video link not working the rpi5 and gs module

[snowrodeo]

I tried different resolutions, but they all return the same error.

GET /video_feed_0 HTTP/1.1" 500 -
INFO:werkzeug:192.168.40.52 - - [28/Aug/2025 13:55:05] "GET /video_feed_0 HTTP/1.1" 500 -
Error on request:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 335, in run_wsgi
execute(self.server.app)
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 324, in execute
for data in application_iter:
File "/usr/lib/python3/dist-packages/werkzeug/wsgi.py", line 500, in next
return self._next()
^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/werkzeug/wrappers/response.py", line 50, in _iter_encoded
for item in iterable:
File "/home/erik/sandbox/camui/picamera2-WebUI/app.py", line 756, in generate_stream
print(f"\U0001f504 Resolution change detected: {last_resolution} \u2192 {expected_resolution}")
UnicodeEncodeError: 'latin-1' codec can't encode character '\U0001f504' in position 0: ordinal not in range(256)
ERROR:werkzeug:Error on request:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 335, in run_wsgi
execute(self.server.app)
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 324, in execute
for data in application_iter:
File "/usr/lib/python3/dist-packages/werkzeug/wsgi.py", line 500, in next
return self._next()
^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/werkzeug/wrappers/response.py", line 50, in _iter_encoded
for item in iterable:
File "/home/erik/sandbox/camui/picamera2-WebUI/app.py", line 756, in generate_stream
print(f"\U0001f504 Resolution change detected: {last_resolution} \u2192 {expected_resolution}")
UnicodeEncodeError: 'latin-1' codec can't encode character '\U0001f504' in position 0: ordinal not in range(256)

[monkeymademe]

Can you tell me which version you are using?

[Mraanderson]

AI analysis: TL;DR it is the emoji in app.py, line 756. Remove it and try again.

It looks like your application is encountering a UnicodeEncodeError which is causing the server to return a 500 Internal Server Error.
🔎 Breakdown of the Error

1. The HTTP Error
   "GET /video_feed_0 HTTP/1.1" 500 -

• GET /video_feed_0 HTTP/1.1: This is a standard request for a video feed resource.
• 500: This is the HTTP Status Code for Internal Server Error. It means something went wrong on the server side (your Python application) while processing the request.

2. The Root Cause
   The Python traceback points directly to the problem:
   UnicodeEncodeError: 'latin-1' codec can't encode character '\U0001f504' in position 0: ordinal not in range(256)

• The error is happening inside the generate_stream function in app.py on line 756:
  print(f"\U0001f504 Resolution change detected: {last_resolution} \u2192 {expected_resolution}")

• The character \U0001f504 is the Unicode for the 🔄 (clockwise vertical arrows/refresh) emoji.

• The werkzeug server (which is often used by Flask) or the environment it's running in is trying to encode the output of that print statement using the latin-1 (ISO-8859-1) character encoding.

• latin-1 is a very old and limited encoding that only supports 256 characters (ordinals 0-255) and cannot handle modern Unicode characters, like the emoji (🔄). The emoji is a multi-byte character outside that range, hence the error.
  🛠️ How to Fix It
  The best way to resolve this is to ensure your terminal or output stream uses an encoding that supports full Unicode, like UTF-8. Since the error is happening on a print statement (writing to stdout), the fix is typically related to the environment variables for the Python interpreter's output streams.
  You can usually fix this by setting the PYTHONIOENCODING environment variable before running your application.
  Option 1: Set the environment variable before running the script (Recommended)
  export PYTHONIOENCODING=utf8
  python3 /home/erik/sandbox/camui/picamera2-WebUI/app.py

(Replace python3 and the path with how you normally run your application).
Option 2: Modify the Python code (Less ideal, but works)
If you don't need the emoji, you can simply remove the problematic characters from the print statement in app.py line 756:

app.py, line 756 (Before)

print(f"\U0001f504 Resolution change detected: {last_resolution} \u2192 {expected_resolution}")

app.py, line 756 (After - Simple Fix)

print(f"Resolution change detected: {last_resolution} -> {expected_resolution}")

The error is specifically about printing the emoji (🔄) to the console/log, and fixing the environment encoding in Option 1 should resolve the 500 error by allowing the logging to complete without crashing the thread handling the request.