Added an enhancement request, issue 1064[1], to github, asking for the clients to support longer audio clips.

I can't promise when we'll get to it, as from now until new year is a bit of a wash.

I don't know of any detailed comparisons of commercial solutions. However, with respect to pure word error rate, the article[2] does a comparison of several engines as of circa 2015.

[1] https://github.com/mozilla/DeepSpeech/issues/1064

[2] https://arxiv.org/abs/1412.5567