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YUV444 pipeline support is not added in the vcu_gst_app in this beta release. As an alternative a user would need to use the provided scripts or could also directly use gst-launch commands.
Make sure that the HDMI-RX is configured to 4kp30 mode to run the below pipelines.
Make sure the scalar is set with respective YUV444 format (8-bit or 10-bit) to run the below pipelines. (check section-8 for media-ctl commands)
YUV444 8-bit pipelines
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