(自分用メモ) ffmpeg

ffmpegをmacで使った時のメモ書き (Linuxのほうが使いやすい気がする)

インストール

• brewにて
  • $brew install ffmpeg

使い方

• 使用可能なvideo resource一覧の表示
  • e.g. Macのフロントカメラは "[0] FaceTime HD Camera"
  • [メモ] Macの場合はavfoundationが必要らしい. Ubuntuでは不要だったなぁ
    • https://www.ffmpeg.org/ffmpeg-devices.html#avfoundation

➜  ✗ ffmpeg -f avfoundation -list_devices true -i ""

ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gpl --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-opencl --enable-videotoolbox
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
[AVFoundation input device @ 0x7ffa3f402b40] AVFoundation video devices:
[AVFoundation input device @ 0x7ffa3f402b40] [0] FaceTime HD Camera
[AVFoundation input device @ 0x7ffa3f402b40] [1] Capture screen 0
[AVFoundation input device @ 0x7ffa3f402b40] [2] Capture screen 1
[AVFoundation input device @ 0x7ffa3f402b40] AVFoundation audio devices:
[AVFoundation input device @ 0x7ffa3f402b40] [0] Built-in Microphone

• Camera viewの表示
  • $ffplay -f avfoundation -framerate 30 -i "0"
  • [注意] framerateが必要
    • (参考) https://stackoverflow.com/questions/37960828/webcam-streaming-from-mac-using-ffmpeg

参考

• ffmpeg (API)を用いてWebカメラからキャプチャ
  • https://qiita.com/gwappa/items/d4adc9354fab3fa2c1c9