Chinese open-source framework targets stable 5-minute AI long-video generation

5分钟AI长视频不翻车！国产开源框架杀到全球第一梯队

JD open-sourced JoyAI-Echo, a long audio-video generation framework for 5-minute consistent videos, using cross-modal memory, DMD post-training for about 7.5x faster inference, and real-time upscaling from 720P to 1K or 2K output.

Why it matters: HKR-H/K/R all pass: the story has a clear 5-minute video hook, concrete speed and SR claims, and open-source competition resonance. Missing third-party evaluation keeps it in the lower 78–84 band.