IndexError: list index out of range

[raj6996]

Bug/Issue Description:

PS C:\Users\YL> scenedetect -i "G:\MGPM\Mo.mp4" -o "G
:\MGPM\1" detect-threshold -t 12 -p 95 list-scenes split-video --copy
[PySceneDetect] Output directory set:
  G:\MGPM\1
[PySceneDetect] Loaded 1 video, framerate: 50.00 FPS, resolution: 720 x 404
[PySceneDetect] Downscale factor set to 3, effective resolution: 240 x 134
[PySceneDetect] Scene list CSV file name format:
  $VIDEO_NAME-Scenes.csv
[PySceneDetect] Video output file name format: $VIDEO_NAME-Scene-$SCENE_NUMBER
[PySceneDetect] Detecting scenes...
100%|████████████████████████████████████████████████████████████████████▉| 129408/129409 [02:19<00:00, 928.74frames/s]
[PySceneDetect] Processed 129408 frames in 139.3 seconds (average 928.74 FPS).
[PySceneDetect] No scenes detected.
[PySceneDetect] Writing scene list to CSV file:
  G:\MGPM\1\Mo.csv
[PySceneDetect] Scene List:
-----------------------------------------------------------------------
 | Scene # | Start Frame |  Start Time  |  End Frame  |   End Time   |
-----------------------------------------------------------------------

-----------------------------------------------------------------------

[PySceneDetect] Splitting input video using mkvmerge, output path template:
  G:\MGPM\1\$VIDEO_NAME-Scene-$SCENE_NUMBER.mkv
Traceback (most recent call last):
  File "c:\python37\lib\site-packages\click\core.py", line 700, in main
    ctx.exit()
  File "c:\python37\lib\site-packages\click\core.py", line 484, in exit
    sys.exit(code)
SystemExit: 0

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\python37\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\python37\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Python37\Scripts\scenedetect.exe\__main__.py", line 9, in <module>
  File "c:\python37\lib\site-packages\scenedetect\__main__.py", line 58, in main
    cli.main(obj=cli_ctx)   # Parse CLI arguments with registered callbacks.
  File "c:\python37\lib\site-packages\click\core.py", line 700, in main
    ctx.exit()
  File "c:\python37\lib\site-packages\click\core.py", line 331, in __exit__
    self.close()
  File "c:\python37\lib\site-packages\click\core.py", line 420, in close
    cb()
  File "c:\python37\lib\site-packages\scenedetect\cli\context.py", line 425, in process_input
    suppress_output=self.quiet_mode or self.split_quiet)
  File "c:\python37\lib\site-packages\scenedetect\video_splitter.py", line 157, in split_video_mkvmerge
    total_frames = scene_list[-1][1].get_frames() - scene_list[0][0].get_frames()
IndexError: list index out of range
PS C:\Users\YL>

Computing Environment:

• OS: x64 Win10 Pro
• Python Version: x64 3.7
• OpenCV Version: Latest
  Additional Information:
  csv file content:

Scene Number,Start Frame,Start Timecode,Start Time (seconds),End Frame,End Timecode,End Time (seconds),Length (frames),Length (timecode),Length (seconds)

[Breakthrough]

Hi @raj6996;

Good find. This bug is triggered when no scenes have detected, and the split-video command was specified.

I will push a fix to the master branch, and include the bugfix in the next official release of PySceneDetect. I will close this issue when the push has been added; you can download it by installing the latest version of PySceneDetect from source manually in the meantime.

Thank you for your submission!