[Libav-user] could not open camera use qtkit on the macOS

[arsee]

Hi all,
I am getting these messages when I exec "ffmpeg -f qtkit -i "0" out.mpg" on the terminal:
Mac-mini-2:~ infowarelab-macmini$ ffmpeg -f qtkit -i "0" out.mpg
ffmpeg version 3.1.2 Copyright (c) 2000-2016 the FFmpeg developers
  built with Apple LLVM version 7.3.0 (clang-703.0.31)
  configuration: --enable-shared --disable-yasm
  libavutil      55. 28.100 / 55. 28.100
  libavcodec     57. 48.101 / 57. 48.101
  libavformat    57. 41.100 / 57. 41.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 47.100 /  6. 47.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  1.100 /  2.  1.100
[qtkit @ 0x7fc35f000000] Could not find codec parameters for stream 0 (Unknown: none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, qtkit, from '0':
  Duration: N/A, start: 2.020000, bitrate: N/A
    Stream #0:0: Unknown: none
Output #0, mpeg, to 'out.mpg':
Output file #0 does not contain any stream
The macOS version is 10.12.
Where is the problem?
Regards,Arsee
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