in reply to johann

You can convert videos with better file names using converter presets.
To access the preset dialog, go to the convert menu and press period (.). In the dialog, there will be a list of presets with names like [default] and [last used].
To create a new preset, for example for YouTube, select an existing one such as [default], then right click it and select duplicate, then you can select the duplicated preset and press f2 to rename it.
After that, click the load button and you'll be editing the preset. The most important thing for YouTube is to make sure the destination is File name pattern: %title%.
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