#5049 Video required

"Video required" error typically indicates that the software is expecting a video file input but none was provided or the file path is invalid.

Possible causes:

1. You clicked "Start" without selecting any video/audio file.
2. The selected file does not exist or the path contains special characters/spaces (Windows may fail if the path is too long or has Chinese characters).
3. The file format is unsupported.

To resolve:

1. Ensure you have clicked "选择音频或视频" and selected a valid file (supports mp4/mov/avi/mkv/webm/mpeg/ogg/mts/ts for video, wav/mp3/m4a/flac/aac for audio).
2. Check that the file path does not contain Chinese characters, spaces, or symbols. Move the file to a simple path like D:\test.mp4.
3. If you are using the "folder" mode, ensure the folder contains at least one valid media file.

If the problem persists, please provide the relevant log file from C:\videotrans\logs\ (the latest .log file, copy the last 30 lines) so I can analyze further.