From: Andriy Gelman <andriy.gel...@gmail.com>
Signed-off-by: Andriy Gelman <andriy.gel...@gmail.com>
---
doc/decoders.texi | 27 +++++++++++++++++++++++++++
doc/encoders.texi | 42 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 69 insertions(+)
diff --git a/doc/decoders.texi b/doc/decoders.texi
index f18226b3504..7827a055408 100644
--- a/doc/decoders.texi
+++ b/doc/decoders.texi
@@ -86,6 +86,33 @@ AVS2-P2/IEEE1857.4 video decoder wrapper.
This decoder allows libavcodec to decode AVS2 streams with davs2 library.
+@section v4l2m2m
+
+libavcodec supports a set of v4l2m2m wrappers for interfacing with
+hardware decoders. Depending on the hardware's capabilties the following
decoders may be selected:
+h264, hevc, mpeg1, mpeg2, mpeg4, h263, vc1, vp8, and vp9.
+
+To use a specifix decoder append a _v4l2m2m suffix. For example to select h264
+decoder use:
+@example
+ffmpeg -codec:v h264_v4l2m2m -i INPUT OUTPUT
+@end example
+
+The following options are supported:
+@table @option
+@item num_output_buffers
+Number of memory mapped buffers to store the input packets.
+This value is only a suggestion to the hardware device. The device will
attempt to
+allocate the number of buffers, but the actual value may be smaller/larger and
+ultimately depends on the device. The default for the option is 16, minimum is
+6, and any large value (representable by an int) is accepted for the max.
+
+@item num_capture_buffers
+Number of memory mapped buffers to store the decompressed frames. The
allocation
+description is the same as above. Default is 20, minimum is 20, and any large
+value (representable by an int) is accepted for the max.
+@end table
+
@c man end VIDEO DECODERS
@chapter Audio Decoders
diff --git a/doc/encoders.texi b/doc/encoders.texi
index 61e674cf968..a600e76b1b9 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -3117,6 +3117,48 @@ required to produce a stream usable with all decoders.
@end table
+@section v4l2m2m
+
+libavcodec supports a set of v4l2m2m wrappers for interfacing with hardware
encoders.
+Depending on the hardware's capabilities the following encoders may be
selected:
+mpeg4, h263, h264, hevc, and vp8.
+
+To use a specific encoder append _v4l2m2m suffix. For example to select h264
use:
+@example
+ffmpeg -i INPUT [-pix_fmt pixfmt] -codec:v h264_v4l2m2m OUTPUT
+@end example
+In some cases, it may be necessary to insert a pixel format conversion with
+@code{-pix_fmt}. This is required if the pixel format of the input does not
+match the format of the encoder. If there is a mismatch, libavcodec will
+exit and specify the required pixfmt to use.
+
+The following options are supported:
+@table @option
+@item num_output_buffers
+Number of memory mapped buffers to store the input frames.
+This value is only a suggestion to the hardware device. The device will
attempt to
+allocate the number of buffers, but the actual value may be smaller/larger and
+ultimately depends on the device. The default for the option is 16, minimum is
+6, and any large value (representable by an int) is accepted for the max.
+
+@item num_capture_buffers
+Number of memory mapped buffers to store the compressed packets. The allocation
+description is the same as above. Default is 4, minimum is 4, and any large
+value (representable by an int) is accepted for the max.
+@end table
+
+Standard libavcodec options that can be set are:
+@itemize
+@item
+@option{g} / @option{gop_size}
+@item
+@option{qpel}
+@item
+@option{qmin}
+@item
+@option{qmax}
+@end itemize
+
@section vc2
SMPTE VC-2 (previously BBC Dirac Pro). This codec was primarily aimed at
--
2.24.1
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