Hi,
I have an i5-8265u with Intel Graphic 620, GPU acceleration works during playback but not during rendering, so rendering times are longer.
To test GPU acceleration I run

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sudo intel_gpu_top

I tried to create a new profile as stated in the forum with various vaapi commands like this

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vaapi_device=/dev/dri/renderD128 vf='format=nv12,hwupload' properties=x264-medium f=mp4 vcodec=h264_vaapi threads=4 real_time=-1 preset=faster acodec=aac g=120 crf=%quality ab=%audiobitrate+'k'

but nothing helped

same issue with kdenlive:
18.12.3 from debian buster repository
19.04.2 from debian multimedia
19.04.3b appimage

Luca

Unfortunately GPU acceleration is not suppoerted due to a lot of bugs. It's on the to do list.

Kdenlive default h264 profile is non-hardware encoding:

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f=mp4 movflags=+faststart vcodec=libx264 progressive=1 g=15 bf=2 crf=%quality acodec=aac ab=%audiobitrate+'k'

Intel only hardware encoding is partially supported by MLT / Vaapi, it will reduce encoding time from 50min to 15min in my case (a 10min video).
Be sure to have mlt and movit package installed and enabled OpenGL & Movit in Kdenlive Playback setting (restart afterwards).

This custom render setting works on my Intel i7-6560u / iris 540 laptop:

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f=mp4 movflags=+faststart hwaccel_device=/dev/dri/renderD128 vf='format=nv12,hwupload' c:v=h264_vaapi vcodec=h264_vaapi threads=4 preset=medium g=15 bf=2 vb=13M acodec=aac ab=256k

Kdenlive 19.04.2 (Manjaro KDE)