bin in code, set it up with glupload !
capsfilter ! fakesink (like in testegc [1]), and later
use gst_pipeline_new() and gst_parse_bin_from_description() to create a
custom pipeline that references the video bin created earlier?

Best
G

[1]
https://cgit.freedesktop.org/gstreamer/gst-omx/tree/examples/egl/testegl.c#n1079

On Fri, Sep 16, 2016 at 2:26 PM, Matthew Waters <ystreet00 at gmail.com> wrote:

> On 16/09/16 20:10, Gottfried Haider wrote:
> > Hello all,
> >
> > I have this pipeline as part of Processing's glvideo library, that
> > works great - but doesn't play audio:
> >
> > uridecodebin uri=... ! glupload name=glup ! glcolorconvert !
> > capsfilter name=filter ! fakesink name=vsink
> >
> > So I tried this instead
> >
> > uridecodebin uri=... name=decoder ! queue ! audioconvert !
> > audioresample ! autoaudiosink sync=false decoder. ! queue ! glupload
> > name=glup ! glcolorconvert ! capsfilter name=filter ! fakesink
> > name=vsink sync=false
> >
> > which just hang. (The particular mp4 file I was testing this with had
> > not audio track if that matters.)
> >
> >
> > Should the second pipeline work in theory? Any other things I could
> > try to get something like a playbin-like source element that would
> > also play audio tracks, if the source has one? I uploaded a dot file
> > of the second pipeline on OS X  for you to look at[1].
>
> If the file didn't have an audio track that means that the audio output
> part of the pipeline would not be linked to uridecodebin and thus when
> prerolling would never get a buffer and would never complete the state
> change to paused.  A backtrace of all threads would probably show that
> the audiosink is stuck on the preroll cond/lock.
>
> Your options are to either use playbin with the video-sink property set
> to your custom video branch or if you're set on using uridecodebin, you
> will have to selectively add the audio part of the pipeline if there is
> an audio pad exposed by uridecodebin.  See the following example which
> uses decodebin but the same idea is valid for uridecodebin:
> https://gstreamer.freedesktop.org/data/doc/gstreamer/head/
> manual/html/section-components-decodebin.html.
>
> Cheers
> -Matt
>
> > (If the pipeline looks right it might just be that the audio decoding
> > hits this bug [2] on OS X.)
> >
> >
> > Thanks in advance
> > Gottfried
> >
> >
> > [1] https://bugzilla.gnome.org/show_bug.cgi?id=768630
> > [2] https://sukzessiv.net/~gohai/gstreamer/uridecode-audio.png
> >
>
>
>
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