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Limit the number of allowed video callbacks. This helps with limiting
the size of the coded input FIFO which in turn helps to control latency.
Choose -5 as the magic number as it translates to DPB+5 buffers which
has been proven to be a good number in the past.

Ideally coded buffers would not be returned to the user until they
had been decoded into the DPB or been discarded as bad, but that grade
of control is unavailable to us.

Signed-off-by: John Cox <>


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Linux kernel

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.


Kernel source tree for Raspberry Pi Foundation-provided kernel builds. Issues unrelated to the linux kernel should be posted on the community forum at




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