Switching from playbin to uridecodebin (glupload & audio)

[Matthew Waters]

On 16/09/16 22:53, Gottfried Haider wrote:
> 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)

You can create a bin as the video-sink for gst-launch-1.0.  You just
need to enclose the video-sink parameter in double quotes and a bin
should be created with your elements inside.

e.g. gst-launch-1.0 playbin uri=file:///path/to/file
video-sink="glupload ! glcolorconvert ! glfiltercube !
glimagesinkelement" will cubify the video.

Cheers
-Matt

> 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
> <mailto: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
>     <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
>     <https://bugzilla.gnome.org/show_bug.cgi?id=768630>
>     > [2] https://sukzessiv.net/~gohai/gstreamer/uridecode-audio.png
>     <https://sukzessiv.net/%7Egohai/gstreamer/uridecode-audio.png>
>     >
>
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