[Python] ValueError: No valid stream found in input file. Is -1 of the desired media type?

While using torchcodec with the following code

import torchcodec
file_path = "/path/to/episode_000000.mp4"
x = torchcodec.decoders.VideoDecoder(file_path, seek_mode="approximate")


I got the following error:

[rank0]: File "/home/hzxie/Applications/miniconda3/envs/lerobot/lib/python3.10/site-packages/torch/utils/data/dataloader.py", line 764, in _next_data
[rank0]: data = self._dataset_fetcher.fetch(index) # may raise StopIteration
[rank0]: File "/home/hzxie/Applications/miniconda3/envs/lerobot/lib/python3.10/site-packages/torch/utils/data/_utils/fetch.py", line 52, in fetch
[rank0]: data = [self.dataset[idx] for idx in possibly_batched_index]
[rank0]: File "/home/hzxie/Applications/miniconda3/envs/lerobot/lib/python3.10/site-packages/torch/utils/data/_utils/fetch.py", line 52, in <listcomp>
[rank0]: data = [self.dataset[idx] for idx in possibly_batched_index]
[rank0]: File "/home/hzxie/Development/vla/utils/datasets.py", line 214, in __getitem__
[rank0]: else self._get_episode(ep_idx)
[rank0]: File "/home/hzxie/Development/vla/utils/datasets.py", line 192, in _get_episode
[rank0]: episode[video_key] = self._get_video_bytes(ep_idx, video_key)
[rank0]: File "/home/hzxie/Development/vla/utils/datasets.py", line 202, in _get_video_bytes
[rank0]: x = torchcodec.decoders.VideoDecoder(vbytes)
[rank0]: File "/home/hzxie/Applications/miniconda3/envs/lerobot/lib/python3.10/site-packages/torchcodec/decoders/_video_decoder.py", line 98, in __init__
[rank0]: core.add_video_stream(
[rank0]: File "/home/hzxie/Applications/miniconda3/envs/lerobot/lib/python3.10/site-packages/torch/_ops.py", line 723, in __call__
[rank0]: return self._op(*args, **kwargs)
[rank0]: ValueError: No valid stream found in input file. Is -1 of the desired media type?


How to solve this problem?

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