Best way to add a filter inside PlayBin2

[Stefan Sauer]

On 02/08/2012 06:27 PM, Jacques Bride wrote:
> Hello
>
> I am developing a frame enhancement filter for the need of a video
> control application. I am developing on a OMAP4 pandabaord on ubuntu
> with the Texas Instruments hardware accelerated gstreamer pipeline
> (1080PPfps decode), anyhow I think my question is rather general.  I
> am a beginner in gstreamer so please do not hesitate to redirect me to
> the doc if my question is already answered somewhere.
>
> My project consists in a video filter that transforms the yuv decoded
> frames before being displayed (for example a sepia filter to display
> frames in sepia color).
>
> What is the best way to add my filter in the installed gstreamer
> pipeline such that it becomes part of my video chain?
>
> Please see below more details:
> - I wish to use the installed and omap4 optimized gstreamer/totem
> pipeline to enable full video stream
> decode and display with my filter on
One way is to set a custom video sink, which is a bin containing your
effect ! autovideosink. If you can't modify the apps, you will need to
install that custom video sink bin and set the RANK to be e.g.
PRIMARY+10 so that it is automatically chosen.

Stefan

> .
> - I created  a gstreamer plugin/element for my filter with the
> gst-template framework, but how to make it part of GstPlayBin2?
> - I looked at the pipeline graph of totem and gst-launch: they both
> use the playbin2 module, and I would like to add my filter in-between
> GstURIDecodeBin and GstPlaySink (input from src0 and output to
> video_raw_sink  through gstinputselector). Is is possible to add and
> link a new element  here without breaking the full bin? It is not
> either on the input or the output of playbin2 so I do not really
> understand how to just create a playbin2 element in my application and
> delicately insert a new element inside...
> - do I have to modify the source code of PlayBin2, add my filter,
> recompile and install it on my board to have my added features
> naturally enabled when I play videos? Or is it possible to tell
> existing gst-launch and totem applications to add a user filter plugin
> in the installed video processing?
>
> Thanks for your help
> Jacques
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