ffmpeg.worker

# declare stack
stack "ffmpeg-2.3"
# this is the important part that will include ffmpeg-2.3 gpac 0.51
# OS - Ubuntu 12.04.5 
# check out all the installed libraries on this stack here 

# declare runtime to use
runtime "ruby" 
# declare a runtime our FFMPEG stack supports
# -Python
# -Node
# -Ruby
# -Php
# -Binary (run a shell script)

# declare a executable that will do your video processing
exec "optimize_video.rb"

transcode.rb

movie = FFMPEG::Movie.new("https://archive.org/download/LeafroyaltyFreeStockVideo/Leaf.mp4")

movie.duration # 7.5 (duration of the movie in seconds)
movie.bitrate # 481 (bitrate in kb/s)
movie.size # 455546 (filesize in bytes)

movie.video_stream # "h264, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 371 kb/s, 16.75 fps, 15 tbr, 600 tbn, 1200 tbc" (raw video stream info)
movie.video_codec # "h264"
movie.colorspace # "yuv420p"
movie.resolution # "640x480"
movie.width # 640 (width of the movie in pixels)
movie.height # 480 (height of the movie in pixels)
movie.frame_rate # 16.72 (frames per second)

movie.audio_stream # "aac, 44100 Hz, stereo, s16, 75 kb/s" (raw audio stream info)
movie.audio_codec # "aac"
movie.audio_sample_rate # 44100
movie.audio_channels # 2

movie.valid?