[直播录像可以支持下载吗](%E7%9B%B4%E6%92%AD%E5%BD%95%E5%83%8F%E5%8F%AF%E4%BB%A5%E6%94%AF%E6%8C%81%E4%B8%8B%E8%BD%BD%E5%90%97.md) [可以上传已经录制好的视频到课堂吗？支持什么格式？](%E5%8F%AF%E4%BB%A5%E4%B8%8A%E4%BC%A0%E5%B7%B2%E7%BB%8F%E5%BD%95%E5%88%B6%E5%A5%BD%E7%9A%84%E8%A7%86%E9%A2%91%E5%88%B0%E8%AF%BE%E5%A0%82%E5%90%97%EF%BC%9F%E6%94%AF%E6%8C%81%E4%BB%80%E4%B9%88%E6%A0%BC%E5%BC%8F%EF%BC%9F.md) [为什么录像的占用空间比原始文件要大？](%E4%B8%BA%E4%BB%80%E4%B9%88%E5%BD%95%E5%83%8F%E7%9A%84%E5%8D%A0%E7%94%A8%E7%A9%BA%E9%97%B4%E6%AF%94%E5%8E%9F%E5%A7%8B%E6%96%87%E4%BB%B6%E7%9A%84%E5%A4%A7%E5%B0%8F%E8%A6%81%E5%A4%A7%EF%BC%9F.md)