ffmpeg 合并 MP4和MP3文件

ffmpeg -i 'hhl2.mp4'  -i 'hhl.wav' -c:v copy -c:a aac -strict experimental -map 0:v:0 -map 1:a:0 hhl-audio.mp4


必须指定映射的输入流：
You'll have to map the input streams:

ffmpeg -i video.mp4 -i genaudio.mp3 -map 0:v -map 1:a -c:v copy -c:a copy output.mp4 -y

当输入的内容有多个同类型的streams时候， ffmpeg会找‘最好’的那个。audio就是最多数的频道。如果他们是相同的，它会找最早输入的stream.
When the inputs have multiple streams of a type among them, ffmpeg picks the 'best' one. For audio, that's the one with most number of channels. If those are the same, then it picks a stream from the earliest input.
不需要去重新编码audio. 直接copy就行。
(No need to re-encode the audio, so I've switched to copy)

在处理mp3的时候，提示：
> ffmpeg -i shuibanwo.mp3 -c:a aac -b:a 32k output.m4a -y

Could not find tag for codec h264 in stream #0, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:1 --

通过ffmpeg查看mp3既然是 Video
hw@hw-s:~/Downloads$ ffmpeg -i music/shuibanwo.mp3
  Duration: 00:04:13.99, start: 0.025056, bitrate: 130 kb/s
  Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : LAME3.97
  Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 240x240 [SAR 1:1 DAR 1:1], 90k tbr, 90k tbn (attached pic)

下面这个mp4是audio
hw@hw-s:~/Downloads$ ffmpeg -i music/mm.mp4
  Duration: 00:00:31.48, start: -0.021333, bitrate: 131 kb/s
  Stream #0:0[0x1](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 16 kb/s (default)
    Metadata:
      handler_name    : Bento4 Sound Handler
      vendor_id       : [0][0][0][0]

所以不能被文件后缀骗了。。。
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