Nokia 9290 Video Style Guide - Page 4

Nokia Mobile Phones Nokia 9290 Communicator Video Editing for the Nokia 9290 Communicator 4(12) 2. How to Digitise Video This section describes how to produce suitable files for Multimedia converter from audio-visual source material. First, you need a signal source, such as a video camera or a video cassette recorder. If your signal source is a video camera, please consider using a fully digital system following the DV specification, for example. Digital video cameras typically provide better video quality than analog cameras. Next you should connect your signal source to the computer you use for digital video editing. If your signal source is analog, you need a video capturing card that digitises the analog video signal. Please refer to the manual of your capture card for details on how to connect your signal source to the capture card. The capturing process is controlled by a capturing application that is typically provided with the capture card. Please refer to the manual of your video capturing program for details on how to drive the capturing process. If your signal source is digital, you can use a digital interface to transfer digitally coded video to your computer. For example, the IEEE 1394 interface is typically used to transfer DV-formatted video to a computer. Notice that you may have to purchase a digital interface card to your computer, as your computer may not include such an interface by default. When you complete these steps, you should have a video file that you can play in your computer. You may want to edit the digitised video file using a video editing application. For example, you can combine several video files to one longer file or cut some parts of a file. When capturing a file or storing an edited file for conversion to NIM format, please remember the following recommendations: • The preferred video file format is Microsoft Audio-Video Interleaved (AVI). • The video image size should be at least 176x144, preferably more. Sizes larger than 320x240 give no advantage when converting files to NIM format. • The video frame rate should be as high as possible. Keep the original rate of the material (typically 25 or 30 Hz) if possible. • The video coding format should be either uncompressed 24 or 32-bit RGB or lightly compressed using a common codec. For example, Intel Indeo 5 with the quality setting around 90 (out of 100) is a good choice for the 320x240 image size. Please do not use 8-bit or 16-bit RGB formats. • The video image aspect ratio should be 4:3 in order to produce images with maximum size for the display of the Nokia 9290 Communicator. • The pixel aspect ratio should be square (1:1). • The preferred audio format is uncompressed 16-bit mono at an 8 kHz sampling rate. If you cannot set up the preferred audio format, use a sampling rate of at least 22 kHz. Preferably, audio should be stored in an uncompressed format or compressed with a high sound quality. Mono sound is sufficient, and stereo sound does not result in any improvements to quality. • The audio recording volume should be relatively high due to limited amplifying capability of the Nokia 9290 Communicator. When editing or shooting a video clip, please remember the following hints to achieve a more pleasing end result. These hints help you to produce smaller files for local playback. • Avoid using a handheld camera. Copyright  Nokia Corporation 2001-2002. All rights reserved.