Windows: torchcodec conflicts with PyTorch 2.5+ (flex_attention missing vs DLL load failure)

[thomjess303]

Hi,

I'm trying to run sam-audio on Windows 11 with CUDA 12.1.

There appears to be a dependency conflict between torchcodec and newer versions of PyTorch.

Environment:

• Windows 11
• Python 3.11
• CUDA 12.1
• FFmpeg 8.0.1 (installed and on PATH)

Issue 1:
torchcodec 0.10.0 fails to load with PyTorch 2.5.1:
OSError: [WinError 127] The specified procedure could not be found
libtorchcodec_core8.dll failed to load

Issue 2:
Downgrading to PyTorch 2.4.1 resolves torchcodec,
but then sam-audio fails with:
ModuleNotFoundError: No module named 'torch.nn.attention.flex_attention'

That module exists only in PyTorch 2.5+.

So currently:

• torchcodec works with PyTorch 2.4
• sam-audio requires PyTorch 2.5+
• Both cannot coexist on Windows

Workaround:
Installing PyTorch 2.5.1 and reinstalling sam-audio with:
pip install -e . --no-deps

This bypasses torchcodec and allows import to proceed.

Is torchcodec required on Windows, or can it be removed from required dependencies?

[abhinavvinodabd]

HI, Did the approach worked ?
Did you able to run that. I'm also stuck on the same problem.