Can we check when an element's sink pad receives a buffer to add custom data to it

[Nostalgia]

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[Arjen Veenhuizen]

Yes, you are looking for buffer probes, see
https://gstreamer.freedesktop.org/documentation/design/probes.html and
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#gst-pad-add-probe

You can change the data in the buffer as well, but someone else can probably
explain it better than I can;). W.r.t. metadata: AFAIK not all elements pass
metadata transparently (but that might have changed in 1.12/1.14).



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