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There has been many performance-related improvements in kdenlives underlying code since the last release. You don't have to use the new Master effects feature. You can still apply lots of effects to individual clips if you want to. The new Master effects feature is really handy if you want one or more effects to be applied for the duration of a video. There is a new "Master" button on the top left side of the timeline which toggles it's visibility. The new master feature makes it possible to apply effects directly to the timeline itself. Kdenlive would previously only let you apply effects to individual clips on a timeline. Kdenlive has a brand new "Master Effects" feature. The new audio mixer is there and it can be used for simple recordings so it is an improvement. Open Broadcaster Studio is, of course, a lot better than the one button kdenlive has for starting and stopping screen recordings - with no indication if it's actually recording or not. Using the tried and true professional free software audio recording program audacity is preferable when it comes to audio recording, mixing and so on. It can be used to do basic audio recording but it is not ideal. It can not be practically used with kdenlives built-in desktop recorder which is still nothing more than a record button which starts a ffmpeg background process and that's it. The new mixer makes it easy to record audio directly to a track in kdenlives timeline from either a microphone or another audio source. The audio mixer is one of the new features in kdenlive 19.12.
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Kdenlive 19.12 has a brand new audio mixer. Kdenlive is available for Windows and all GNU/Linux distributions. The developers have made many performance improvements under the hood which makes timeline browsing and other commonly done things snappier. It has a new audio mixer, custom filters, a master (global) effects option for the timeline and many small interface improvements. Four months of "intense work" and two hundred commits went into the latest version of the free video editor Kdenlive which is, as the name indicates, built on the KDE framework.
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