Re: [FFmpeg-devel] [PATCH 1/6] doc/v4l2_m2m: Add documentation
On Mon, 13. Jan 10:56, Gyan wrote:
>
>
> On 13-01-2020 09:41 am, Andriy Gelman wrote:
> > From: Andriy Gelman
> >
> > Signed-off-by: Andriy Gelman
> > ---
> > 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.
Thanks, will update.
> Is there a command for a user to identify which decoder/encoders
> are available?
At the moment this doesn't exist.
But I do have a patch that lists the supported encoders/decoders.
I'll send this in the next version.
>
> Also, s/capabilties/capabilities
>
> > +
> > +To use a specifix decoder append a _v4l2m2m suffix. For example to select
> > h264
> s/specifix/specific
will update both.
>
> > +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.
yep, will add this.
Thanks,
--
Andriy
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Re: [FFmpeg-devel] [PATCH 1/6] doc/v4l2_m2m: Add documentation
On 13-01-2020 09:41 am, Andriy Gelman wrote:
From: Andriy Gelman
Signed-off-by: Andriy Gelman
---
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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[FFmpeg-devel] [PATCH 1/6] doc/v4l2_m2m: Add documentation
From: Andriy Gelman
Signed-off-by: Andriy Gelman
---
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.
+
+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
+
@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.
+
+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
+
@section vc2
SMPTE VC-2 (previously BBC Dirac Pro). This codec was primarily aimed at
--
2.24.0
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