On 13-01-2020 09:41 am, Andriy Gelman wrote:
From: Andriy Gelman <andriy.gel...@gmail.com>
Signed-off-by: Andriy Gelman <andriy.gel...@gmail.com>
---
doc/decoders.texi | 12 ++++++++++++
doc/encoders.texi | 27 +++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/doc/decoders.texi b/doc/decoders.texi
index f18226b3504..222f681810b 100644
--- a/doc/decoders.texi
+++ b/doc/decoders.texi
@@ -86,6 +86,18 @@ AVS2-P2/IEEE1857.4 video decoder wrapper.
This decoder allows libavcodec to decode AVS2 streams with davs2 library.
+@section v4l2m2m
+
+@command{ffmpeg} 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.
If these decoders are available through lavc API then replace ffmpeg
with libavcodec. Is there a command for a user to identify which
decoder/encoders are available?
Also, s/capabilties/capabilities
+
+To use a specifix decoder append a _v4l2m2m suffix. For example to select h264
s/specifix/specific
+decoder use:
+@example
+ffmpeg -codec:v h264_v4l2m2m -i INPUT OUTPUT
+@end example
+
@c man end VIDEO DECODERS
@chapter Audio Decoders
diff --git a/doc/encoders.texi b/doc/encoders.texi
index 61e674cf968..6cb43aedbce 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -3117,6 +3117,33 @@ required to produce a stream usable with all decoders.
@end table
+@section v4l2m2m
+
+@command{ffmpeg} supports a set of v4l2m2m wrappers for interfacing with
hardware encoders.
+Depending on the hardware's capabilties the following encoders may be selected:
+mpeg4, h263, h264, hevc, and vp8.
Same notes as for decoders.
+
+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} option. This is required if the pixel format of the input does
not
+match the format of the encoder. If there is a mismatch, @command{ffmpeg} will
+exit and specify the required pixfmt to use.
+
+The following standard libavcodec options are supported:
+@itemize
+@item
+@option{g} / @option{gop_size}
+@item
+@option{qpel}
+@item
+@option{qmin}
+@item
+@option{qmax}
+@end itemize
+
I see both the decoder and encoder wrappers have options for nb of
capture and output buffers. Should document these with description,
range and default values.
@section vc2
SMPTE VC-2 (previously BBC Dirac Pro). This codec was primarily aimed at
Thanks,
Gyan
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