[build] Bump minimum Ubuntu build version

Author: Breakthrough

.github/workflows/build.yml

@@ -26,8 +26,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        # TODO: Bump ubuntu 20 to 22 when past EOL date.
-        os: [macos-13, macos-14, ubuntu-20.04, ubuntu-latest, windows-latest]
+        os: [macos-13, macos-14, ubuntu-22.04, ubuntu-latest, windows-latest]
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         exclude:
           # macos-14 builders use M1 (ARM64) which does not have a Python 3.7 package available.

scenedetect/common.py

@@ -209,6 +209,9 @@ def __init__(
         else:
             self._frame_num = self._parse_timecode_number(timecode)
 
+    # TODO(v0.7): Add a PTS property as well and slowly transition over to that, since we don't
+    # always know the position as a "frame number".  However, for the reverse case, we CAN state
+    # the presentation time if we know the frame number (for a fixed framerate video).
     @property
     def frame_num(self) -> ty.Optional[int]:
         return self._frame_num