That's on purpose, as we don't intend to render in the dimension of 2700×1500. Of course, we know that the footage has a different size from the final output. Most preferrable, shoot in the 2.7K dimension and with Protune on. Now add one or more video clips to your project that you shot with a GoPro HD Hero 3. In the following I will thus show you how easy you can create your own proxy clip profile which you can then tweak to your will. ![]() However, I personally found the predefined profiles to be unsatisfactory for my purposes. Kdenlive already comes with several profiles for working with proxy clips of different dimensions and bit rates. Most of the time, working with proxy clips is totally transparent, except for the increased speed. As they are reduced in size and bit rate they can be processed much faster than your raw source clips. In Kdenlive, you can seamlessly work with so-called «proxy clips»: these are reduced variants of your original source clips. Luckily, Kdenlive has something to speed up your work again. ![]() You will quickly grow tired of heavy delays when editing. However, unless you happen to possess a really highest-end system, these image bit rates are still too much for effectively working in your video editor software. Especially for footage shot in the 2700×1520 dimension and with Protune switched on your video editor needs to process around 45MBits per second for real-time playback, applying all the required effects such as color grading, sharpening, et cetera at the same time. ![]() Working with high-bit rate footage that was shot with a GoPro HD Hero 3 Black Edition easily eats up all your available computational resources in post production.
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