How to make nlecomposition/nleurisource work as expected?

[Thibault Saunier]

Hello Guofeng,

gst-launch will not be able to use the NleComposition, mostly because
the composition is responsible for building the pipeline, linking
element together etc... but Gst pipeline parser also tried to do the
same thing, leading to broken behaviour.

You might want to have a look at ges-launch, there is some
documentation at
https://phabricator.freedesktop.org/w/gstreamer/gst-editing-services/ges-launch/
but that will be moved to the GES documentation in the near future.

Regards,

Thibault Saunier

On Wed, Oct 14, 2015 at 4:45 PM, Guofeng Zhang <guofeng.zhang at mybean.cn> wrote:
> Hi,
>
> I tried to use gnonlin to play part of the audio file (start at 5s in the
> audio file and the duration is 5s), so I use the following command:
>
> gst-launch-1.0 nlecomposition \( nleurisource uri=file://$PWD/ten.ogg
> start=0 duration=5000000000 inpoint=5000000000 \) ! audioconvert ! alsasink
>
> I got the following output, which had the error messages listed:
>
> Setting pipeline to PAUSED ...
> Pipeline is PREROLLING ...
> (gst-launch-1.0:4619): GStreamer-CRITICAL **: gst_pad_push_event: assertion
> 'GST_IS_PAD (pad)' failed
> (gst-launch-1.0:4619): GStreamer-CRITICAL **: gst_object_unref: assertion
> 'object != NULL' failed
> Pipeline is PREROLLED ...
> Setting pipeline to PLAYING ...
> New clock: GstAudioSinkClock
> Got EOS from element "pipeline0".
> Execution ended after 0:00:16.289522903
> Setting pipeline to PAUSED ...
> Setting pipeline to READY ...
> Setting pipeline to NULL ...
> Freeing pipeline ...
>
> and the audio is played from the begin to the end (16s, not 5s, and not
> start playing at 5s).
>
> I donot know how to fix it. Your help is appreciated.
>
> I use gstreamer 1.6.0 built from the source by myself, ubuntu 15.04.
>
> NOTE:
>
> if I run the following command:
>
>  gst-launch-1.0 uridecodebin uri=file://$PWD/ten.ogg ! audioconvert !
> alsasink
>
> No failed messages output, so I think my environment is fine.
>
> Thanks again.
>
> guofeng
>
>
>
>
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