fix(audio_io): remove unreachable duplicate except in torchcodec probe

[Anai-Guo]

Problem

In lightx2v/utils/audio_io.py, the torchcodec import probe declares two identical except Exception handlers:

try:
    import torchcodec  # noqa: F401
except Exception:
    _TORCHAUDIO_DECODE_AVAILABLE = False
except Exception as e:                       # unreachable
    print(f"Error importing torchcodec: {e}")
    _TORCHAUDIO_DECODE_AVAILABLE = False
else:
    _TORCHAUDIO_DECODE_AVAILABLE = True

Two handlers for the same exception type in one try are evaluated top-down, so the first (silent) handler always wins and the second — the one that actually logs why the probe failed — is unreachable dead code.

Fix

Drop the redundant silent handler and keep the informative one, so an import failure is reported instead of swallowed:

try:
    import torchcodec  # noqa: F401
except Exception as e:
    print(f"Error importing torchcodec: {e}")
    _TORCHAUDIO_DECODE_AVAILABLE = False
else:
    _TORCHAUDIO_DECODE_AVAILABLE = True

One-hunk change; behavior on success is unchanged, and a failing probe now surfaces the underlying error.

🤖 Generated with Claude Code