[mutagen]

I suspect some implementation issues rather than a GFY attitude, it doesn't work on FF or Chrome on OSX 10.9. Safari works though.

[xooyoozoo]

I recall reading on gfycat's subreddit that desktop Chrome's H264 support is occasionally spotty, so they chose to force on VP8/WebM in Chrome.

The upside is that users get a reliable experience. the downside is that laptop Chrome users get a reliably lower battery life, as VP8 isn't typically hardware accelerated.

[chc]

I'm looking at it right now in Chrome on Mavericks. Are you sure you checked with the right browser?

[adregan]

I'm using Chrome 35 on Mavericks and I also get the message. Clicking through to Twitter will display the video.

[CountSessine]

Chrome on OSX 10.9 works just fine. I'm looking at the example video now.