Main update

• Improve performance.
• Add support for preserving the Alpha channel of output file as jpg jpeg and bmp (Merge alpha channel to RGB with black background).
• Fixed performance problems for some resolutions.
• Add benchmark support.
• Bug fixes.

CLI

• Adjust the format of the help message.
• Add multithreading support for directory processing.

GUI

• Fixed incorrectly warning about invalid URL when closing input dialog.
• Add support for specifying FFmpeg path.
• Allow user to specify translation file path.

DSFilter

• Add support for non integer upscaling ratio.

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