如何将aac添加到filter_complex/split中，以便音频仅作为yadif编码一次?
ffmpeg -y -hwaccel cuvid -i test.mxf -filter_complex "[0:v]yadif=1,split=2[out1][out2]" -map "[out1]" -s 1920:1080 -c:v h264_nvenc -force_key_frames "expr:gte(t,n_forced*10)" -pix_fmt yuv420p -preset slow -rc vbr_hq -b:v 4.5M -map 0:1 -c:a aac -b:a 192k test2.mp4 -map "[out2]" -s 768:432 -c:v h264_nvenc -force_key_frames "expr:gte(t,n_forced*10)" -pix_fmt yuv420p -preset slow -rc vbr_hq -b:v 1.5M -map 0:1 -c:a aac -b:a 192k test3.mp4
你的视频被编码两次，这是不可避免的，因为你输出两个不同的宽度x高度。每个输出的音频都是相同的，因此您可以使用tee muxer只对音频编码一次，并将其放在两个输出中:
ffmpeg -hwaccel cuvid -i test.mxf -filter_complex "[0:v]yadif=1,format=yuv420p,split=2[vid1][vid2];[vid1]scale=-2:1080[1080];[vid2]scale=-2:432[432]" -map "[1080]" -map "[432]" -map 0:a:0 -c:v h264_nvenc -force_key_frames "expr:gte(t,n_forced*10)" -preset slow -rc vbr_hq -b:v:0 4.5M -b:v:1 1.5M -c:a aac -b:a 192k -f tee "[select='v:0,a']1080.mp4|[select='v:1,a']432.mp4"