JoyAI-Echo

JoyAI-Echo is JD.com's open release for generating long video with synced audio from a text prompt. Not the usual five-second clip. It targets multi-shot sequences up to about five minutes and keeps the same character and voice consistent across shots. The weights are actually released, not just a paper and a demo page, which is the difference between a real tool and a press release.

The catch arrives fast on hardware. You're looking at roughly 46GB of VRAM for the full setup and around 70GB of weights to download. That's an H100 or A100, data-center territory. There are reduced settings for smaller cards, with the obvious tradeoffs in quality and length.

Read the license before you build anything on this. It ships under the LTX-2 Community License, which forbids commercial use. So it substitutes for Sora, Runway, Kling, and Veo for research, prototyping, and personal projects, but not for anything you plan to sell. For commercial long-form video you're back to the paid services, or to a permissively licensed model like the Wan and Hunyuan families.

Between a non-commercial license and data-center GPU requirements, this is a research showcase for most people, not a production tool. Impressive that it exists and runs. Just know what you can and can't do with it.