llogan
2020-12-03 05:26:28
添加adelay过滤器：
ffmpeg -y -i stream1.mp4 -i stream2.mp4 \
-filter_complex "[1:v]setpts=PTS+5/TB[v]; \
[0:v][v]overlay=enable=gte(t\,5):shortest=1,format=yuv420p[out]; \
[1:a]adelay=5s:all=1[a1];[0][a1]amix[a]" \
-map [out] -map [a] \
-c:v libx264 -crf 18 \
output.mp4
如果你ffmpeg已过时，则必须使用毫秒，并为每个通道声明延迟，例如adelay=5000|5000。
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