Bedienungsanleitung ProDAD Video Shaker (Seite 33 von 38) (Englisch)

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This profile reduces general camera shake and smoothes the camera movement.

In Practice : Harmonise record from a wavering ship

Use this profile for footage you have filmed standing on moving ground.

This profile smoothes all movements, creating a calmer overall effect.

Tips & tricks & more

Mobile/HD/SD/HDV/HDTV

Mercalli is designed for easy editing of HD/HDTV material – certainly the Mercalli Expert version.

Here is some basic information about sensitivity and rendering speed:

Sensitivity

Resolution: theory and practice

Compared to HD/SD material, HDTV footage has a much higher resolution and therefore contains

far more data. These finer nuances in movement allow much greater precision in stabilisation.

Consequently, it should theoretically not be possible to stabilise a VGA sequence with a resolution

of 640x480 px as well as an HDTV sequence.

Moreover, a clip in progressive mode can always be analysed better than an interlaced clip.

This means that HD not only provides the best possible image; its potential regarding the removal

of camera shake is also better. This can be measured and formally shown. However, in practice a

stabilised standard DV clip shown in interlaced mode on a TV screen may subjectively appear to

be much calmer than a DV clip viewed on a computer monitor.

To sum up: although theoretically there may be factors that enhance movement analysis, the

subjective impression of a result is ultimately what counts. Which is why Mercalli lets you set

some options according to your personal tastes…

Rendering speed

The rendering speed depends on a number of factors.

The design of a video editing program's plugin interface may either allow high-speed processing

by Mercalli, or it may restrict the speed. For instance, you can currently render/analyse a DV

sequence (720x576) on a Pentium4 (Duocore) processor at 120 frames per second – provided you

are using Canopus Edius. Other video editing programs may allow the processing of a maximum

of 35 frames per second, even though only a small part of the processor capacity is used. Such an

interface has clearly not been optimised to perfection.

The dimensions of a video signal are also crucial in assessing the rendering speed. For instance,

an SD/DV signal with a resolution of 720x576 can be rendered about five times faster than a

comparable HDTV signal with 1920x1080 pixels. This is to be expected, because HDTV simply

contains five times as much data that need to be taken into account. Another factor can be use of

a codec, which is always a "bottleneck" for data flows and subsequent processing.

For the sake of completeness, other factors that affect rendering should also be mentioned: the

CPU used, the available RAM (the more there is, the better), and the bus system, which must be

not be too small for the other hardware components. But this concerns all processing-intensive

programs that also move large amounts of data within the memory – which includes the video

editing program itself.

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ProDAD Video Shaker Seite 33

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