Fix prod build: download progress, robust stderr, full tracebacks

- Force tqdm disable=False in TrackedTqdm so byte progress works in prod
  (huggingface_hub disables tqdm based on logger level, which prevents
  self.n from updating — our progress tracking needs the counter even
  though we don't render to terminal)
- Harden devnull redirect to test writability, not just None check
- Add full traceback logging to all backend error handlers
- Add chatterbox/luxtts/zipvoice hidden imports and metadata to spec

backend/backends/chatterbox_backend.py

@@ -224,7 +224,8 @@ class ChatterboxTTSBackend:
                 task_manager.error_download(model_name, str(e))
             raise
         except Exception as e:
-            logger.error(f"Failed to load Chatterbox: {e}")
+            import traceback
+            logger.error(f"Failed to load Chatterbox: {e}\n{traceback.format_exc()}")
             if not is_cached:
                 progress_manager.mark_error(model_name, str(e))
                 task_manager.error_download(model_name, str(e))

backend/backends/chatterbox_turbo_backend.py

@@ -228,7 +228,8 @@ class ChatterboxTurboTTSBackend:
                 task_manager.error_download(model_name, str(e))
             raise
         except Exception as e:
-            logger.error(f"Failed to load Chatterbox Turbo: {e}")
+            import traceback
+            logger.error(f"Failed to load Chatterbox Turbo: {e}\n{traceback.format_exc()}")
             if not is_cached:
                 progress_manager.mark_error(model_name, str(e))
                 task_manager.error_download(model_name, str(e))

backend/backends/luxtts_backend.py

@@ -149,7 +149,8 @@ class LuxTTSBackend:
             logger.info("LuxTTS loaded successfully")
 
         except Exception as e:
-            logger.error(f"Failed to load LuxTTS: {e}")
+            import traceback
+            logger.error(f"Failed to load LuxTTS: {e}\n{traceback.format_exc()}")
             if not is_cached:
                 progress_manager.mark_error(model_name, str(e))
                 task_manager.error_download(model_name, str(e))

backend/server.py

@@ -9,10 +9,21 @@ import sys
 import os
 
 # On Windows with --noconsole (PyInstaller), sys.stdout/stderr are None.
+# They can also be broken file objects in some edge cases.
 # Redirect to devnull to prevent crashes from print()/tqdm/logging.
-if sys.stdout is None:
+def _is_writable(stream):
+    """Check if a stream is usable for writing."""
+    if stream is None:
+        return False
+    try:
+        stream.write("")
+        return True
+    except Exception:
+        return False
+
+if not _is_writable(sys.stdout):
     sys.stdout = open(os.devnull, 'w')
-if sys.stderr is None:
+if not _is_writable(sys.stderr):
     sys.stderr = open(os.devnull, 'w')
 
 # Fast path: handle --version before any heavy imports so the Rust

backend/utils/hf_progress.py

@@ -64,11 +64,17 @@ class HFProgressTracker:
                     if key in tqdm_kwargs:
                         filtered_kwargs[key] = value
                 
+                # Force-enable the progress bar — we're tracking progress ourselves,
+                # we don't need tqdm to render to a terminal, but we DO need
+                # self.n to be updated when update() is called.
+                filtered_kwargs['disable'] = False
+
                 # Try to initialize with filtered kwargs, fall back to all kwargs if that fails
                 try:
                     super().__init__(*args, **filtered_kwargs)
                 except TypeError:
                     # If filtering failed, try with all kwargs (maybe tqdm version accepts them)
+                    kwargs['disable'] = False
                     super().__init__(*args, **kwargs)
                 
                 self._tracker_filename = filename or "unknown"

backend/voicebox-server.spec

@@ -6,13 +6,23 @@ from PyInstaller.utils.hooks import copy_metadata
 
 datas = []
 binaries = []
-hiddenimports = ['backend', 'backend.main', 'backend.config', 'backend.database', 'backend.models', 'backend.profiles', 'backend.history', 'backend.tts', 'backend.transcribe', 'backend.platform_detect', 'backend.backends', 'backend.backends.pytorch_backend', 'backend.utils.audio', 'backend.utils.cache', 'backend.utils.progress', 'backend.utils.hf_progress', 'backend.utils.validation', 'backend.cuda_download', 'backend.effects', 'backend.utils.effects', 'backend.versions', 'pedalboard', 'torch', 'transformers', 'fastapi', 'uvicorn', 'sqlalchemy', 'librosa', 'soundfile', 'qwen_tts', 'qwen_tts.inference', 'qwen_tts.inference.qwen3_tts_model', 'qwen_tts.inference.qwen3_tts_tokenizer', 'qwen_tts.core', 'qwen_tts.cli', 'pkg_resources.extern', 'backend.backends.mlx_backend', 'mlx', 'mlx.core', 'mlx.nn', 'mlx_audio', 'mlx_audio.tts', 'mlx_audio.stt']
+hiddenimports = ['backend', 'backend.main', 'backend.config', 'backend.database', 'backend.models', 'backend.profiles', 'backend.history', 'backend.tts', 'backend.transcribe', 'backend.platform_detect', 'backend.backends', 'backend.backends.pytorch_backend', 'backend.utils.audio', 'backend.utils.cache', 'backend.utils.progress', 'backend.utils.hf_progress', 'backend.utils.validation', 'backend.cuda_download', 'backend.effects', 'backend.utils.effects', 'backend.versions', 'pedalboard', 'chatterbox', 'chatterbox.tts_turbo', 'chatterbox.mtl_tts', 'backend.backends.chatterbox_backend', 'backend.backends.chatterbox_turbo_backend', 'backend.backends.luxtts_backend', 'zipvoice', 'zipvoice.luxvoice', 'torch', 'transformers', 'fastapi', 'uvicorn', 'sqlalchemy', 'librosa', 'soundfile', 'qwen_tts', 'qwen_tts.inference', 'qwen_tts.inference.qwen3_tts_model', 'qwen_tts.inference.qwen3_tts_tokenizer', 'qwen_tts.core', 'qwen_tts.cli', 'requests', 'pkg_resources.extern', 'backend.backends.mlx_backend', 'mlx', 'mlx.core', 'mlx.nn', 'mlx_audio', 'mlx_audio.tts', 'mlx_audio.stt']
 datas += collect_data_files('qwen_tts')
 datas += copy_metadata('qwen-tts')
+datas += copy_metadata('requests')
+datas += copy_metadata('transformers')
+datas += copy_metadata('huggingface-hub')
+datas += copy_metadata('tokenizers')
+datas += copy_metadata('safetensors')
+datas += copy_metadata('tqdm')
 hiddenimports += collect_submodules('qwen_tts')
 hiddenimports += collect_submodules('jaraco')
 hiddenimports += collect_submodules('mlx')
 hiddenimports += collect_submodules('mlx_audio')
+tmp_ret = collect_all('zipvoice')
+datas += tmp_ret[0]; binaries += tmp_ret[1]; hiddenimports += tmp_ret[2]
+tmp_ret = collect_all('linacodec')
+datas += tmp_ret[0]; binaries += tmp_ret[1]; hiddenimports += tmp_ret[2]
 tmp_ret = collect_all('mlx')
 datas += tmp_ret[0]; binaries += tmp_ret[1]; hiddenimports += tmp_ret[2]
 tmp_ret = collect_all('mlx_audio')