Video laggy after transcode

I have issue with transcoding, when I transcode H264 videos from my Panasonic DMC FT-3 camera, the video is extremely choppy. Videos from other cameras are fine, it does this just on this specific camera...
I am running immich 1.135.3 in docker on Unraid, on Intel Celeron G6900 cpu with transcode acceleration using Quicksync to H265
Attaching video demonstrating the bug, when the video is uploaded, it plays smoothly before transcode finishes, but after its done, its laggy
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