ffmpeg

g729 to wav 

 ffmpeg -f g729 -i "C:\Video\wav\123.g729" -f wav "C:\Video\wav\123.wav" 

 avi to mov с использованием GPU 

 ffmpeg -i video.avi -c:v h264_nvenc -preset p7 -pix_fmt yuv420p -an test.mov

 50\50 CPU и GPU

ffmpeg -hwaccel cuda -c:v h264_cuvid -i input.avi -c:v h264_nvenc -preset p7 -pix_fmt yuv420p -an output.mov

100% GPU 

 mov to mov  

 ffmpeg -hwaccel cuvid -i input.mov -c:v h264_nvenc -bsf:v h264_mp4toannexb -b:v 5M -c:a copy output.mov 

 100%GPU