Gradio interface unusable in Windows 11

[simonshakespeare-cyber]

Rather painful to find the interface doesn't work after spending so long to get it to build for Windows 11 (as an aside: your build instructions are not very helpful and your requirements.txt is ordered alphabetically rather than in order of dependency, and python version is too old for modern GPUs, etc.)

Running in a Conda env, and attempting to user the gradio interface to generate anything results in the following type of error. The sliders are set at sensible values (as instructed) - and there is no control or slider with a value of 46, so it's a mystery why there is a random doubling of { 'Number of Frames' -1) where a value of 24 was set

Traceback (most recent call last):
File "C:\Users\simon\miniconda3\envs\tooncomposer\Lib\site-packages\gradio\queueing.py", line 626, in process_events
response = await route_utils.call_process_api(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\simon\miniconda3\envs\tooncomposer\Lib\site-packages\gradio\route_utils.py", line 350, in call_process_api
output = await app.get_blocks().process_api(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\simon\miniconda3\envs\tooncomposer\Lib\site-packages\gradio\blocks.py", line 2246, in process_api
inputs = await self.preprocess_data(
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\simon\miniconda3\envs\tooncomposer\Lib\site-packages\gradio\blocks.py", line 1908, in preprocess_data
processed_input.append(block.preprocess(inputs_cached))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\simon\miniconda3\envs\tooncomposer\Lib\site-packages\gradio\components\slider.py", line 155, in preprocess
Number.raise_if_out_of_bounds(payload, self.minimum, self.maximum)
File "C:\Users\simon\miniconda3\envs\tooncomposer\Lib\site-packages\gradio\components\number.py", line 131, in raise_if_out_of_bounds
raise Error(f"Value {num} is greater than maximum value {maximum}.")
gradio.exceptions.Error: 'Value 46 is greater than maximum value 23.'

[lg-li]

Thanks for trying our code. We have not test our code on Windows 11 yet. We will update our requirement.txt and thanks for your suggestion.

The maximum of frame index slider will be updated when you change the number of frames. I am not sure if this is caused by a different version of Gradio?

[simonshakespeare-cyber]

We uninstalled gradio version 5.42.0 and installed version 5.25.2 which does solves the slider out of bounds problem, and enables video generation and vae decoding, which is awesome. However, we now have a video processing/saving problem:

(with gradio version 5.42.0 + fix):

Generated video saved to C:\Users\simon\AppData\Local\Temp\tmpicm_clyb\generated_video.mp4. Current time: 2025-08-19 12:00:35
C:\Users\simon\miniconda3\envs\tooncomposer\Lib\site-packages\gradio\components\video.py:355: UserWarning: Video does not have browser-compatible container or codec. Converting to mp4.
warnings.warn(
Exception in callback _ProactorBasePipeTransport._call_connection_lost(None)
handle: <Handle _ProactorBasePipeTransport._call_connection_lost(None)>
Traceback (most recent call last):
File "C:\Users\simon\miniconda3\envs\tooncomposer\Lib\asyncio\events.py", line 88, in _run
self._context.run(self._callback, *self._args)
File "C:\Users\simon\miniconda3\envs\tooncomposer\Lib\asyncio\proactor_events.py", line 165, in _call_connection_lost
self._sock.shutdown(socket.SHUT_RDWR)
ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host
Exception in callback _ProactorBasePipeTransport._call_connection_lost(None)
handle: <Handle _ProactorBasePipeTransport._call_connection_lost(None)>
Traceback (most recent call last):
File "C:\Users\simon\miniconda3\envs\tooncomposer\Lib\asyncio\events.py", line 88, in _run
self._context.run(self._callback, *self._args)
File "C:\Users\simon\miniconda3\envs\tooncomposer\Lib\asyncio\proactor_events.py", line 165, in _call_connection_lost
self._sock.shutdown(socket.SHUT_RDWR)

I get the following error with gradio 5.25.2:

D:\ToonComposer\ToonComposer\pipeline\i2v_pipeline.py:368: RuntimeWarning: invalid value encountered in cast
frames = ((frames.float() + 1) * 127.5).clip(0, 255).cpu().numpy().astype(np.uint8)
Generated video saved to C:\Users\simon\AppData\Local\Temp\tmp7m4a9xg1\generated_video.mp4. Current time: 2025-08-19 12:06:24
C:\Users\simon\miniconda3\envs\tooncomposer\Lib\site-packages\gradio\components\video.py:355: UserWarning: Video does not have browser-compatible container or codec. Converting to mp4.
warnings.warn(

Sadly none of the temporary video files saved have any video content (just black). Any ideas where things are going wrong, or what I'm missing?