使用ffmpeg，ffprobe或rvideo在ruby脚本中获取视频元数据

Question

I want to get metadata of videos referenced by a URL using Ruby. At this point, I found many related posts, but could not find out how to solve my problem.

I tried to use RVideo, but when I do:

file = RVideo::Inspector.new(:file => 'http://www.agreatsite.com/avideo.mp4')

It throws

'ArgumentError: File not found (http://www.agreatsite.com/avideo.mp4)...

So I can't get the information using RVideo (but it works well when I have the file hosted on my local computer).

I then tried to use ffprobe, but I don't know how to read the output. So far, I have the following method, which "shows" the information I want when I run it in the console, but it actually returns "true" and I can't find out how to capture the output I need...

  def media_info source = self command = <<-end_command ffprobe -v quiet -print_format json -show_format -show_streams #{source} end_command command.gsub!(/\\s+/, " ") system(command) end 

Would love some help, to make this work with either ffprobe or RVideo!

UPDATE: I found a way to get what I needed. Not sure this is the best way to do it:

def get_media_duration

 source = self.media[0][:url] command = <<-end_command ffprobe -v quiet -show_streams #{source} end_command command.gsub!(/\\s+/, " ") duration = "" IO.popen(command) { |io| while (line = io.gets) do puts "++ "+line.inspect duration = line.split("duration=")[1].gsub("\\n", "") if line.split("duration=").length > 1 end } duration 

end

I guess I could make it work that way, but doesn't seem very elegant to me. Better suggestions would be greatly appreciated!

Answer 1

Check streamio-ffmpeg, If you are still looking for a solution. Also ffprobe supports json format now: ffprobe -print_format json -show_streams #{input_file}