Total frames < 0 for any matroska file (mkv/webm)

[akshaal]

ffmpeg from git
slowmoVideo from git

See https://dl.dropbox.com/u/52935113/slowmo.png

[Granjow]

Hey akshaal,
Could you please re-post this issue on the new slowmoVideo page?
https://github.com/slowmoVideo/slowmoVideo/issues
thanks!