What is 'streaming thread'?

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What is 'streaming thread'?

wl2776
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This terms is met in many places of the GStreamer documentation, but I can't find its strict definition.
So, what is it, exactly? Or, please, point to the definition.
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Re: What is 'streaming thread'?

Tim-Philipp Müller-2
On Thu, 2011-01-13 at 00:24 -0800, wl2776 wrote:

> This terms is met in many places of the GStreamer documentation, but I can't
> find its strict definition.
> So, what is it, exactly? Or, please, point to the definition.

Any thread not created by the application, but by GStreamer. Often used
as 'streaming thread' (in which dataflow happens) vs. 'application
thread' (in which things like property setting/getting is usually done,
and state changes). There are usually multiple streaming threads in a
typical GStreamer pipeline. For application writers it rarely matters
which one it is exactly though, just that it's a different thread than
the main application's thread.

Cheers
 -Tim


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Re: What is 'streaming thread'?

Parveen Kumar Jain
Hi Tim,
 Just a small cross question on this:
 How one can control these no. of threads creation on a single
pipeline ? or if I put it in another way, how these threads get
created in gstreamer ?
e.g. does it depend on the no. of "elements" in a single pipeline or
some other factor matters.

Regards,
Parveen Jain


On Thu, Jan 13, 2011 at 3:14 PM, Tim-Philipp Müller <[hidden email]> wrote:

> On Thu, 2011-01-13 at 00:24 -0800, wl2776 wrote:
>
>> This terms is met in many places of the GStreamer documentation, but I can't
>> find its strict definition.
>> So, what is it, exactly? Or, please, point to the definition.
>
> Any thread not created by the application, but by GStreamer. Often used
> as 'streaming thread' (in which dataflow happens) vs. 'application
> thread' (in which things like property setting/getting is usually done,
> and state changes). There are usually multiple streaming threads in a
> typical GStreamer pipeline. For application writers it rarely matters
> which one it is exactly though, just that it's a different thread than
> the main application's thread.
>
> Cheers
>  -Tim
>
>
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Re: What is 'streaming thread'?

wl2776
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Parveen Kumar Jain wrote
 How one can control these no. of threads creation on a single
pipeline ? or if I put it in another way, how these threads get
created in gstreamer ?
This is covered in the docs.
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-threads.html
http://cgit.freedesktop.org/gstreamer/gstreamer/tree/docs/design/part-messages.txt  - GST_MESSAGE_STREAM_STATUS
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Re: What is 'streaming thread'?

wl2776
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In reply to this post by Tim-Philipp Müller-2
Thanks.

Also, do the terms 'streaming thread' and 'streaming task' have the same meaning?

Tim-Philipp Müller-2 wrote
> This term is met in many places of the GStreamer documentation, but I can't
> find its strict definition.
> So, what is it, exactly? Or, please, point to the definition.

Any thread not created by the application, but by GStreamer. Often used
as 'streaming thread' (in which dataflow happens) vs. 'application
thread' (in which things like property setting/getting is usually done,
and state changes).
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Re: What is 'streaming thread'?

Tim-Philipp Müller-2
On Thu, 2011-01-13 at 03:02 -0800, wl2776 wrote:

> Also, do the terms 'streaming thread' and 'streaming task' have the same
> meaning?

Yes (see the GstTask API which is convenience API for starting/stopping
threads in a GStreamer context).

Cheers
 -tim


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Re: What is 'streaming thread'?

timothe jahan
In reply to this post by wl2776
Hi,
After reading the doc on the thread (few weeks ago) I still had a question on multithreading for which I did not found the answer in the doc.
Does some plugin have their own multithreading capability ?
My interest is for the x264 encoder. Multithreading of the h264 encoding process is a mandatory thing as soon as you do live encoding.

If anybody knows about this...

Regards,
Timothe

On Thu, Jan 13, 2011 at 11:54 AM, wl2776 <[hidden email]> wrote:


Parveen Kumar Jain wrote:
>
>  How one can control these no. of threads creation on a single
> pipeline ? or if I put it in another way, how these threads get
> created in gstreamer ?
>

This is covered in the docs.
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-threads.html
http://cgit.freedesktop.org/gstreamer/gstreamer/tree/docs/design/part-messages.txt
- GST_MESSAGE_STREAM_STATUS

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Re: What is 'streaming thread'?

wl2776
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timothe jahan wrote
After reading the doc on the thread (few weeks ago) I still had a question
on multithreading for which I did not found the answer in the doc.
Does some plugin have their own multithreading capability ?
It depends on the plugin. For example, mpeg2 PS demuxer has.

timothe jahan wrote
My interest is for the x264 encoder. Multithreading of the h264 encoding
process is a mandatory thing as soon as you do live encoding.
You could search the source code for GstTask or GThread.
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Re: What is 'streaming thread'?

Tim-Philipp Müller-2
In reply to this post by timothe jahan
On Thu, 2011-01-13 at 12:55 +0100, timothe jahan wrote:

> Does some plugin have their own multithreading capability ?
> My interest is for the x264 encoder. Multithreading of the h264
> encoding process is a mandatory thing as soon as you do live encoding.

This is done at the x264 library level and hidden from both GStreamer
and the application (but configurable of course, see gst-inspect
x264enc).

Cheers
 -Tim



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Re: What is 'streaming thread'?

timothe jahan
Thank you both for your fast and accurate answers

Regards,
Timothe

On Thu, Jan 13, 2011 at 3:14 PM, Tim-Philipp Müller <[hidden email]> wrote:
On Thu, 2011-01-13 at 12:55 +0100, timothe jahan wrote:

> Does some plugin have their own multithreading capability ?
> My interest is for the x264 encoder. Multithreading of the h264
> encoding process is a mandatory thing as soon as you do live encoding.

This is done at the x264 library level and hidden from both GStreamer
and the application (but configurable of course, see gst-inspect
x264enc).

Cheers
 -Tim



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