CheckTaskComplete checks if a task has completed.

CheckTaskExist checks if a task exists in the database.

CheckTaskStart checks if a task has started.

CheckVideoExist 检查视频记录是否存在.

DeleteTask deletes a task from the database.

DeleteVideoClips 删除所有视频切片.

GetTask gets a completed Task from the database.

GetVideoClip 获取视频切片信息.

GetVideoClips 获取所有视频切片信息，按照索引排序.

GetVideoProgress 获取视频处理进度和每个切片的状态.

InsertTask inserts a new uncompleted task into the database.

InsertVideo 插入视频信息.

ListTask list all tasks in the database.

UnsetTaskEncodeKey 清除任务的 EncodeKey.

UnsetVideoClipEncodeKey 清除视频切片的编码键.

UpdateTask updates an uncompleted task in the database.

UpdateVideoClip 更新视频信息.