I wonder if "Settings|Preferences|Performance|Use HW Device" is meant to set both gpu accelerated decoding and encoding (rendering)? and how does this possibly interact/work with selecting video preset, compression hwaccel methods or not? Use HW Device has available 5 options: none, vaapi, vdpau, cuda, vulkan, while qsv is missing, reason? I ran two av1_qsv rendering tests on Intel AlderLake/DG2 Using HW Device: None and vaapi respectively to exemplify this using the latest Cinelerra Infinity - built: Mar 1 2026 06:30:41 1) Settings|Preferences|Performance|Use HW Device: None file: hdv09_04.m2t compression av1_qsv_8b420.mp4 # Requires specific GPU hardware encoding capability # as well as required software implementation. cin_pix_fmt=nv12 profile=main # global_quality=25 libva info: VA-API version 1.23.0 libva info: Trying to open /usr/lib64/dri/iHD_drv_video.so libva info: Found init function __vaDriverInit_1_22 libva info: va_openDriver() returns 0 libva info: VA-API version 1.23.0 libva info: Trying to open /usr/lib64/dri/iHD_drv_video.so libva info: Found init function __vaDriverInit_1_22 libva info: va_openDriver() returns 0 Render::render_single: Session finished. ** rendered 5972 frames in 18.274 secs, 326.803 fps audio0 pad 64 0 (64) Fast and adequate quality/colors, although global quality may increase it somewhat. 2) Settings|Preferences|Performance|Use HW Device: vaapi (just to test) file: hdv09_04.m2t compression av1_qsv_8b420.mp4 # Requires specific GPU hardware encoding capability # as well as required software implementation. cin_pix_fmt=nv12 profile=main # global_quality=25 libva info: VA-API version 1.23.0 libva info: Trying to open /usr/lib64/dri/iHD_drv_video.so libva info: Found init function __vaDriverInit_1_22 libva info: va_openDriver() returns 0 libva info: VA-API version 1.23.0 libva info: Trying to open /usr/lib64/dri/iHD_drv_video.so libva info: Found init function __vaDriverInit_1_22 libva info: va_openDriver() returns 0 int FFVideoConvert::convert_picture_vframe(VFrame*, AVFrame*, AVFrame*): Error retrieving data from GPU to CPU file: /Videoklipp/AV1/hdv09_04.m2t int FFVideoConvert::convert_picture_vframe(VFrame*, AVFrame*, AVFrame*): Error retrieving data from GPU to CPU file: /Videoklipp/AV1/hdv09_04.m2t int FFVideoConvert::convert_picture_vframe(VFrame*, AVFrame*, AVFrame*): Error retrieving data from GPU to CPU file: /Videoklipp/AV1/hdv09_04.m2t Render::render_single: Session finished. ** rendered 5972 frames in 33.049 secs, 180.701 fps audio0 pad 64 0 (64) Decoder libdav1d does not support device type vaapi. HW device init failed, using SW decode. file:/Videoklipp/QSV/hdv09-04_cin_av1_qsv_8b420.mp4 err: Operation not permitted Decoder libdav1d does not support device type vaapi. HW device init failed, using SW decode. file:/Videoklipp/QSV/hdv09-04_cin_av1_qsv_8b420.mp4 err: Operation not permitted Total excess of backups: -50 Session time: 0:22:43 Cpu time: user: 0:01:24.375 sys: 0:00:14.084 unjoined tids / owner 3 00007f88517ff6c0 / 00007f88d16b96c0 12RenderEngine 00007f886b7fe6c0 / 00007f88d16b96c0 12RenderEngine 00007f88797fa6c0 / 00007f88d16b96c0 12RenderEngine