[FFmpeg-devel] [PATCH 5/5] lavd: Add KMS frame grabber

[Andy Furniss]

Mark Thompson wrote:
> On 15/09/17 00:15, Andy Furniss wrote:
>> Andy Furniss wrote:
>>> Mark Thompson wrote:
>>>> ---
>>>> Now sets the trusted packet flag; otherwise unchanged.
>>>>
>>>>
>>>>    configure                |   1 +
>>>>    libavdevice/Makefile     |   1 +
>>>>    libavdevice/alldevices.c |   1 +
>>>>    libavdevice/kmsgrab.c    | 455 +++++++++++++++++++++++++++++++++++++++++++++++
>>>>    4 files changed, 458 insertions(+)
>>>>    create mode 100644 libavdevice/kmsgrab.c
>>>>
>>>> diff --git a/configure b/configure
>>>> index 6581c53c1a..76a7591ceb 100755
>>>> --- a/configure
>>>> +++ b/configure
>>>> @@ -3040,6 +3040,7 @@ gdigrab_indev_select="bmp_decoder"
>>>>    iec61883_indev_deps="libiec61883"
>>>>    jack_indev_deps="jack"
>>>>    jack_indev_deps_any="sem_timedwait dispatch_dispatch_h"
>>>> +kmsgrab_indev_deps="libdrm"
>>>
>>> Doesn't get built for me = doesn't show up as indev after configure anything special needed?
>>
>> Never mind I found --enable-libdrm (had tried --enable-kmsgrab)
> 
> I assume you're going to try AMD + Mesa + VAAPI.
> 
> VAAPI_DISABLE_INTERLACE=1 ./ffmpeg_g -y -format bgr0 -device /dev/dri/card1 -f kmsgrab -i - -vsync 0 -init_hw_device vaapi=v:/dev/dri/renderD129 -filter_hw_device v -vf 'hwmap,scale_vaapi=w=1920:h=1080:format=nv12' -c:v h264_vaapi -profile 578 -bf 0 out.mp4
> 
> Three Mesa issues I had to get around:
> 
> * Device derivation doesn't work because the Mesa driver doesn't want to initialise on the DRM master device for some reason; making the matching device separately does work.
> * Against current git, you need to reapply the VAAPI_DISABLE_INTERLACE patch and use it - if not, the colour conversion just barfs because it wants interlaced surfaces.
> * The postproc scaler seems to only write the luma plane when converting from RGB - this is also visible when uploading normal RGB images, so just a bug somewhere.
> 
> With that, it works to record the screen in greyscale...
> 
> I have some other Mesa stuff to do queued up (libva2 with VAAPI export for EGL import on AMD), so I'll pursue these further soonish.

Thanks for the info, as it happens I am running some testing patches 
from Leo currently that fix up postproc deinterlace now the env is gone.

I'll point Leo at this mail and test this evening.


> 
> - Mark
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>