decodebin2

[Steffen.Roeber]

Hi
I'm usng a pipeline that contains a filesrc, a decodebin, an appsink and some other elements. What I want to get is the duration of  the current element.
For this I'm using
GstQuery *frameDuration = gst_query_new_duration(GST_FORMAT_DEFAULT);
gst_element_query(reinterpret_cast<GstElement *>(m_pipeline), frameDuration);
sint64 temp = 0;
gst_query_parse_duration(frameDuration, 0, &temp);

I have two problems with this approach. First, this works only after I called
GstBuffer *buffer = gst_app_sink_pull_buffer(m_appSink);
which is very annoying.
And the second problem is that it does not work at all if I change the filename of the filesrc:
gst_element_set_state(reinterpret_cast<GstElement *>(m_pipeline), GST_STATE_NULL);
setProperty(reinterpret_cast<GObject *>(aviSrc), "location", filename);
...

The duration is always the same for each new filename.
What could I do?

Kind Regards


Hella Aglaia Mobile Vision GmbH
Steffen Roeber
Firmware & Tools
Treskowstr. 14, D-13089 Berlin
Amtsgericht Berlin-Charlottenburg HRB 66976 B
Geschäftsführer: Kay Talmi

Fon:  [phone]
Fax:  [phone]
Mail: [hidden email]
URL: www.aglaia-gmbh.de

URL: www.mobilevision.de

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[Tim-Philipp Müller-2]

On Fri, 2012-03-09 at 09:34 +0100, [hidden email] wrote:

> I'm usng a pipeline that contains a filesrc, a decodebin, an appsink
> and some other elements. What I want to get is the duration of  the
> current element.
> For this I'm using
> GstQuery *frameDuration = gst_query_new_duration(GST_FORMAT_DEFAULT);
> gst_element_query(reinterpret_cast<GstElement *>(m_pipeline),
> frameDuration);
> sint64 temp = 0;
> gst_query_parse_duration(frameDuration, 0, &temp);
>
> I have two problems with this approach. First, this works only after I
> called
> GstBuffer *buffer = gst_app_sink_pull_buffer(m_appSink);
> which is very annoying.
> And the second problem is that it does not work at all if I change the
> filename of the filesrc:
> gst_element_set_state(reinterpret_cast<GstElement *>(m_pipeline),
> GST_STATE_NULL);
> setProperty(reinterpret_cast<GObject *>(aviSrc), "location",
> filename);
> ...

The duration should be available as soon as appsink (and all other
sinks) has queued a buffer internally and the pipeline is prerolled,
that is when you receive an ASYNC_DONE message on the bus (or a state
change message with new_state==PAUSED and message->src==pipeline).

There's no need to actually pull a buffer from appsink.

If you just want to read metadata, GstDiscoverer might also be of
interest.

As for changing filesrc - you should just set up a new filesrc +
decodebin2 (decodebin2 needs resetting as well) and remove the old
elements when no longer needed.

Cheers
 -Tim

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[Steffen.Roeber]

Hi,
I tried the GstDiscoverer utility. For local files all is fine but files from a network path cannot be discovered.

Hella Aglaia Mobile Vision GmbH
Steffen Roeber
Firmware & Tools
Treskowstr. 14, D-13089 Berlin
Amtsgericht Berlin-Charlottenburg HRB 66976 B
Geschäftsführer: Kay Talmi

Fon:  [phone]
Fax:  [phone]
Mail: [hidden email]
URL: www.aglaia-gmbh.de

URL: www.mobilevision.de

Dieses Dokument ist vertraulich zu behandeln. Die Weitergabe sowie Vervielfältigung, Verwertung und Mitteilung seines Inhalts ist nur mit unserer ausdrücklichen Genehmigung gestattet. Alle Rechte vorbehalten, insbesondere für den Fall der Schutzrechtsanmeldung.
This document has to be treated confidentially. Its contents are not to be pass
ed on, duplicated, exploited or disclosed without our express permission. All rights reserved, especially the right to apply for protective rights.

Tim-Philipp Müller/

(
Gesendet von: gstreamer-devel-bounces+steffen.roeber=[hidden email]

09.03.2012 11:27

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Discussion of the development of and with GStreamer        <[hidden email]>

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Thema	Re: decodebin2

On Fri, 2012-03-09 at 09:34 +0100, [hidden email] wrote:

> I'm usng a pipeline that contains a filesrc, a decodebin, an appsink
> and some other elements. What I want to get is the duration of  the
> current element.
> For this I'm using
> GstQuery *frameDuration = gst_query_new_duration(GST_FORMAT_DEFAULT);
> gst_element_query(reinterpret_cast<GstElement *>(m_pipeline),
> frameDuration);
> sint64 temp = 0;
> gst_query_parse_duration(frameDuration, 0, &temp);
>
> I have two problems with this approach. First, this works only after I
> called
> GstBuffer *buffer = gst_app_sink_pull_buffer(m_appSink);
> which is very annoying.
> And the second problem is that it does not work at all if I change the
> filename of the filesrc:
> gst_element_set_state(reinterpret_cast<GstElement *>(m_pipeline),
> GST_STATE_NULL);
> setProperty(reinterpret_cast<GObject *>(aviSrc), "location",
> filename);
> ...

The duration should be available as soon as appsink (and all other
sinks) has queued a buffer internally and the pipeline is prerolled,
that is when you receive an ASYNC_DONE message on the bus (or a state
change message with new_state==PAUSED and message->src==pipeline).

There's no need to actually pull a buffer from appsink.

If you just want to read metadata, GstDiscoverer might also be of
interest.

As for changing filesrc - you should just set up a new filesrc +
decodebin2 (decodebin2 needs resetting as well) and remove the old
elements when no longer needed.

Cheers
-Tim

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gstreamer-devel mailing list
[hidden email]
http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel


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