Detect and Make Available FFmpeg's QSV/NVENC/AMF Encoders

[jpyper]

While I do currently use rigaya's QSV encoder only with FastFlix, it might be a useful to keep everything in one place and make available FFmpeg's hardware encoders, if they are compiled in and detected. One API/command line for everything to simplify all encoding needs. Keep the option to use rigaya's encoders in the Settings menu if the user wants to use them as well. More is better, right? Just food for thought.

[user@host ~/src/gh/qsvenc.git]$ ./qsvencc --version
QSVEncC (x64) 7.85 (r3681) by rigaya, Apr 15 2025 20:36:04 (gcc 14.2.1/Linux)
Intel Media SDK API v2.13

FFmpeg included with currently fully updated Manjaro Linux.

[user@host ~]$ ffmpeg -version
ffmpeg version n7.1 Copyright (c) 2000-2024 the FFmpeg developers
built with gcc 14.2.1 (GCC) 20250207

[user@host ~]$ ffmpeg -hide_banner -encoders | grep -i qsv
V..... av1_qsv AV1 (Intel Quick Sync Video acceleration) (codec av1)
V..... h264_qsv H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (Intel Quick Sync Video acceleration) (codec h264)
V..... hevc_qsv HEVC (Intel Quick Sync Video acceleration) (codec hevc)
V..... mjpeg_qsv MJPEG (Intel Quick Sync Video acceleration) (codec mjpeg)
V..... mpeg2_qsv MPEG-2 video (Intel Quick Sync Video acceleration) (codec mpeg2video)
V..... vp9_qsv VP9 video (Intel Quick Sync Video acceleration) (codec vp9)

[user@host ~]$ ffmpeg -hide_banner -encoders | grep -i nvenc
V....D av1_nvenc NVIDIA NVENC av1 encoder (codec av1)
V....D h264_nvenc NVIDIA NVENC H.264 encoder (codec h264)
V....D hevc_nvenc NVIDIA NVENC hevc encoder (codec hevc)

[user@host ~]$ ffmpeg -hide_banner -encoders | grep -i amf
V....D av1_amf AMD AMF AV1 encoder (codec av1)
V....D h264_amf AMD AMF H.264 Encoder (codec h264)
V....D hevc_amf AMD AMF HEVC encoder (codec hevc)