为什么采样出来的视频是倒放的？

[jimmysue]

下载了 1.3 版本的模型，使用 opensora/sample/sample.py 进行采样， 出来的结果是倒放的为什么？

下面是一个生成的例子：

EulerAncestralDiscrete_1_gs7.5_s100.mp4

下面是我运行的参数配置：

 "--master_port", "29514",
                "--nnode", "1",
                "--nproc_per_node", "1", 
                "opensora/sample/sample.py",
                "--model_path", "/root/sjz/github/Open-Sora-Plan/ckpts/any93x640x640",
                "--version", "v1_3",
                "--num_frames", "93",
                "--height", "352",
                "--width", "640",
                "--cache_dir", "/root/sjz/github/Open-Sora-Plan/ckpts",
                "--text_encoder_name_1", "/root/sjz/github/Open-Sora-Plan/ckpts/mt5-xxl",
                "--text_prompt", "examples/sora.txt",
                "--ae", "WFVAEModel_D8_4x8x8",
                "--ae_path", "/root/sjz/github/Open-Sora-Plan/ckpts/vae",
                "--save_img_path", "./train_1_3_nomotion_fps18",
                "--fps", "18",
                "--guidance_scale", "7.5",
                "--num_sampling_steps", "100",
                "--max_sequence_length", "512",
                "--sample_method", "EulerAncestralDiscrete",
                "--seed", "1234",
                "--num_samples_per_prompt", "1",
                "--rescale_betas_zero_snr",
                "--prediction_type", "v_prediction"

[NevSNev]

所以是为什么呢？