Adobe Captivate CS 5.5, Mac, DVD, ENG Dokumentacja Pobierz pdf (Strona 118)

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USING CAPTIVATE

Noninteractive Objects and Media

Last updated 9/28/2011

Best practices to use slide videos effectively

• Use slide videos when you want the video to play in synchronisation with the slide contents. For other purposes,

use the FLV file or F4V object, where user gets to control the video (for example, play or pause the video).

• Ensure that the videos have sufficient keyframes. The recommended keyframe interval is at least one keyframe in

every 2 secs.

You can use Adobe Media Encoder (AME) to increase the keyframe interval if necessary. For a 30-fps video,

configure the keyframe-distance to be 60 (frames) in AME (or any other tool of your preference).

• Ensure that the videos have optimal bit-rates so that viewers’ experience is good. Else, many ‘loading...’ messages

are displayed to the users.

Decide the bit-rates based on the server’s as well as your target users’ bandwidth. For information on calculating

bit-rates, see the article at

www.adobe.com/devnet/flash/apps/flv_bitrate_calculator .

• Import video from your local machine rather than from a shared network location. Large videos imported directly

from network locations cause excessive delays and occasional system instability.

• Ensure that the minimum duration for a portion of video on a slide (per slide video) is 3 seconds. This duration is

necessary to ensure that at least a couple of keyframes are assigned per slide.

• Ensure that the maximum duration of a slide video is 999 seconds (maximum slide duration). If the video is longer

than this duration, distribute it among multiple slides. Videos longer than 999 seconds can cause system instability.

• Video dimensions:

• Ensure that the video object dimension is the same as that of the original video for optimal quality.

• Do not change the aspect ratio of the video even if you cannot maintain equal dimensions for the video object

and original video. Otherwise, the video loses quality.

• Keep the dimensions of a video that you want to include in the TOC as: Height 144 and Width 196.

Synchronizing slide videos with the project

1 Decide which of the slides in the project need slide videos. Set optimal duration for such slides so that

synchronization is more effective.

2 Arrange the slides in the order in which they must appear in the video. Reordering the slides after importing the

video is not recommended.

3 Import the video with distribution to span across slides.

4 Use the Edit Video Timing dialog box to specify which part of the video plays on which slide. For more information

see

“Edit video timing” on page 110.

5 Specify which object must appear at what part of the video clip. For more information, see “Synchronizing objects

with video” on page 110.

Publishing projects with slide videos

By default, the published SWF files with slide videos are optimized for progressive downloads of videos. You can host

the publish folder with the SWF file on a web server without changing any settings.

To host the videos on a server other than the one on which the SWF file exists (for example, a video server) or if you

want to use streaming or Flash Video Streaming Service (FVSS):

1 Upload the videos to the server.

2 In the Video Management dialog box (Video > Video Management), specify the path of the video on the server.

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