Airflow lets you watch local content on Apple TV and Chromecast with a simple drag-and-drop.

Airflow promises excellent video quality with a low CPU load by transparently remixing videos that can be remixed and transcode videos that need to be transcoded. Transcoding is hardware accelerated if your computer supports it. The goal was to do this seamlessly, so you don't have to bother.

Unlike most similar software, Airflow doesn't need to transcode video to display text subtitles. This fact results in better video quality and lower CPU load. DVD and Bluray subtitles are supported.

With instant scrubbing preview, you know where you'll land before the content loads. Also available on Apple TV 4 when scrubbing using touch remote.

Airflow lets you organize files into playlists to watch multiple episodes as seamlessly as it gets.

Airflow remembers your playback position for every file. It also watches the current folder, and for new files, automatically select 'next file' for uninterrupted playback.

Surround sound is also supported.

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Limitations:
Playback is limited to 20 minutes. $18.99 is the cost to register.