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v4l2codecs: h265: Minimize memory allocation

Benjamin Gaignard requested to merge benjamin.gaignard1/gstreamer:v4l2codecs_h265_reduce_memory_footprint into main

Be smarter when allocating sink and source memory pools to reduce the memory footprint.

Use gst_v4l2_decoder_get_render_delay() to know the need number of buffers for downstream element.

Improve error logs in case of memory issue.

Tested with fluster on IMX8MQ and the score is unchanged.

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