Elmedia is multiformat player for Mac which supports almost all media formats + it has PRO version which allows downloading online videos.
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Pro Plays almost any video file
Elmedia Player is a free media player for Mac that supports various audio and video formats, including FLV, SWF, MP4, AVI, MOV, MP4, DAT, MP3, etc.
Pro Play online videos online without ads
You can open an online video with a URL and play it without Ads (like it usually happens on YouTube).
Pro Handy Open URL option
Open URL option allows watching YouTube videos without ads.
Pro Built-in web browser
The app features built-in web browser that allows you to watch online videos directly from the app, while Open URL enables you to do it without noisy ads.
Pro Convenient video settings
You can use different settings to video like video and image layout adjustments.
Pro Subtitles editing
Allows changing font, size, font color, border color, etc. Possibility to increase or decrease subtitles delay