How to make nlecomposition/nleurisource work as expected?

[Thibault Saunier]

Hello,

I can see that you are connecting to comp::pad-added but
NleComposition now has a always src pad so that will never be called.
I think it is the reason for your error here.

Regards,

Thibault Saunier

On Thu, Oct 15, 2015 at 7:54 AM, Guofeng Zhang <guofeng.zhang at mybean.cn> wrote:
>
> Hi, Thibault,
>
> Thanks for the link, it is very useful. I could play the audio use
> ges-launch.
>
> You said in your mail that gst-launch will not be able to use the
> NleComposition. How about I use NleComposition in the GStreamer application?
>
> I have a C code that use NleComposition. When I run it, I got:
>
> 0:00:00.047100905  4218      0x19f02d0 WARN                 basesrc
> gstbasesrc.c:3481:gst_base_src_start_complete:<source> pad not activated yet
> 0:00:00.050019892  4218      0x19f02d0 WARN                 basesrc
> gstbasesrc.c:3481:gst_base_src_start_complete:<source> pad not activated yet
> 0:00:00.130380971  4218 0x7fad2404f1e0 WARN                oggdemux
> gstoggdemux.c:3293:gst_ogg_demux_do_seek:<'':src_00001227> Locking on ts
> 0:00:00.294603174
> 0:00:00.135908773  4218 0x7fad2404f1e0 WARN                oggdemux
> gstoggdemux.c:4835:gst_ogg_demux_loop:<oggdemux0> error: Internal data
> stream error.
> 0:00:00.136021822  4218 0x7fad2404f1e0 WARN                oggdemux
> gstoggdemux.c:4835:gst_ogg_demux_loop:<oggdemux0> error: stream stopped,
> reason not-linked
> Error: Internal data stream error.
>
> The C code created the following pipleline:
>      nlecomposition ( nleurisource ) ! audioconvert ! alsasink
>
> And the code is here:
> https://github.com/guofengzh/gnonlin-tutorial/blob/master/src/gstGnonlinTutorial.c
>
> Your help is appreciated.
>
> GStreamer/GES 1.6.0, Ubuntu 15.04, gcc 4.9.2
>
> guofeng
>
>
>
> On 2015/10/14 23:55, Thibault Saunier wrote:
>>
>> 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
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> gstreamer-devel at lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>
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