Ivy Bridge平台编译FFmpeg后QSV硬件解码初始化失败的解决求助

大家好，我最近碰到了FFmpeg硬件解码的问题，想请教下各位大佬：

我之前跟着教程从源码编译了FFmpeg，但我的CPU是老款i7（Ivy Bridge平台），一开始FFmpeg没法初始化解码器。查了相关讨论后发现，Intel-Media-Driver并不适合这类老款i7，所以我换成了intel-vaapi-driver，之后重新编译了FFmpeg。

先给大家看看我的vainfo输出：

$ vainfo

Trying display: drm

libva info: VA-API version 1.17.0

libva info: Trying to open /usr/local/lib/dri/iHD_drv_video.so

libva info: va_openDriver() returns -1

libva info: Trying to open /usr/local/lib/dri/i965_drv_video.so

libva info: Found init function __vaDriverInit_1_17

libva info: va_openDriver() returns 0

vainfo: VA-API version: 1.17 (libva 2.17.0.pre1)

vainfo: Driver version: Intel i965 driver for Intel(R) Ivybridge Desktop - 2.4.0.pre1 (2.3.0-35-gab755cb)

vainfo: Supported profile and entrypoints

VAProfileMPEG2Simple            : VAEntrypointVLD

VAProfileMPEG2Simple            : VAEntrypointEncSlice

VAProfileMPEG2Main              : VAEntrypointVLD

VAProfileMPEG2Main              : VAEntrypointEncSlice

VAProfileH264ConstrainedBaseline: VAEntrypointVLD

VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice

VAProfileH264Main               : VAEntrypointVLD

VAProfileH264Main               : VAEntrypointEncSlice

VAProfileH264High               : VAEntrypointVLD

VAProfileH264High               : VAEntrypointEncSlice

VAProfileH264StereoHigh         : VAEntrypointVLD

VAProfileVC1Simple              : VAEntrypointVLD

VAProfileVC1Main                : VAEntrypointVLD

VAProfileVC1Advanced            : VAEntrypointVLD

VAProfileNone                   : VAEntrypointVideoProc

VAProfileJPEGBaseline           : VAEntrypointVLD

再看看FFmpeg里的QSV解码器情况：

$ ffmpeg -decoders | grep qsv

ffmpeg version N-109368-gcc11afe502 Copyright (c) 2000-2022 the FFmpeg developers

built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)

configuration: --prefix=/usr/local/ffmpeg --extra-cflags=-I/opt/intel/mediasdk/include --extra-ldflags=-L/opt/intel/mediasdk/lib --extra-ldflags=-L/opt/intel/mediasdk/plugins --enable-libmfx --enable-vaapi --enable-opencl --disable-debug --enable-libvorbis --enable-libvpx --enable-libdrm --enable-gpl --cpu=native --enable-libfdk-aac --enable-libx264 --enable-libx265 --extra-libs=-lpthread --enable-nonfree --enable-openssl

libavutil      57. 43.100 / 57. 43.100

libavcodec     59. 54.100 / 59. 54.100

libavformat    59. 34.102 / 59. 34.102

libavdevice    59.  8.101 / 59.  8.101

libavfilter     8. 51.100 /  8. 51.100

libswscale      6.  8.112 /  6.  8.112

libswresample   4.  9.100 /  4.  9.100

libpostproc    56.  7.100 / 56.  7.100

V....D av1_qsv              AV1 video (Intel Quick Sync Video acceleration) (codec av1)

V....D h264_qsv             H264 video (Intel Quick Sync Video acceleration) (codec h264)

V....D hevc_qsv             HEVC video (Intel Quick Sync Video acceleration) (codec hevc)

V....D mjpeg_qsv            MJPEG video (Intel Quick Sync Video acceleration) (codec mjpeg)

V....D mpeg2_qsv            MPEG2VIDEO video (Intel Quick Sync Video acceleration) (codec mpeg2video)

V....D vc1_qsv              VC1 video (Intel Quick Sync Video acceleration) (codec vc1)

V....D vp8_qsv              VP8 video (Intel Quick Sync Video acceleration) (codec vp8)

V....D vp9_qsv              VP9 video (Intel Quick Sync Video acceleration) (codec vp9)

不过当我运行这条简单的硬件解码命令时：

ffmpeg -hwaccel qsv -c:v h264_qsv -i ...

却弹出了错误：

[AVHWDeviceContext @ 0x5621dbd9f100] Failed to initialise VAAPI connection: -1 (unknown libva error).

Device creation failed: -5.

No device available for decoder: device type qsv needed for codec h264_qsv.

有没有朋友知道，我应该怎么调整FFmpeg的编译配置，才能让QSV正常支持我的Ivy Bridge CPU呢？

备注：内容来源于stack exchange，提问作者Daniel