[GEM-dev] gem-mpv : high resolution video decoding in Gem

[Antoine Villeret]

hi

Le dim. 18 août 2019 à 16:41, Jack <jack at rybn.org> a écrit :

> Hi Antoine,
>
> I just tested this new object and thanks for it.
>
> Here my comments :
> - play and pause messages return mpv: no method for ...
>

This is a mistake, they should have been removed from help patcher.


> - i was expecting less usage of CPU than the couple
> gemframebuffer/pix_film. On my computer the CPU usage is the same.
>

it depends on the codec and hardware you're using.
If your codec can't be decoded on your hardware then it should be the same
as pix_film/gemframebuffer.
But I made this external when I need to display 2048x2048 video at 30 fps.
I tried several solution, including decoding the video with FFMPEG directly
and passing it through v4l2loopback to Gem.
But the only thing that works at 30fps was to use libmpv.


> - the sound of the video is audible, it will be nice to have x signal
> outlets (with x channels of sounds) from the mpv object.
>

indeed, that could be an improvement
PR are welcome :-)

+
a

>
> Hope, these comments can help.
> ++
>
> Jack
>
>
>
>
> Le 17/08/2019 à 14:50, Antoine Villeret a écrit :
> > Hi,
> >
> > I wrote an object based on gemframbuffer that uses libmpv
> > (https://mpv.io/) to decode a video file and output it directly to a
> > texture.
> > This circumvent the bottleneck of uploading the pixes to the GPU and
> > provides a wide range of codecs to Gem (if MPV can play your video, then
> > gem-mpv can too).
> > This have been successfully tested with 4K HAP video on Linux.
> > It also supports video with alpha channel.
> >
> > The source code is here : https://github.com/avilleret/gem-mpv
> > The build system is CMake, there is no binary release.
> > Follow the Readme to build it.
> > It has been only tested on Linux for now.
> >
> > Inside, it's more or less a wrapper around libmpv, that means every
> > properties and commands should be supported but only few have been
> > tested yet.
> > Some are documented in the help file, for the others, please refer to
> > libmpv help : https://mpv.io/manual/stable/
> >
> > Best regards
> >
> > Antoine
> >
> > _______________________________________________
> > GEM-dev mailing list
> > GEM-dev at lists.iem.at
> > https://lists.puredata.info/listinfo/gem-dev
> >
>
>
>
>
> _______________________________________________
> GEM-dev mailing list
> GEM-dev at lists.iem.at
> https://lists.puredata.info/listinfo/gem-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puredata.info/pipermail/gem-dev/attachments/20190818/43b1db8c/attachment.html>