You can easily extract video metadata into a hash with mplayer and Ruby:
```ruby
class Metadata
def self.get(file)
command = "mplayer -vo null -ao null -frames 0 -identify #{file}"
metadata = nil
Open3.popen3(command) do |input, output, error|
metadata = output.readlines.grep(/ID_.*/).collect {|name| name[3..name.length].split('=')}
metadata = metadata.inject({}) {|hash, (key, value)| hash[key.to_sym] = value.chomp; hash}
end
return metadata
end
end
```
Then in an RSpec test do:
```ruby
it "should support 3gp" do
metadata = Metadata.get("videos/sony_ericsson_k850i.3gp")
metadata[:DEMUXER].should == 'mov'
metadata[:VIDEO_FORMAT].should == 's263'
metadata[:VIDEO_WIDTH].should == '176'
metadata[:VIDEO_HEIGHT].should == '144'
end
```
Note to self: metadata.demuxer would perhaps be a slightly better syntax.