Couldn't find appropriate backend to handle uri separated\t7nafktj\drums.wav and format None #6
Description
After running the program, the below message is received:
Couldn't find appropriate backend to handle uri separated\t7nafktj\drums.wav and format None
`# ComfyUI Error Report
Error Details
- Node ID: 1
- Node Type: DeepExtractV2Node
- Exception Type: RuntimeError
- Exception Message: Couldn't find appropriate backend to handle uri separated\iojrldgw\drums.wav and format None.
Stack Trace
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 498, in execute
output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 316, in get_output_data
return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 290, in _async_map_node_over_list
await process_inputs(input_dict, i)
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 278, in process_inputs
result = f(**inputs)
^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\custom_nodes\ComfyUI-DeepExtractV2\node.py", line 153, in separate
outputs[name] = save_audio(source, str(output_path), **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\custom_nodes\ComfyUI-DeepExtractV2\audio.py", line 186, in save_audio
ta.save(str(path), wav, sample_rate=samplerate,
File "C:\Users\sonnee\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\_backend\utils.py", line 345, in save
backend = dispatcher(uri, format, backend)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\_backend\utils.py", line 239, in dispatcher
raise RuntimeError(f"Couldn't find appropriate backend to handle uri {uri} and format {format}.")
System Information
- ComfyUI Version: 0.3.67
- Arguments: C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\main.py --user-directory C:\Users\sonnee\Documents\ComfyUI\user --input-directory C:\Users\sonnee\Documents\ComfyUI\input --output-directory C:\Users\sonnee\Documents\ComfyUI\output --front-end-root C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\web_custom_versions\desktop_app --base-directory C:\Users\sonnee\Documents\ComfyUI --extra-model-paths-config C:\Users\sonnee\AppData\Roaming\ComfyUI\extra_models_config.yaml --log-stdout --listen 127.0.0.1 --port 8000
- OS: nt
- Python Version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]
- Embedded Python: false
- PyTorch Version: 2.8.0+cu129
Devices
- Name: cuda:0 NVIDIA GeForce RTX 2060 : cudaMallocAsync
- Type: cuda
- VRAM Total: 6441992192
- VRAM Free: 5351931904
- Torch VRAM Total: 0
- Torch VRAM Free: 0
Logs
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2025-11-11T07:22:32.153292 - !!! Exception during processing !!! Couldn't find appropriate backend to handle uri separated\t7nafktj\drums.wav and format None.
2025-11-11T07:22:32.155296 - Traceback (most recent call last):
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 498, in execute
output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 316, in get_output_data
return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 290, in _async_map_node_over_list
await process_inputs(input_dict, i)
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 278, in process_inputs
result = f(**inputs)
^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\custom_nodes\ComfyUI-DeepExtractV2\node.py", line 153, in separate
outputs[name] = save_audio(source, str(output_path), **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\custom_nodes\ComfyUI-DeepExtractV2\audio.py", line 186, in save_audio
ta.save(str(path), wav, sample_rate=samplerate,
File "C:\Users\sonnee\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\_backend\utils.py", line 345, in save
backend = dispatcher(uri, format, backend)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\_backend\utils.py", line 239, in dispatcher
raise RuntimeError(f"Couldn't find appropriate backend to handle uri {uri} and format {format}.")
RuntimeError: Couldn't find appropriate backend to handle uri separated\t7nafktj\drums.wav and format None.
2025-11-11T07:22:32.156295 - Prompt executed in 8.51 seconds
2025-11-11T07:25:32.441461 - got prompt
2025-11-11T07:25:32.774765 - Separated tracks will be stored in C:\Users\sonnee\Documents\ComfyUI\separated2025-11-11T07:25:32.774765 -
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[-0.0068, -0.0068, -0.0068, ..., -0.0067, -0.0068, -0.0068]]])2025-11-11T07:25:33.079043 -
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2025-11-11T07:25:40.852542 - !!! Exception during processing !!! Couldn't find appropriate backend to handle uri separated\25njgg8q\drums.wav and format None.
2025-11-11T07:25:40.853543 - Traceback (most recent call last):
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 498, in execute
output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 316, in get_output_data
return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 290, in _async_map_node_over_list
await process_inputs(input_dict, i)
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 278, in process_inputs
result = f(**inputs)
^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\custom_nodes\ComfyUI-DeepExtractV2\node.py", line 153, in separate
outputs[name] = save_audio(source, str(output_path), **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\custom_nodes\ComfyUI-DeepExtractV2\audio.py", line 186, in save_audio
ta.save(str(path), wav, sample_rate=samplerate,
File "C:\Users\sonnee\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\_backend\utils.py", line 345, in save
backend = dispatcher(uri, format, backend)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\_backend\utils.py", line 239, in dispatcher
raise RuntimeError(f"Couldn't find appropriate backend to handle uri {uri} and format {format}.")
RuntimeError: Couldn't find appropriate backend to handle uri separated\25njgg8q\drums.wav and format None.
2025-11-11T07:25:40.855545 - Prompt executed in 8.41 seconds
2025-11-11T07:25:56.955808 - got prompt
2025-11-11T07:25:57.287109 - Separated tracks will be stored in C:\Users\sonnee\Documents\ComfyUI\separated2025-11-11T07:25:57.287109 -
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[-0.0068, -0.0068, -0.0068, ..., -0.0067, -0.0068, -0.0068]]])2025-11-11T07:25:57.628419 -
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2025-11-11T07:26:05.594662 - !!! Exception during processing !!! Couldn't find appropriate backend to handle uri separated\iojrldgw\drums.wav and format None.
2025-11-11T07:26:05.595662 - Traceback (most recent call last):
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 498, in execute
output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 316, in get_output_data
return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 290, in _async_map_node_over_list
await process_inputs(input_dict, i)
File "C:\Users\sonnee\AppData\Local\Programs\ComfyUI\resources\ComfyUI\execution.py", line 278, in process_inputs
result = f(**inputs)
^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\custom_nodes\ComfyUI-DeepExtractV2\node.py", line 153, in separate
outputs[name] = save_audio(source, str(output_path), **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\custom_nodes\ComfyUI-DeepExtractV2\audio.py", line 186, in save_audio
ta.save(str(path), wav, sample_rate=samplerate,
File "C:\Users\sonnee\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\_backend\utils.py", line 345, in save
backend = dispatcher(uri, format, backend)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\sonnee\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\_backend\utils.py", line 239, in dispatcher
raise RuntimeError(f"Couldn't find appropriate backend to handle uri {uri} and format {format}.")
RuntimeError: Couldn't find appropriate backend to handle uri separated\iojrldgw\drums.wav and format None.
2025-11-11T07:26:05.596663 - Prompt executed in 8.64 seconds
Attached Workflow
Please make sure that workflow does not contain any sensitive information such as API keys or passwords.
{"id":"17f76fc8-d693-4751-b766-a8c9285f3cda","revision":0,"last_node_id":9,"last_link_id":7,"nodes":[{"id":2,"type":"LoadAudio","pos":[-880.0439314655393,-216.50500550597926],"size":[274.080078125,136],"flags":{},"order":0,"mode":0,"inputs":[{"localized_name":"audio","name":"audio","type":"COMBO","widget":{"name":"audio"},"link":null},{"localized_name":"audioUI","name":"audioUI","type":"AUDIO_UI","widget":{"name":"audioUI"},"link":null},{"localized_name":"choose file to upload","name":"upload","type":"AUDIOUPLOAD","widget":{"name":"upload"},"link":null}],"outputs":[{"localized_name":"AUDIO","name":"AUDIO","type":"AUDIO","links":[1]}],"properties":{"cnr_id":"comfy-core","ver":"0.3.67","Node name for S&R":"LoadAudio"},"widgets_values":["12 - Dusty Springfield - The Look Of Love.mp3",null,""]},{"id":4,"type":"PreviewAudio","pos":[-151.7501926000244,-240.36960656533287],"size":[270,88],"flags":{},"order":3,"mode":0,"inputs":[{"localized_name":"audio","name":"audio","type":"AUDIO","link":3},{"localized_name":"audioUI","name":"audioUI","type":"AUDIO_UI","widget":{"name":"audioUI"},"link":null}],"outputs":[],"properties":{"cnr_id":"comfy-core","ver":"0.3.67","Node name for S&R":"PreviewAudio"},"widgets_values":[]},{"id":7,"type":"PreviewAudio","pos":[-87.51183260002495,-37.66938656533256],"size":[270,88],"flags":{},"order":5,"mode":0,"inputs":[{"localized_name":"audio","name":"audio","type":"AUDIO","link":5},{"localized_name":"audioUI","name":"audioUI","type":"AUDIO_UI","widget":{"name":"audioUI"},"link":null}],"outputs":[],"properties":{"cnr_id":"comfy-core","ver":"0.3.67","Node name for S&R":"PreviewAudio"},"widgets_values":[]},{"id":9,"type":"PreviewAudio","pos":[-6.511832600024945,187.33061343466744],"size":[270,88],"flags":{},"order":7,"mode":0,"inputs":[{"localized_name":"audio","name":"audio","type":"AUDIO","link":7},{"localized_name":"audioUI","name":"audioUI","type":"AUDIO_UI","widget":{"name":"audioUI"},"link":null}],"outputs":[],"properties":{"cnr_id":"comfy-core","ver":"0.3.67","Node name for S&R":"PreviewAudio"},"widgets_values":[]},{"id":1,"type":"DeepExtractV2Node","pos":[-554.3338409468628,-206.96577869440898],"size":[298.7779296875,474],"flags":{},"order":2,"mode":0,"inputs":[{"localized_name":"track","name":"track","type":"AUDIO","link":1},{"localized_name":"out","name":"out","type":"STRING","widget":{"name":"out"},"link":null},{"localized_name":"device","name":"device","type":"COMBO","widget":{"name":"device"},"link":null},{"localized_name":"overlap","name":"overlap","type":"FLOAT","widget":{"name":"overlap"},"link":null},{"localized_name":"shifts","name":"shifts","type":"INT","widget":{"name":"shifts"},"link":null},{"localized_name":"segment","name":"segment","type":"INT","widget":{"name":"segment"},"link":null},{"localized_name":"bit_depth","name":"bit_depth","type":"COMBO","widget":{"name":"bit_depth"},"link":null},{"localized_name":"clip_mode","name":"clip_mode","type":"COMBO","widget":{"name":"clip_mode"},"link":null},{"localized_name":"audio_format","name":"audio_format","type":"COMBO","widget":{"name":"audio_format"},"link":null},{"localized_name":"mp3_bitrate","name":"mp3_bitrate","type":"INT","widget":{"name":"mp3_bitrate"},"link":null},{"localized_name":"mp3_preset","name":"mp3_preset","type":"INT","widget":{"name":"mp3_preset"},"link":null},{"localized_name":"jobs","name":"jobs","type":"INT","widget":{"name":"jobs"},"link":null},{"localized_name":"split","name":"split","type":"BOOLEAN","widget":{"name":"split"},"link":null},{"localized_name":"other_method","name":"other_method","type":"COMBO","widget":{"name":"other_method"},"link":null},{"localized_name":"stem","name":"stem","type":"STRING","widget":{"name":"stem"},"link":null},{"localized_name":"filename","name":"filename","type":"STRING","widget":{"name":"filename"},"link":null}],"outputs":[{"localized_name":"drums","name":"drums","type":"AUDIO","links":[3]},{"localized_name":"bass","name":"bass","type":"AUDIO","links":[4]},{"localized_name":"other","name":"other","type":"AUDIO","links":[5]},{"localized_name":"vocals","name":"vocals","type":"AUDIO","links":[6]},{"localized_name":"derived_stem","name":"derived_stem","type":"AUDIO","links":[7]}],"properties":{"aux_id":"abdozmantar/ComfyUI-DeepExtractV2","ver":"37dcf7fe8d6569ede1277201259e51b7b2c2d271","Node name for S&R":"DeepExtractV2Node"},"widgets_values":["separated","cuda",0.25,1,0,"default","rescale","wav",320,2,0,true,"add","","{track}/{stem}.{ext}"]},{"id":5,"type":"LoadImage","pos":[327.18397739997556,-116.62642656533288],"size":[677.780078125,675.9000000000001],"flags":{},"order":1,"mode":0,"inputs":[{"localized_name":"image","name":"image","type":"COMBO","widget":{"name":"image"},"link":null},{"localized_name":"choose file to upload","name":"upload","type":"IMAGEUPLOAD","widget":{"name":"upload"},"link":null}],"outputs":[{"localized_name":"IMAGE","name":"IMAGE","type":"IMAGE","links":null},{"localized_name":"MASK","name":"MASK","type":"MASK","links":null}],"properties":{"cnr_id":"comfy-core","ver":"0.3.67","Node name for S&R":"LoadImage"},"widgets_values":["NodeUsage.png","image"]},{"id":8,"type":"PreviewAudio","pos":[-22.793832600024952,78.8526134346675],"size":[270,88],"flags":{},"order":6,"mode":0,"inputs":[{"localized_name":"audio","name":"audio","type":"AUDIO","link":6},{"localized_name":"audioUI","name":"audioUI","type":"AUDIO_UI","widget":{"name":"audioUI"},"link":null}],"outputs":[],"properties":{"cnr_id":"comfy-core","ver":"0.3.67","Node name for S&R":"PreviewAudio"},"widgets_values":[]},{"id":6,"type":"PreviewAudio","pos":[-120.29283260002491,-133.59238656533248],"size":[270,88],"flags":{},"order":4,"mode":0,"inputs":[{"localized_name":"audio","name":"audio","type":"AUDIO","link":4},{"localized_name":"audioUI","name":"audioUI","type":"AUDIO_UI","widget":{"name":"audioUI"},"link":null}],"outputs":[],"properties":{"cnr_id":"comfy-core","ver":"0.3.67","Node name for S&R":"PreviewAudio"},"widgets_values":[]}],"links":[[1,2,0,1,0,"AUDIO"],[3,1,0,4,0,"AUDIO"],[4,1,1,6,0,"AUDIO"],[5,1,2,7,0,"AUDIO"],[6,1,3,8,0,"AUDIO"],[7,1,4,9,0,"AUDIO"]],"groups":[],"config":{},"extra":{"ds":{"scale":0.7513148009015777,"offset":[1396.7618326000254,374.8353865653326]}},"version":0.4}
Additional Context
(Please add any additional context or steps to reproduce the error here)`