问人脸检索,base64图片,图片解码失败,为啥？？？？？

String base64 = ArcFaceManager.getFirstBase64();
client =  baseRetrofit.getOkHttpClient();
RequestBody rb = create(MediaType.parse("image/jpeg"), base64);//"data:image/jpg;base64,"+
RequestBody requestBody = new MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("appid", FaceContants.APP_ID+"")
        .addFormDataPart("group_id", FaceContants.GROUP_IDS)
        .addFormDataPart("image", "test.jpg",rb)
        .build();

final Request request = new Request.Builder()
        .header("Authorization", FaceContants.getAuthorization())
        .url("http://recognition.image.myqcloud.com/face/identify")
        .post(requestBody)
        .build();