Grass Valley Media Conversion - Manual (Page 28)

Animation Builder Media Conversion Software
Page 28 Miranda Technologies Ltd
Most numbering formats with or without leading zeroes are supported.
No aspect ratio conversion or resizing is performed on the incoming files
(one input pixel maps to a single pixel in the resulting animation). Therefore
the images should be rendered at the appropriate size and pixel aspect ratio
for broadcast video:
♦ 720 x 576 PAL
♦ 720 x 486 NTSC.
♦ 1920 x 1080 HD
♦ 1280 x 720 HD
Images smaller than full frame can of course be processed.
Windows .BMP files, Quantel VPB files and JPEG files can also all be
imported for animation sequences, but they do not support a separate key
channel. If key channel data is contained in a separate series of images, this
series of images can be imported as key images as a later step.
Fields vs. Frames
PAL Television runs at 25 frames per second and NTSC at 30 frames per
second and each frame consists of two separate fields. It is important to
remember when making images for animations that each field, 1 and 2, are
offset from each other by both Y position (1 line) and time (1/50
th
of a
second, for PAL). Animation Builder works internally in fields and emulates
the interlacing of the TV by adjusting the position of each field as it is
displayed.
Animation Builder supports two ways of importing images to allow smooth,
high-quality animations to be produced. Suppose we wish to produce a one-
second, full-frame PAL animation of a moving object. When this is
broadcast, we need to display 50 distinct fields.
We could render 50 images at 720x576 resolution (each image file will be
used to form a single field of the animation). As each image is input, half of
the lines must be thrown away to produce fields. To tell Animation Builder to
do this, choose Import Animation Images as Fields in the Preferences
dialog. This works quite well, but the rendering of the animation will take
twice as long as is required, because of the redundant data being produced.