如何在叠加 ffmpeg 命令中包含音频？

如何解决如何在叠加 ffmpeg 命令中包含音频？

使用 ffmpeg 我在原始视频上成功添加了视频覆盖（原始有音频，覆盖没有）。但是原始视频的音频不会出现在结果视频中。

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即使我对上一个命令的结果执行以下单独的命令 - 新的结果视频中仍然没有音频出现。

  ffmpeg  -i source.mp4 -i overlay.mp4 -filter_complex "[0:v]setpts=PTS-STARTPTS,scale=1280x720[top]; 
  [1:v]setpts=PTS-STARTPTS,scale=1280x720,format=yuva420p,colorchannelmixer=aa=0.2[bottom]; [top][bottom]overlay=shortest=1" 
  -shortest -acodec copy -vcodec libx264 result1.mp4

这是日志：

  ffmpeg -i result1.mp4 -i audio.mp3 -c:v copy -c:a aac result2.mp4

解决方法

用 -map 告诉它您想要哪种音频：

ffmpeg -i source.mp4 -i overlay.mp4 -filter_complex "[0:v]setpts=PTS-STARTPTS,scale=1280x720[top]; 
  [1:v]setpts=PTS-STARTPTS,scale=1280x720,format=yuva420p,colorchannelmixer=aa=0.2[bottom]; [top][bottom]overlay=shortest=1[v]" 
  -map "[v]" -map 0:a -shortest -acodec copy -vcodec libx264 result1.mp4

• 见FFmpeg Wiki: Map。
• 您的原始命令未使用 -map，因此启用了 automatic stream selection。这将选择通道最多的流，即来自 overlay.mp4（流 #1:1）的音频。