[Libav-user] How to use ddagrab Filter Graph in libav C API

[Andrew Randrianasulu]

ср, 14 мая 2025 г., 21:38 Rakesh Chowdhury <rakeshchow202 at gmail.com>:

> Hello Andrew,
>
> Thanks a lot for responding! I appreciate it.
>
> I'm just pretty much new to libav and c++ is not really in my league.
>
> Is there any simple example I can follow?
>

may be here?

https://topic.alibabacloud.com/a/the-simplest-example-of-avdevice-based-on-ffmpeg-read-camera_8_8_31628710.html

links to

Https://sourceforge.net/projects/simplestffmpegdevice/



> Thank you very much again
>
> On Wed, May 14, 2025 at 7:21 PM Andrew Randrianasulu
> <randrianasulu at gmail.com> wrote:
> >
> > On Wed, May 14, 2025 at 4:38 PM Rakesh Chowdhury
> > <rakeshchow202 at gmail.com> wrote:
> > >
> > > Hello libav-devel,
> > >
> > > I'm new to the libav library and have been learning through FFmpeg
> > > tutorials and documentation.
> > >
> > > I'm trying to implement a screen capture functionality similar to the
> > > following FFmpeg command-line example using C code with libav:
> > >
> > > `ffmpeg -filter_complex ddagrab=0,hwdownload,format=bgra -c:v libx264
> > > -crf 20 output.mkv`
> > >
> > > Specifically, I'm looking for guidance on how to translate this
> > > particular filter graph (ddagrab=0,hwdownload,format=bgra) into the
> > > libav C API. I've searched online but haven't found any relevant
> > > examples for this specific combination of filters.
> > >
> > > Would someone be able to provide an example or point me towards
> > > resources that demonstrate how to achieve this screen capture and
> > > format conversion using libav in C?
> >
> > I only compiled recently this Linux screengragger utility, but
> > hopefully it contain some ideas?
> >
> > https://git.dec05eba.com/gpu-screen-recorder/about/
> >
> >
> > >
> > > Thank you for your time and assistance.
> > > _______________________________________________
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>
>
>
> --
>
> Signed-Off By: Rakesh Chowdhury
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