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What can interfere with stabilisation?
Image noise
The more image noise a video sequence contains, the harder it is for Mercalli to distinguish
between intended and unintended movements. As for any other video editing work, the footage
should therefore be as free from image noise as possible. However, Mercalli can ignore image
noise up to a certain level.
Compressed video
Compressing video generally results in digital artifacts, which can interfere with movement
analysis. You should therefore aim for maximum-quality compression.
Unused image areas
For instance, black bars at the top and bottom of a video clip will be included in the rendering
process.
This also happens, e.g. if you are using HD material in SD projects, and the video editing program
passes video data to the Mercalli plugin that are not based on the original HD footage but on the
downscaled version. Such a clip will also have black bars at the top and bottom.
An easy solution: simply slide the "Important image area" control (for assessing camera shake)
from the "neutral" setting towards "centre". The border areas will then be ignored and
stabilisation will focus on the actual important image areas, which, however, will also be reduced
on the left and right.
Application to individual clip sections
In some cases you may wish to stabilise only parts of a scene, rather than the complete video
clip. Simply partition a clip in the timeline of your video editing program:
| untouched area | area for stabilisation | untouched area |
The area for stabilisation is then stabilised using the Mercalli plugin. This ultimately cuts rendering
time.
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