2. 编码参数
支持的编码参数，可通过ffmpeg -h查看帮助文档，如：
ffmpeg -h encoder=hevc_mxenc
支持的硬件编码器包含h264_mxenc、hevc_mxenc、mjpeg_mxenc。
h264_mxenc上查看编码参数，如下所示:
ffmpeg version n4.4.3-39-g1914aedcc1-VERSION--build_data:2025-04-04_04:56:43,branch:,commit_id:1914aedcc1 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
configuration: --disable-asm --enable-metax --enable-shared --enable-cross-compile --enable-gpl --enable-libx264 --enable-libx265 --enable-libaom --enable-libdavs2 --enable-libxavs2 --enable-libopus --enable-libfreetype --enable-libvmaf --enable-version3 --enable-avresample --disable-sndio --disable-xlib --disable-alsa --disable-sdl2 --extra-version='VERSION--build_data:2025-04-04_04:56:43,branch:,commit_id:1914aedcc1' --extra-cflags=-I/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/include --extra-cflags=-I/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/include/mcr --extra-cflags=-I/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/ffmpeg/thirdparty/include --extra-ldflags=-L/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/lib --extra-ldflags=-L/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/ffmpeg/thirdparty/lib --extra-libs=-lmcruntime --extra-libs=-lmxkw --extra-libs=-lmxc-runtime64 --extra-libs=-lmcimage --prefix=/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/ffmpeg
libavutil 56. 70.100 / 56. 70.100
libavcodec 58.134.100 / 58.134.100
libavformat 58. 76.100 / 58. 76.100
libavdevice 58. 13.100 / 58. 13.100
libavfilter 7.110.100 / 7.110.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
libpostproc 55. 9.100 / 55. 9.100
Encoder h264_mxenc [METAX VPUE H.264 encoder]:
General capabilities: delay hardware
Threading capabilities: none
Supported hardware devices: metax metax
Supported pixel formats: yuv420p yuv420p10le nv12 p010le metax
h264_mxenc AVOptions:
-preset <int> E..V....... Set the encoding preset (from 0 to 5) (default faster)
veryfast 0 E..V.......
faster 1 E..V.......
fast 2 E..V.......
medium 3 E..V.......
slow 4 E..V.......
slower 5 E..V.......
-profile <int> E..V....... Set the encoding profile (from -1 to 3) (default auto)
auto -1 E..V.......
baseline 0 E..V.......
main 1 E..V.......
high 2 E..V.......
high10 3 E..V.......
-level <int> E..V....... Set the encoding level restriction (from -1 to 99) (default auto)
auto -1 E..V.......
1 10 E..V.......
1.0 10 E..V.......
1b 99 E..V.......
1.0b 99 E..V.......
1.1 11 E..V.......
1.2 12 E..V.......
1.3 13 E..V.......
2 20 E..V.......
2.0 20 E..V.......
2.1 21 E..V.......
2.2 22 E..V.......
3 30 E..V.......
3.0 30 E..V.......
3.1 31 E..V.......
3.2 32 E..V.......
4 40 E..V.......
4.0 40 E..V.......
4.1 41 E..V.......
4.2 42 E..V.......
5 50 E..V.......
5.0 50 E..V.......
5.1 51 E..V.......
5.2 52 E..V.......
6 60 E..V.......
6.0 60 E..V.......
6.1 61 E..V.......
6.2 62 E..V.......
-tune <int> E..V....... Video quality for different target (from -1 to 0) (default auto)
auto -1 E..V.......
psnr 0 E..V.......
-rc <int> E..V....... Override the preset rate-control (from -1 to 4) (default auto)
auto -1 E..V.......
cbr 1 E..V....... Constant bitrate mode
vbr 2 E..V....... Variable bitrate mode
crf 3 E..V....... Constant rate factor mode
constqp 4 E..V....... Constant QP mode
.......
hevc_mxenc上查看编码参数，如下所示:
ffmpeg version n4.4.3-39-g1914aedcc1-VERSION--build_data:2025-04-04_04:56:43,branch:,commit_id:1914aedcc1 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
configuration: --disable-asm --enable-metax --enable-shared --enable-cross-compile --enable-gpl --enable-libx264 --enable-libx265 --enable-libaom --enable-libdavs2 --enable-libxavs2 --enable-libopus --enable-libfreetype --enable-libvmaf --enable-version3 --enable-avresample --disable-sndio --disable-xlib --disable-alsa --disable-sdl2 --extra-version='VERSION--build_data:2025-04-04_04:56:43,branch:,commit_id:1914aedcc1' --extra-cflags=-I/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/include --extra-cflags=-I/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/include/mcr --extra-cflags=-I/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/ffmpeg/thirdparty/include --extra-ldflags=-L/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/lib --extra-ldflags=-L/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/ffmpeg/thirdparty/lib --extra-libs=-lmcruntime --extra-libs=-lmxkw --extra-libs=-lmxc-runtime64 --extra-libs=-lmcimage --prefix=/workspace/out/Release/mxc500-2.32.0.1/linux/x86_64/ffmpeg
libavutil 56. 70.100 / 56. 70.100
libavcodec 58.134.100 / 58.134.100
libavformat 58. 76.100 / 58. 76.100
libavdevice 58. 13.100 / 58. 13.100
libavfilter 7.110.100 / 7.110.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
libpostproc 55. 9.100 / 55. 9.100
Encoder hevc_mxenc [METAX VPUE HEVC encoder]:
General capabilities: delay hardware
Threading capabilities: none
Supported hardware devices: metax metax
Supported pixel formats: yuv420p yuv420p10le nv12 p010le metax
hevc_mxenc AVOptions:
-preset <int> E..V....... Set the encoding preset (from 0 to 5) (default fast)
veryfast 0 E..V.......
faster 1 E..V.......
fast 2 E..V.......
medium 3 E..V.......
slow 4 E..V.......
slower 5 E..V.......
-profile <int> E..V....... Set the encoding profile (from -1 to 3) (default auto)
auto -1 E..V.......
main 0 E..V.......
mainstillpicture 1 E..V.......
main10 2 E..V.......
rext 3 E..V.......
-level <int> E..V....... Set the encoding level restriction (from -1 to 186) (default auto)
auto -1 E..V.......
1 30 E..V.......
1.0 30 E..V.......
2 60 E..V.......
2.0 60 E..V.......
2.1 63 E..V.......
3 90 E..V.......
3.0 90 E..V.......
3.1 93 E..V.......
4 120 E..V.......
4.0 120 E..V.......
4.1 123 E..V.......
5 150 E..V.......
5.0 150 E..V.......
5.1 153 E..V.......
5.2 156 E..V.......
6 180 E..V.......
6.0 180 E..V.......
6.1 183 E..V.......
6.2 186 E..V.......
-tune <int> E..V....... Video quality for different target (from -1 to 0) (default auto)
auto -1 E..V.......
psnr 0 E..V.......
-rc <int> E..V....... Override the preset rate-control (from -1 to 4) (default auto)
auto -1 E..V.......
cbr 1 E..V....... Constant bitrate mode
vbr 2 E..V....... Variable bitrate mode
crf 3 E..V....... Constant rate factor mode
constqp 4 E..V....... Constant QP mode
.......