VERDICT
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Fmpeg can do more than decode a video from one format and encode it in another. Between those two steps it can apply a range of filters to the video. So how do these GUIs handle filters? Avidemux has a separate filters list, split into categories, from which you can add and configure filters. Avidemux doesn’t provide options for cropping and scaling in its standard functions, so it’s good to see that these operations can be performed with filters.