continuation from a previous thread

[Cin]Re: Adding CIN_HW_DEV=qsv for GPU HW decoding?
https://lists.cinelerra-gg.org/archives/list/cin@lists.cinelerra-gg.org/message/BDBIUNEMB2Z7VJQF4ORY32RHI2775AFY/

The current Slowroll update on Alder Lake /DG2 verifies use of

vainfo | grep version
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_23
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.23 (libva 2.23.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 26.1.1 ()


Before further testing I had to rebuild my Cingg already patched with
    0001-QSV-hw-decoder-test.patch


cd /home3/cinelerra/cinelerra-5.1

make clean

Edited the build.sh as a "current, all-in-one" ./configure line with libsvtav1, onevpl og vulkan

cat bld.sh

#!/bin/bash
#  IMPORTANT comments below to change the configure line
# For newer operating system versions, add --enable-libsvtav1
# For really old versions, such as ubuntu 16, add --enable-libaom=no
# Faster compile if include --disable-x265_hidepth
# To add OpenCV plugins, add --with-opencv=sta,tar=https://download.cinelerra-gg.org/download.php?file=opencv%2Fopencv-20200306.tgz
#
# original ./configure --with-single-user --with-booby
#
# 12.03.2026 extended ./configure with Intel QSV api and Vulkan api and filters
# --with-onevpl           Intel QSV api for unix (no)
# --with-vulkan           Vulkan api (no)
# --with-libplacebo       libplacebo ffmpeg Vulkan filter (no)
# --with-libzimg          libzimg ffmpeg filter (no)
#
( ./autogen.sh
  ./configure --with-single-user --with-booby --enable-libsvtav1 --with-onevpl --with-vulkan --with-libplacebo --with-libzimg
  make && make install ) 2>&1 | tee log
mv Makefile Makefile.cfg
cp Makefile.devel Makefile


This required two additional dependency packages on Slowroll before the script ran through

zypper in libplacebo-devel zimg-devel

./bld.sh

--------------------------

cd /home3/cinelerra/cinelerra-5.1
bin/cin
Cinelerra Infinity - built: Mar 12 2026 23:52:16

Settings|Preferences|Performance|Use HW Device: none
----

Testing QSV decoding in CPU vs GPU respectively, that is before and after adding remap decoder mpeg2_qsv, shows that decoding in GPU isn't different faster than on CPU in this case, but moving most workload to the GPU should offload the CPU:

cat bin/ffmpeg/decode.opts
# apply at init decode
loglevel=fatal
formatprobesize=5000000
scan_all_pmts=1
remap_video_decoder libaom-av1=libdav1d
remap_video_decoder mpeg2video=mpeg2_qsv

mpeg2video -> h264_qsv
======================
CPU:
** rendered 5972 frames in 24.463 secs, 244.124 fps
audio0 pad 64 0 (64)

intel_gpu_top Video: < = 29%
-------------
GPU:
** rendered 5972 frames in 24.562 secs, 243.140 fps
audio0 pad 64 0 (64)

intel_gpu_top Video: < = 42%


mpeg2video -> hevc_qsv
======================
CPU:
** rendered 5972 frames in 21.910 secs, 272.570 fps
audio0 pad 64 0 (64)

intel_gpu_top Video: < = 24%
--------------
GPU:
** rendered 5972 frames in 22.666 secs, 263.478 fps
audio0 pad 64 0 (64)

intel_gpu_top Video: < = 38%


mpeg2video -> av1_qsv
======================
CPU:
** rendered 5972 frames in 24.330 secs, 245.458 fps
audio0 pad 64 0 (64)

intel_gpu_top Video: < = 24%    
--------
GPU:
** rendered 5972 frames in 24.451 secs, 244.244 fps
audio0 pad 64 0 (64)

intel_gpu_top Video: < = 39%