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ffmpeg command wiki | hwaccel HWAccelIntro

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FFmpeg Command wiki

HWAccel 硬件加速相关

FFmpeg HWAccel

1. 枚举 ffmpeg 硬件加速能力

   ffmpeg -hwaccels

   Hardware acceleration methods:

   cuda

   dxva2

   qsv

   d3d11va

   opencl

   vulkan

   查看支持的所有编码器

   ffmpeg -encoders

   查看支持的所有解码器

   ffmpeg -decoders

2. 使用以上这些hw硬解视频，测试一个1分钟的MP4文件解码和编码。

   显卡：NVIDIA GTX1660ti

   CPU：Intel(R) Core(TM) i5-9400 CPU @ 2.90GHz

   系统：Win10

   ---

   单纯解码测试

   ffmpeg.exe -hwaccel dxva2 -i input.mp4 -f null -

   dxva2 hwaccel spent = 5.09 s

   ffmpeg.exe -hwaccel d3d11va -i input.mp4 -f null -

   d3d11va hwaccel spent = 5.62 s

   ffmpeg.exe -hwaccel cuda -i input.mp4 -f null -

   cuda hwaccel spent = 4.35 s

   ffmpeg.exe -hwaccel cuvid -i input.mp4 -f null -

   cuvid hwaccel spent = 3.50 s

   ffmpeg.exe -hwaccel qsv -i input.mp4 -f null -

   qsv hwaccel spent = 2.29 s

   ffmpeg.exe -hwaccel opencl -i input.mp4 -f null -

   opencl hwaccel spent = 2.55 s

   ffmpeg.exe -hwaccel vulkan -i input.mp4 -f null -

   vulkan hwaccel spent = 3.09 s

   HWAccell	TimeSpent(s)
   dxva2	5.09
   d3d11va	5.62
   cuda	4.35
   cuvid	3.50
   qsv	2.29
   opencl	2.55
   vulkan	3.09

   ---

   硬解 + 硬编测试

   ffmpeg.exe -hwaccel dxva2 -i input.mp4 -f mp4 -c:v h264_nvenc -b:v 2000k -y NUL

   dxva2 decoder | h264_nvenc encoder spent = 8.04 s

   ffmpeg.exe -hwaccel d3d11va -i input.mp4 -f mp4 -c:v h264_nvenc -b:v 2000k -y NUL

   d3d11va decoder | h264_nvenc encoder spent = 8.66 s

   ffmpeg.exe -hwaccel cuda -i input.mp4 -f mp4 -c:v h264_nvenc -b:v 2000k -y NUL

   cuda decoder | h264_nvenc encoder spent = 7.27 s

   ffmpeg.exe -c:v h264_cuvid -i input.mp4 -f mp4 -c:v h264_nvenc -b:v 2000k -y NUL

   cuvid decoder | h264_nvenc encoder spent = 5.79 s

   ffmpeg.exe -hwaccel qsv -i input.mp4 -f mp4 -c:v h264_nvenc -b:v 2000k -y NUL

   qsv decoder | h264_nvenc encoder spent = 5.78 s

   ffmpeg.exe -hwaccel opencl -i input.mp4 -f mp4 -c:v h264_nvenc -b:v 2000k -y NUL

   opencl decoder | h264_nvenc encoder spent = 5.89 s

   ffmpeg.exe -hwaccel vulkan -i input.mp4 -f mp4 -c:v h264_nvenc -b:v 2000k -y NUL

   vulkan decoder | h264_nvenc encoder spent = 6.36 s

   ffmpeg.exe -hwaccel qsv -i input.mp4 -f mp4 -c:v libx264 -b:v 2000k -y NUL

   qsv decoder | libx264 encoder spent = 40.62 s

   ffmpeg.exe -i input.mp4 -f mp4 -c:v libx264 -b:v 2000k -y NUL

   h264 cpu | libx264 encoder spent = 40.36 s

   HWAccell	encoder	TimeSpent(s)
   dxva2	h264_nvenc	7.46
   d3d11va	h264_nvenc	7.56
   cuda	h264_nvenc	6.49
   cuvid	h264_nvenc	5.76
   qsv	h264_nvenc	5.78
   opencl	h264_nvenc	5.89
   vulkan	h264_nvenc	6.36
   qsv	libx264	37.62
   h264 cpu	libx264	37.55

   硬解测试 Python脚本 [Python3]

   ffmpeg-hw.py

视频添加图片水印和背景音乐

添加图片水印主要使用的video filter的功能，参考：FilteringGuide

Python脚本 [Python3]

watermark.py