People watch livestreams to connect with others and learn about their hobbies. Livestreams feature multiple visual streams including the main video, webcams, on-screen overlays, and chat, all of which are inaccessible to livestream viewers with visual impairments. While prior work explores creating audio descriptions for recorded videos, live videos present new challenges: authoring descriptions in real-time, describing domain-specific content, and prioritizing which complex visual information to describe. We explore inviting livestream community members who are domain experts to provide live descriptions. We first conducted a study with 18 sighted livestream community members authoring descriptions for livestreams using three different description methods: live descriptions using text, live descriptions using speech, and asynchronous descriptions using text. We then conducted a study with 9 livestream community members with visual impairments, who shared their current strategies and challenges for watching livestreams and provided feedback on the community-written descriptions. We conclude with implications for improving the accessibility of livestreams.

翻译：人们观看直播以与他人交流并学习兴趣爱好。直播包含多个视觉流，包括主视频、网络摄像头、屏幕叠加画面和聊天内容，这些对视力障碍的直播观众均不可访问。虽然先前的研究探索为录播视频创建音频描述，但直播视频面临新挑战：实时编写描述、描述领域特定内容，以及优先选择哪些复杂视觉信息进行描述。我们探索邀请具有领域专业知识的直播社区成员提供实时描述。首先，我们与18名视力正常的直播社区成员开展研究，他们使用三种不同描述方法为直播编写描述：文本实时描述、语音实时描述和文本异步描述。随后，我们与9名视力障碍的直播社区成员进行研究，他们分享了当前观看直播的策略与挑战，并对社区编写的描述提供反馈。最后，我们得出提升直播可访问性的启示。