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有沒有人得到ffmpegthumbnailer在heroku上工作？我可以在網上找到的唯一文檔是在這裏：讓ffmpegthumbnailer在heroku上工作
Using Heroku Vulcan to build lib with dependency
而且好像它從來沒有回答。
當我嘗試安裝ffmpegthumbnailer，我得到的錯誤：
checking for FFMPEG... no
configure: error: Package requirements (libavutil libavformat libavcodec >= 52.26.0 libswscale) were not met:
No package 'libavutil' found
No package 'libavformat' found
No package 'libavcodec' found
No package 'libswscale' found
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
Alternatively, you may set the environment variables FFMPEG_CFLAGS
and FFMPEG_LIBS to avoid the need to call pkg-config.
我有安裝的ffmpeg，不過，我可以用Heroku的這FFmpeg的，它返回供應商/ ffmpeg的/ bin中檢查/ ffmpeg的
我嘗試添加的環境變量FFMPEG_CFLAGS和FFMPEG_LIBS：
FFMPEG_CFLAGS: bin:vendor/ffmpeg/include:vendor/libav/include
FFMPEG_LIBS: vendor/ffmpeg/lib:vendor/libav/lib
LD_LIBRARY_PATH: vendor/ffmpeg/lib:/usr/local/lib
PATH: bin:vendor/ffmpeg/bin:vendor/bundle/ruby/1.9.1/bin:/usr/local/bin:/usr/bin:/bin
當我安裝ffmpegthumbnailer時，如何讓我的Heroku應用識別我的ffmpeg安裝？