overview

How to make animation

Q)

What method should I use to animate 320x224 graphics at 8fps? Reading from the CD-ROM cannot keep up with the processing, and even if you load graphics into memory, there are too many and you will run out of memory.

A)

In order to display still image data continuously, it must be stored in various video playback formats, but this can be done using commercially available authoring tools.

If you try to display only full-screen image data while reading uncompressed data directly from the CD-ROM, for example, if you set the number of colors to 32k, simply think about it.

320×224×16(bit)×8(fps)= 9,830,400 bit/sec
(1,228,800 bytes/sec)

No matter how you try, this is impossible as long as you are using CD-ROM. So how does most software accomplish this? They compress and store images, then decode and display them on the screen during playback.

The video library packages we supply include Cinepak True Motion and MPEG.
Note that some software that is already on the market has been used to create video packages using proprietary methods.

Regarding the playback rate of Cinepak/TrueMotion.

Q)

Is it possible to make movies at 30 frames per second at 320 x 240 instead of 320 x 224 with Cinepack/TRUEMOTION?

A)

In any case, with Cinepak/TrueMotion, it is considered impossible to play back 30 frames per second at 320x224 or 320x240. Basically, only 300KB/s of data can be transferred for sound and pictures (this is a problem with the specifications of double-speed CDROMs), so unless the video is compressed very efficiently (almost single color), it will not work at this resolution. Playback is not possible.
Regarding sound, Cinepak does not compress the sound data, so even data with irregular frequencies can be played.
By the way, in the case of Cinepak, the amount of sound data required per second is

For 44.1kHz, 16bit, stereo,
44100x2x2=176kb

It means it's necessary.
In the case of TrueMotion, 4-bit compression called DK4bit is also possible, so using that to express similar specifications

44100x2x0.5=44.1kb

It becomes. By the way, our "Clockwork Night" is 288x144 and 30fps.