How to crop video on Android/Gstreamer with glimagesink
nicolas at ndufresne.ca
Sun Feb 2 14:28:47 UTC 2020
Le samedi 01 février 2020 à 20:58 -0800, Gregoire Gentil a écrit :
> Thank you very much for the hint. I don't receive individual devel email
> so I can't reply to your answer on the mailing list :-(
> It seems that gltransformation might do the trick for me.
You are right, I had forgotton about this one. Would be nice to add
VideoCropMeta support in that one, and integrated this into the
transformation pipeline. That would allow:
.. ! videocrop top=100 ! glimagesink
To be gpu cropped.
> Are the two following pipelines "equivalent" in terms of CPU and GPU
> usage if nothing is changed in gltransformation?
> decodebin ! queue ! glupload ! glcolorconvert ! gltransformation !
> decodebin ! glimagesink
glimagesink is a bin that contains multiple elements. The internal
pipeline should be:
glupload ! glcolorconvert ! glcolorbalance ! glimagesinkelement
Placing gltransformation after glcolorconvert seems to be the correct
approach. Again sorry for having forgotten about this element. I have
CCed the mailing list to share this knowledge.
> On 2/1/20 1:21 PM, Gregoire Gentil wrote:
> > Hello,
> > I would like to crop the rendering of a video playback in Android which
> > uses glimagesink.
> > I can do the job by inserting a videocrop element before glimagesink but
> > I would like to achieve the same goal by using the "render-rectangle"
> > property of glimagesink - the objective is that the crop operation is
> > done by the GPU, not the CPU. That doesn't work.
> > gst_video_overlay_set_render_rectangle doesn't work either.
> > Am I missing something?
> > Thanks in advance,
> > Grégoire
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