视频转码接口,通用参数中需要签名,总是失败,https://vod.api.qcloud.com/v2/index.php?Action=ConvertVodFile&fileId=5285890782529446812&Nonce=43603&Region=bj&SecretId=AKIDISQDqIeebNyNdidT4T3WyHTTHtJXrVFs&Timestamp=1540816772&Signature=VHijmyfxKzRs8Hr%2FlbUYgJdk79E%3D
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