audiovisualizer: fix buffer mapping to not increase refcount
Fixing the mapping of the buffers to pass along to the subclasses.
Reason:
...mapping the video frame writable without that flag will make the buffer non-writeable afterwards.
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Fixing the mapping of the buffers to pass along to the subclasses.
Reason:
...mapping the video frame writable without that flag will make the buffer non-writeable afterwards.