HW Accel

OS	HW Acceleration
Linux	QSV, NVENC, AMF, VA-API
Windows	QSV, NVENC, AMF
MacOS	VideoToolbox
RPi	V4L2

Vendor	HW Acceleration
NVIDIA	NVENC
AMD	AMF, VA-API
Intel	QSV, VA-API
Apple	VideoToolbox
RPi	V4L2

Project	Graphics Gen	Repo
oneVPL	gen12+	oneapi-src/oneVPL
iHD driver	gen8+	intel/media-driver
Libva	gen5+	intel/libva
MSDK	gen8 ~ gen12(Rocket Lake)	Intel-Media-SDK/MediaSDK
i965 driver	gen5 ~ gen9.5	intel/intel-vaapi-driver

Intel QuickSync (QSV)
- 基于 VAAPI
没有硬解支持 H.264 / AVC 10-bit
- 升级为 HEVC 10-bit
/usr/lib/dri/ - 安装的驱动
- iHD_drv_video.so
- i965_drv_video.so
/dev/dri/render* DRM render node
i915
i965

bash

cat /proc/cpuinfo | grep "model name" | uniq

apk add pciutils
lspci -nn | egrep -i "3d|display|vga"

apk add lshw
lshw -C display
lshw -c video

apk add inxi
inxi -G

# i915_cur_delayinfo
sudo sh -c 'cat /sys/kernel/debug/dri/*/name'


ls /dev/dri

# VA-API
# ==========
# AlpineLinux edge/testing libva-utils
apk -X https://mirrors.sjtug.sjtu.edu.cn/alpine/edge/testing add libva-utils
vainfo
# https://github.com/intel/libva-utils
# /dev/dri/renderXX

# Intel QSV
# =============
apk add intel-media-driver libva-intel-driver
sudo LIBVA_TRACE=/tmp/libva_trace.log DRI_PRIME=1 LIBVA_DRIVER_NAME=iHD vainfo

LIBVA_TRACE=/tmp/libva_trace.log DRI_PRIME=1 LIBVA_DRIVER_NAME=iHD ffmpeg -loglevel verbose -init_hw_device vaapi

# options i915 enable_guc=3
# options i915 enable_fbc=1
echo "options i915 force_probe=4692" | sudo tee /etc/modprobe.d/i915.conf

# GPU freq
sudo find /sys -type f -name gt_cur* -print0

# X11
# ==========
# apk add vdpauinfo
# vdpauinfo
grep -iE 'vdpau | dri driver' /var/log/Xorg.0.log

# FFMpeg
# =======
ffmpeg -hide_banner -decoders | grep qsv # 判断是否有加速
ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -i "video.MP4" -vf "select=eq(pict_type\,I)" -vsync vfr -qscale:v 2 -f image2 "%08d.jpg"

FFmpeg

{h264,hevc}_{videotoolbox,amf,vaapi}
- videotoolbox - macOS
- amf - Windows
- vaapi - Linux - vainfo
-hwaccel auto
- dxva2,cuda,d3d11va,videotoolbox
- -hwaccel_device

bash

ffmpeg -encoders | grep videotoolbox # 支持的 videotoolbox 编码
ffmpeg -h encoder=h264_videotoolbox  # 查看编码器选项

ffprobe in.mp4                           # 弄清楚原始 bitrate
ffmpeg -b:v 1900k -c:v h264_videotoolbox # -b:v 匹配原始 bitrate

# 使用 hwaccel 方式 - 外置 GPU
ffmpeg \
  -hwaccel videotoolbox -i in.mp4 \
  -c:v libx265 -preset medium -crf 28 \
  -c:a copy \
  out.mp4