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

[Jack]

Hi !

Le 18/08/2019 à 17:44, Antoine Villeret a écrit :
> hi
> 
> Le dim. 18 août 2019 à 16:41, Jack <jack at rybn.org
> <mailto: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.

OK, I got the last version and it is OK now.

>  
> 
>     - 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.

OK.

>  
> 
>     - 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 :-)

Done !
++

Jack


> 
> +
> 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
>     >
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> 
> 
> 
> 
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