Good example to show usage of tee

[William Manley]

On 09/11/12 16:53, Nathanael D. Noblet wrote:
> On 11/09/2012 12:44 AM, Baby Octopus wrote:
>> Thanks for your suggestion. I see gst_launch_parse takes in commandline
>> string and then creates a pipeline based on this, which actually
>> simplifies
>> my task. But all I want to know is, is this the right way to create a
>> pipeline even when you are creating a product of your own, which you will
>> market? Can I create any possible pipeline using gst_parse_launch(or
>> gst-launch) ?
>
> I would expect that you want to manually build the pipes. Often with
> complex pipes you need to attach to signals/events and doing so requires
> knowing the element etc.. which is easier if you instantiated it
> directly than searching through a pipeline for a matching element...

I disagree.  With complex pipes I think parse_launch becomes even more
helpful as it becomes harder to visualise what the pipeline actually
contains, particularly with teeing and muxing, etc.  You can use
gst_bin_get_by_name to easily retrieve the elements.

This has been a curiosity of mine for a while, what is the reason that
the examples don't use parse_launch more often.  For example, Christian
Schaller's recent blog post "GStreamer, Python and videomixing"[1]
"manually" constructs a Gstreamer pipeline over several lines.  This
compares to this parse_launch equivalent:

gst.parse_launch('v4l2src ! video/x-raw,width=320,height=240 !
videoconvert ! textoverlay ! videobox border-alpha=0 top=0 left=-320 !
mixer.'
                  'v4l2src ! video/x-raw,width=320,height=240 !
theoraenc ! rtptheorapay ! rtptheoradepay ! theoradec ! videoconvert !
mixer.'
                  'videomixer name=mixer ! videoconvert ! xvimagesink')

Christian clearly knows far more about gstreamer and has more experience
than I do so I'm left wondering what it is that I've missed that means
that those many lines would be preferable to the above.

Anyone?

[1]:
http://blogs.gnome.org/uraeus/2012/11/08/gstreamer-python-and-videomixing/


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