For H.265, the preset slow appears to have more blocking artifacts (mosaic) than the preset ultrafast, which makes the quality of preset_slow look worse. We test it with the sample code: /usr/src/jetson_multimedia_api/samples/01_video_encode#./video_encode car.yuv 1920 1080 H265 car_hpt1_presetUlt…

The quality of preset slow is worse than that of preset ultrafast on H.265

DaneLLL July 18, 2025, 11:15pm 6

Hi,
We will check it. Would be great if you can help compare PSNR for reference. Please refer to the commands in
H264 vs H265 - #4 by DaneLLL

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