using gpu uncoding resulting in having white top layer

[akrram09]

when i use the vaapi option and record there is white transparent top layer on top, and when using default settings looks normal

-- using wf-recorder -c h264_vaapi -d /dev/dri/renderD128 -f vaapi.mp4
https://github.com/user-attachments/assets/41d9f23f-8e2b-493e-a162-bb41c51cefab

-- using wf-recorder -f record.mp4
https://github.com/user-attachments/assets/120e0591-e4b0-4228-a8a0-ebccd422a37f

[ammen99]

Does #332 help with this?