Add fallback to format duration and debug logging for VideoSource

sexp_effects/primitive_libs/streaming.py

@@ -46,9 +46,16 @@ class VideoSource:
                         self._duration = int(h) * 3600 + int(m) * 60 + float(s)
                 break
 
+        # Fallback: check format duration if stream duration not found
+        if self._duration is None and "format" in info and "duration" in info["format"]:
+            self._duration = float(info["format"]["duration"])
+
         if not self._frame_size:
             self._frame_size = (720, 720)
 
+        import sys
+        print(f"VideoSource: {self.path.name} duration={self._duration} size={self._frame_size}", file=sys.stderr)
+
     def _start_stream(self, seek_time: float = 0):
         """Start or restart the ffmpeg streaming process."""
         if self._proc: