comfyanonymous
FFmpeg extension is not available.
Custom Node Testing
- [x] I have tried disabling custom nodes and the issue persists (see how to disable custom nodes if you need help)
Expected Behavior
ComfyUI should execute successfully. Actual configurtation:
- Debian 13
- ffmpeg version 7.1.2-0+deb13u1 Copyright (c) 2000-2025 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19)
$ nvidia-smi
Wed Nov 19 17:28:15 2025
+-----------------------------------------------------------------------------------------+ | NVIDIA-SMI 580.105.08 Driver Version: 580.105.08 CUDA Version: 13.0 | +-----------------------------------------+------------------------+----------------------+ | GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC | | Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. | | | | MIG M. | |=========================================+========================+======================| | 0 NVIDIA GeForce RTX 3060 On | 00000000:02:00.0 Off | N/A | | 0% 43C P8 18W / 170W | 217MiB / 12288MiB | 0% Default | | | | N/A | +-----------------------------------------+------------------------+----------------------+ | 1 Quadro P4000 On | 00000000:03:00.0 Off | N/A | | 46% 30C P8 5W / 105W | 5MiB / 8192MiB | 0% Default | | | | N/A | +-----------------------------------------+------------------------+----------------------+
Actual Behavior
the execution stops right after : Using pytorch attention
Steps to Reproduce
$ comfy launch
Debug Logs
$comfy launch -- --verbose
Launching ComfyUI from: /home/near/git/ComfyUI
[START] Security scan
[DONE] Security scan
Popen(['git', 'version'], cwd=/home/near/git/ComfyUI, stdin=None, shell=False, universal_newlines=False)
Popen(['git', 'version'], cwd=/home/near/git/ComfyUI, stdin=None, shell=False, universal_newlines=False)
## ComfyUI-Manager: installing dependencies done.
** ComfyUI startup time: 2025-11-19 17:25:13.524
** Platform: Linux
** Python version: 3.13.5 (main, Jun 25 2025, 18:55:22) [GCC 14.2.0]
** Python executable: /home/near/git/comfy-env/bin/python3
** ComfyUI Path: /home/near/git/ComfyUI
** ComfyUI Base Folder Path: /home/near/git/ComfyUI
** User directory: /home/near/git/ComfyUI/user
** ComfyUI-Manager config path: /home/near/git/ComfyUI/user/default/ComfyUI-Manager/config.ini
** Log path: /home/near/git/ComfyUI/user/comfyui.log
Prestartup times for custom nodes:
1.8 seconds: /home/near/git/ComfyUI/custom_nodes/ComfyUI-Manager
Checkpoint files will always be loaded safely.
Total VRAM 11908 MB, total RAM 7854 MB
pytorch version: 2.6.0+cu124
Set vram state to: NORMAL_VRAM
Device: cuda:0 NVIDIA GeForce RTX 3060 : cudaMallocAsync
Enabled pinned memory 7461.0
Using pytorch attention
Loading FFmpeg6
Failed to load FFmpeg6 extension.
Traceback (most recent call last):
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 116, in _find_ffmpeg_extension
ext = _find_versionsed_ffmpeg_extension(ffmpeg_ver)
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 108, in _find_versionsed_ffmpeg_extension
_load_lib(lib)
~~~~~~~~~^^^^^
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 94, in _load_lib
torch.ops.load_library(path)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torch/_ops.py", line 1357, in load_library
ctypes.CDLL(path)
~~~~~~~~~~~^^^^^^
File "/usr/lib/python3.13/ctypes/__init__.py", line 390, in __init__
self._handle = _dlopen(self._name, mode)
~~~~~~~^^^^^^^^^^^^^^^^^^
OSError: libavutil.so.58: cannot open shared object file: No such file or directory
Loading FFmpeg5
Failed to load FFmpeg5 extension.
Traceback (most recent call last):
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 116, in _find_ffmpeg_extension
ext = _find_versionsed_ffmpeg_extension(ffmpeg_ver)
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 108, in _find_versionsed_ffmpeg_extension
_load_lib(lib)
~~~~~~~~~^^^^^
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 94, in _load_lib
torch.ops.load_library(path)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torch/_ops.py", line 1357, in load_library
ctypes.CDLL(path)
~~~~~~~~~~~^^^^^^
File "/usr/lib/python3.13/ctypes/__init__.py", line 390, in __init__
self._handle = _dlopen(self._name, mode)
~~~~~~~^^^^^^^^^^^^^^^^^^
OSError: libavutil.so.57: cannot open shared object file: No such file or directory
Loading FFmpeg4
Failed to load FFmpeg4 extension.
Traceback (most recent call last):
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 116, in _find_ffmpeg_extension
ext = _find_versionsed_ffmpeg_extension(ffmpeg_ver)
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 108, in _find_versionsed_ffmpeg_extension
_load_lib(lib)
~~~~~~~~~^^^^^
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 94, in _load_lib
torch.ops.load_library(path)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torch/_ops.py", line 1357, in load_library
ctypes.CDLL(path)
~~~~~~~~~~~^^^^^^
File "/usr/lib/python3.13/ctypes/__init__.py", line 390, in __init__
self._handle = _dlopen(self._name, mode)
~~~~~~~^^^^^^^^^^^^^^^^^^
OSError: libavutil.so.56: cannot open shared object file: No such file or directory
Loading FFmpeg
Failed to load FFmpeg extension.
Traceback (most recent call last):
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 116, in _find_ffmpeg_extension
ext = _find_versionsed_ffmpeg_extension(ffmpeg_ver)
File "/home/near/git/comfy-env/lib/python3.13/site-packages/torio/_extension/utils.py", line 106, in _find_versionsed_ffmpeg_extension
raise RuntimeError(f"FFmpeg{version} extension is not available.")
RuntimeError: FFmpeg extension is not available.
Other
No response
A very strange situation. @silveroxides brought a PR https://github.com/comfyanonymous/ComfyUI/pull/6870 that supposedly fixed this, but as far as I understand, there was no reviewer. For some reason, the PR was closed without merging the changes.
Update: I tried this fix and it didn't help. Probably because I already have ffmpeg7. And it might not be in the PATH.
So, torchaudio already has this code from the fix: https://github.com/pytorch/audio/blob/main/src/torchaudio/_extension/utils.py#L103-L115
And torio has been moved to TorchCodec https://github.com/pytorch/audio/issues/3902 (latest TorchAudio 2.9) Where the same problems appear: https://github.com/meta-pytorch/torchcodec/issues/1023
In the end, updating in Torch to 2.9.1 and updating its dependencies to newer versions helped me. At least it found ffmpeg7.
Loading FFmpeg6 Failed to load FFmpeg6 extension. Traceback (most recent call last): File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 116, in _find_ffmpeg_extension ext = _find_versionsed_ffmpeg_extension(ffmpeg_ver) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 108, in _find_versionsed_ffmpeg_extension _load_lib(lib) File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 94, in load_lib torch.ops.load_library(path) File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torch_ops.py", line 1478, in load_library ctypes.CDLL(path) File "D:\ComfyUI-aki-v2.7\python\Lib\ctypes_init.py", line 379, in init self._handle = _dlopen(self._name, mode) ^^^^^^^^^^^^^^^^^^^^^^^^^ FileNotFoundError: Could not find module 'D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio\lib\libtorio_ffmpeg6.pyd' (or one of its dependencies). Try using the full path with constructor syntax. Loading FFmpeg5 Failed to load FFmpeg5 extension. Traceback (most recent call last): File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 116, in _find_ffmpeg_extension ext = _find_versionsed_ffmpeg_extension(ffmpeg_ver) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 108, in _find_versionsed_ffmpeg_extension _load_lib(lib) File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 94, in load_lib torch.ops.load_library(path) File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torch_ops.py", line 1478, in load_library ctypes.CDLL(path) File "D:\ComfyUI-aki-v2.7\python\Lib\ctypes_init.py", line 379, in init self._handle = _dlopen(self._name, mode) ^^^^^^^^^^^^^^^^^^^^^^^^^ FileNotFoundError: Could not find module 'D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio\lib\libtorio_ffmpeg5.pyd' (or one of its dependencies). Try using the full path with constructor syntax. Loading FFmpeg4 Failed to load FFmpeg4 extension. Traceback (most recent call last): File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 116, in _find_ffmpeg_extension ext = _find_versionsed_ffmpeg_extension(ffmpeg_ver) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 108, in _find_versionsed_ffmpeg_extension _load_lib(lib) File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 94, in load_lib torch.ops.load_library(path) File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torch_ops.py", line 1478, in load_library ctypes.CDLL(path) File "D:\ComfyUI-aki-v2.7\python\Lib\ctypes_init.py", line 379, in init self._handle = _dlopen(self._name, mode) ^^^^^^^^^^^^^^^^^^^^^^^^^ FileNotFoundError: Could not find module 'D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio\lib\libtorio_ffmpeg4.pyd' (or one of its dependencies). Try using the full path with constructor syntax. Loading FFmpeg Failed to load FFmpeg extension. Traceback (most recent call last): File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 116, in _find_ffmpeg_extension ext = _find_versionsed_ffmpeg_extension(ffmpeg_ver) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "D:\ComfyUI-aki-v2.7\python\Lib\site-packages\torio_extension\utils.py", line 106, in _find_versionsed_ffmpeg_extension raise RuntimeError(f"FFmpeg{version} extension is not available.") RuntimeError: FFmpeg extension is not available.
