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ffmpeg 过滤器图描述中的流说明符“：a”与静音音频的流不匹配

tag-icon • tag-icon ffmpeg
ffmpeg 过滤器图描述中的流说明符“：a”与静音音频的流不匹配

对于音频已静音的视频，我收到错误消息“流说明符‘:a’在过滤器图描述中”。我该如何检测无法指定音频流的此类视频？

命令 ： ' ffmpeg -i background.mp4 -i video.mp4 -filter_complex "[0:v] [0:a] [1:v] [1:a] concat=n=2:v=2:a=2[v][a]" -map "[v]" -map "[a]" joined.mp4'

输出 ： ' Stream specifier ':a' in filtergraph description [0:v] [0:a] [1:v] [1:a] concat=n=2:v=2:a=2[v][a] matches no streams.'

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'background.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2021-11-19T07:07:21.000000Z
  Duration: 00:00:14.98, start: 0.000000, bitrate: 1140 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 1008 kb/s, 30 fps, 30 tbr,
15360 tbn (default)
    Metadata:
      creation_time   : 2021-11-19T07:07:21.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 11/18/2021.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      creation_time   : 2021-11-19T07:07:21.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 11/18/2021.
      vendor_id       : [0][0][0][0]

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