#7768 Video file selection required

Core cause: no input file was selected.

pyVideoTrans validates the input first and aborts the task with "Video file selection required" when the file list is empty.

Solution:

1. Click Select Video/Audio at the top-left of the main interface and pick your mp4/mkv/avi/mov/wav/mp3 file.
   
   (If the dialog itself cannot open, see step 3.)
2. Make sure the selected file is not deleted/renamed and its path is a plain English/number path, e.g.
   
   D:/pyvideotrans 411/input/001.mp4.
   
   Paths containing spaces, Chinese characters or special symbols can make the file fail to load, so the list stays empty and this prompt appears.
3. Folder name pyvideotrans 411 contains a space — recommend renaming the install directory to something like D:/pyvideotrans411.
4. After a valid file appears in the input row, click Start again.
5. Windows security software (360/Tencent/Huorong/Defender) may silently block the file dialog; add the whole software folder to the trust whitelist.

If the file is correctly selected and the message still appears, provide the latest log:

• File: <software dir>/logs/YYYYMMDD.log, copy the last ~30 lines of the error.

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