How to make nlecomposition/nleurisource work as expected?

[Guofeng Zhang]

I am confused.

If NleComposition has only one src pad, and if the the file contains the 
video and audio streams, how could I link the video and audio to the 
other elements?

Thanks very much.

Guofeng


On 2015/10/15 16:45, Thibault Saunier wrote:
> 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
>>>>
>>>>
>>>>
>>>>
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>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
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