Apps similar to Smoothie-RS include FFmpeg, which is free and open source. Other options are StaxRip, FFQueue and Voukoder Pro. In total there are four Video Converters like Smoothie-RS for Windows, Linux and Mac.
Comprehensive multimedia framework for decoding, encoding, transcoding, muxing, demuxing, streaming, filtering, and playback of nearly any audio or video format, with command-line tools, integrated libraries, portable code, and regular security updates for users and developers.
StaxRip is a video encoding app for Windows with a unrivaled feature set and usability.
FFQueue is (yet another) graphical user interface for FFMpeg with comprehensive support for both the basic features but also the more advanced features like filtergraphs.
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Voukoder Pro is a system wide video- and audio encoding service that improves your media encoding experience.
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