ffmpeg之枚举法设备

 ./ffmpeg -h demuxer=alsa
ffmpeg version N-93544-g0a347ff Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
  configuration: --enable-shared --prefix=./build/install --disable-x86asm --enable-pic
  libavutil      56. 26.100 / 56. 26.100
  libavcodec     58. 48.101 / 58. 48.101
  libavformat    58. 27.100 / 58. 27.100
  libavdevice    58.  7.100 / 58.  7.100
  libavfilter     7. 48.100 /  7. 48.100
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
Demuxer alsa [ALSA audio input]:
ALSA demuxer AVOptions:
  -sample_rate               .D.......  (from 1 to INT_MAX) (default 48000)
  -channels                  .D.......  (from 1 to INT_MAX) (default 2)

 

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