Merge pull request #2 from pskupinski/master

Add useful metadata that is currently ignored to metadata output
Merge pull request #3 from pskupinski/master

support custom arguments that don't have values
Documented the custom function.
Bumped version to 0.0.4.
Update transcoder.js

Set the ffmpeg binary path by envar, let 'ffmpeg' by default
Update README.md

ENV VAR path.
???, wtf github
Merge pull request #6 from gorghoa/master

Make the ffmpeg path configurable
refine the progress event regex.

As when transcoding audio files, it seems that there is no “frame=” but a “size=”. perhaps depending on ffmpeg version though (using 2.3.1).
Merge pull request #7 from gorghoa/master

refine the progress event regex.
Bumped version to 0.0.5.