Hi,
The input format is the VA-API format (ie AV_PIX_FMT_VAAPI), as I'm passing a
hardware frame to the filter, though it is NV12 before I pass the frame to the
decoder, if that's relevant.
Thanks
------- Original Message -------
On Sunday, February 13th, 2022 at 9:10 PM, Wang, Fei W
<[email protected]> wrote:
> Hi,
>
> What's your input format? Maybe you can use ffmpeg cmdline to confirm it
> first, like:
>
> ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -v verbose -f
> rawvideo -pix_fmt nv12 -s:v 1280x720 -i input_NV12.yuv -vf
> 'hwupload,scale_vaapi=format=bgra,hwdownload,format=bgra' -f rawvideo -vsync
> passthrough -an -vframes 10 -y output_NV12_to_BGRA.yuv
>
> And more vaapi use case you can reference ffmpeg-vaapi wiki:
>
> https://trac.ffmpeg.org/wiki/Hardware/VAAPI
>
> Thanks
> Fei
>
>> From: Libav-user <[email protected]> On Behalf Of andr box
>> Sent: Monday, February 14, 2022 6:05 AM
>> To: This list is about using libavcodec, libavformat, libavutil, libavdevice
>> and libavfilter. <[email protected]>
>> Subject: Re: [Libav-user] Hardware scaling with libavfilter
>>
>> ne 13. 2. 2022 v 22:55 odesílatel icy_flurry via Libav-user
>> <[email protected]> napsal:
>>
>>> Hi,
>>>
>>> I'm trying to scale an image in hardware using VA-API with libavfilter. I
>>> also want to change the colorspace of the image to BGRA. However, the
>>> output frame I get is just a black image with a white line on top. How do I
>>> fix this? Let me know if more information is required.
>>>
>>> Code: https://pastecord.com/eqagejavum.cpp
>>>
>>> Thanks in advance
>>>
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