The error "Select at least one A/V source" occurs because no video or audio file was selected before clicking "Start".
Solution:
Click the "Select A/V" button (or "翻译视频或音频" in English) at the top of the main window.
Choose one or more video/audio files (hold Ctrl for multiple selection).
Configure the ASR, translation, and dubbing options as needed.
Click "Start" again.
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