correct colorspace for alpha to key+fill on decklink

[art vanderhoff]

I found it, I added the format the decklinkvideosink video-format=8bit-bgra
as well as keeping in the
 video/x-raw,format=BGRA,width=1920,height=1080

Art

On Wed, Jan 17, 2024 at 11:10 PM art vanderhoff <vanderhoffer at gmail.com>
wrote:

> Hello All,
>
> What is the correct colorspace for sending alpha to a decklink card or
> ultrastudio?
>
> Using OBS output I can see key + fill split out as expected.
>
> Trying this pipeline I get fill video duplicated to both outputs on the
> ultrastudio
> src video is available from
>
> https://www.videezy.com/abstract/50834-red-energy-wire-mesh-ball-with-alpha-channel
>
> gst-launch-1.0 \
> filesrc location=/home/video/200607_RedEnergyBallIsolateAlpha.mov !
> decodebin ! videoconvert \
> ! videoscale ! video/x-raw,width=1920,height=1080,framerate=30/1 \
> ! decklinkvideosink device-number=0 mode=1080p30
>
> I have tried setting profile as 1-4 and also setting the format  as BGRA
> || ARGB but this gives an error
> could not link videoscale0 to decklinkvideosink0 can't handle caps BGRA
>
> However the formats list include
> video/x-raw
>                   width: 1920
>                  height: 1080
>         pixel-aspect-ratio: 1/1
>          interlace-mode: progressive
>               framerate: [ 0/1, 2147483647/1 ]
>                  format: BGRA
>
> The file source report is
> /GstPipeline:pipeline0/GstDecodeBin:decodebin0/avdec_prores:avdec_prores0.GstPad:src:
> caps = video/x-raw, format=(string)A444_10LE, width=(int)3840,
> height=(int)2160, interlace-mode=(string)progressive,
> pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)bt709,
> framerate=(fraction)30/1
>
> Any thoughts would be helpful
>
> Thanks
> Art Vanderhoffer
>
>
>
>
>
>
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