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The encoder can skip frames totally should rate control overshoot the target bitrate too far. In this situation it generates an output buffer of length 0. V4L2 treats a buffer of length 0 as an end of stream flag, which is not appropriate in this case, therefore we can not return that buffer to the client. The driver was returning the buffer to videobuf2 in the QUEUED state, however that buffer was then not dequeued again, so the number of buffers was reduced each time this happened. In the pathological case of using GStreamer's videotestsrc in mode 1 for noise, this happens sufficiently frequently to totally stall the pipeline. If the port is still enabled then return the buffer straight back to the VPU rather than to videobuf2. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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:
https://www.kernel.org/doc/html/latest/
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.