Help on video demux plugin

[Myzhar]

Hi all,
I'm writing a plugin that receives a single stream composed of two frames
stitched in top/down configuration.
The plugin should copy the two image in two different buffers and push them
in two separated source pads.

For some reason the `chain` function is not working and fails trying to
unmap the first of the two buffers after pushing:
*gst_buffer_unmap: assertion 'GST_IS_BUFFER (buffer)' failed*

This is my code





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