// check if segment ready
// *STAGE* 4 for transcoding
// filepathname : segment filename, the format is xxx.mkv_1920x1080-3.ts, base on media_file_path_symlink_name
// return : >=0 for ok, failed otherwisecurl --location '/web/status?video_name=%2Fhome%2Fugreen%2F%E4%BA%BA%E7%94%9F%E8%B7%AF%E4%B8%8D%E7%86%9F.mp4'{}