本文共 2484 字，大约阅读时间需要 8 分钟。

• 下载ffmpeg源码

git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg/

• 安装依赖包：

sudo apt-get install build-essential yasm cmake libtool libc6 libc6-dev unzip wget libnuma1 libnuma-dev

• 编译配置

./configure --enable-nonfree -–enable-cuda-sdk –enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64

• 编译

make -j 8

• 安装

sudo make install

• 同分辨率转码, gpu加速转码，ddr在线模式

ffmpeg -y -vsync 0 -hwaccel cuvid -c:v h264_cuvid -i input.mp4 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4

• 变分辨率转码：

ffmpeg -y -vsync 0 -hwaccel cuvid –resize 1280x720 -c:v h264_cuvid -i input.mp4 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4

• corp转码 (-crop (top)x(bottom)x(left)x(right))

ffmpeg -y -vsync 0 -hwaccel cuvid –crop 16x16x32x32 -c:v h264_cuvid -i input.mp4 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4

• scale_cuda filter 转码

ffmpeg -y -vsync 0 -hwaccel cuvid -c:v h264_cuvid -i input.mp4 -vf scale_cuda=1280:720 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4

• scale_npp filter 转码

ffmpeg -y -vsync 0 -hwaccel cuvid -c:v h264_cuvid -i input.mp4 -vf scale_npp=1280:720 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4

• 1:N 转码

ffmpeg -y -vsync 0 -hwaccel cuvid -c:v h264_cuvid -i input.mp4 -vf scale_npp=1920:1080 -c:a copy -c:v h264_nvenc -b:v 5M output1.mp4 -vf scale_npp=1280:720 -c:a copy -c:v h264_nvenc -b:v 8M output2.mp4

• yuv编码, 1:N 编码

ffmpeg -y -vsync 0 -pix_fmt yuv420p -s 1920x1080 -i input.yuv -filter_complex "[0:v]hwupload_cuda,split=4[o1][o2][o3][o4]" -map "[o1]" -c:v h264_nvenc -b:v 8M output1.mp4 -map "[o2]" -c:v h264_nvenc -b:v 10M output2.mp4 -map "[o3]" -c:v h264_nvenc -b:v 12M output3.mp4 -map "[o4]" -c:v h264_nvenc -b:v 14M output4.mp4

• 转码, 1:N 编码

ffmpeg -y -hwaccel cuvid –c:v h264_cuvid -i input1.mp4 -hwaccel cuvid –c:v h264_cuvid -i input2.mp4 -map 0:0 -vf scale_npp=640:480 –c:v h264_nvenc -b:v 1M output11.mp4 -map 0:0 -vf scale_npp=320:240 –c:v h264_nvenc -b:v 500k output12.mp4 -map 1:0 -vf scale_npp=1280:720 –c:v h264_nvenc -b:v 3M output21.mp4 -map 1:0 -vf scale_npp=640:480 –c:v h264_nvenc -b:v 2M output22.mp4

• 软解码，gpu resize，gpu编码

ffmpeg -y -init_hw_device cuda=foo:bar -filter_hw_device foo  -i input1.mp4 -i input2.mp4 -map 0:0 -vf hwupload,scale_npp=640:480 –c:v h264_nvenc -b:v 1M  output11.mp4 -map 0:0 -vf hwupload,scale_npp=320:240 –c:v h264_nvenc -b:v 500k  output12.mp4 -map 1:0 -vf hwupload,scale_npp=1280:720 –c:v h264_nvenc -b:v 2M output21.mp4 -map 1:0 -vf hwupload,scale_npp=640:480 –c:v h264_nvenc -b:v 1M output22.mp4

更多配置通过ffmpeg查看NVIDIA编码器和解码器属性配置

更多参考：

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