Autodesk 64006-051108-9001 User Guide - Page 231

Processing Events, lower frame rate, such as 5 fps

Page 231 highlights

Supported Events 223 Processing Events Processing events enable you to specify certain settings without using the Settings dialog. These events do not directly affect how the user views the final encoded file but help streamline the production process. Keyframe Web Poster QuickTime ✔ ✔ Real 10 ✔ Windows Media Keyframe The Keyframe event will force a keyframe at any time in a movie (QuickTime and Real 10) if the codec being used allows forcing. When Cleaner encodes the movie, it requests that the codec create a keyframe at the time specified. Use this feature when creating video to be accessed at specific points, such as a Go to Time event. Placing keyframes at these points may improve the viewer's access speed. Cleaner automatically places keyframes for most codecs, so this is not needed for noninteractive material. Generally, keyframe placement is a task best left to Cleaner unless you have a specific reason to use it. Overuse of keyframes increases the file data rate and can negatively impact the file image quality/playback performance. For more information on keyframes, see "Keyframes or Insert Keyframes" on page 182. Keyframes are set by time and are not tied to a specific frame. This is because frames may be removed from the movie as its frame rate is altered. For example, if you set a keyframe in a 30-fps source movie that is going to be encoded at a lower frame rate, such as 5 fps, Cleaner sets the keyframe at the time specified in the EventStream Editor. However, the keyframe may not be the same frame on which you originally set the keyframe because when frames are removed to convert the file from 30 fps to 5 fps, the original frame may no longer be in the file. To create a Keyframe event: 1. Select a marker or click Add to create new markers. 2. Choose Keyframe from the Events menu. 3. The current time of the file appears in the Start field. Use this time or type a different time into the Start field. You can also use the Start menu to select In Point or Out Point.

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Supported Events
223
Processing Events
Processing events enable you to specify certain settings without using the Settings dialog.
These events do not directly affect how the user views the final encoded file but help streamline
the production process.
Keyframe
The Keyframe event will force a keyframe at any time in a movie (QuickTime and Real 10) if
the codec being used allows forcing. When Cleaner encodes the movie, it requests that the
codec create a keyframe at the time specified.
Use this feature when creating video to be accessed at specific points, such as a Go to Time
event. Placing keyframes at these points may improve the viewer’s access speed.
Cleaner automatically places keyframes for most codecs, so this is not needed for non-
interactive material. Generally, keyframe placement is a task best left to Cleaner unless you
have a specific reason to use it. Overuse of keyframes increases the file data rate and can
negatively impact the file image quality/playback performance. For more information on
keyframes, see “Keyframes or Insert Keyframes” on page 182.
Keyframes are set by time and are not tied to a specific frame. This is because frames may be
removed from the movie as its frame rate is altered.
For example, if you set a keyframe in a 30-fps source movie that is going to be encoded at a
lower frame rate, such as 5 fps, Cleaner sets the keyframe at the time specified in the
EventStream Editor. However, the keyframe may not be the same frame on which you
originally set the keyframe because when frames are removed to convert the file from 30 fps to
5 fps, the original frame may no longer be in the file.
To create a Keyframe event:
1.
Select a marker or click Add to create new markers.
2.
Choose Keyframe from the Events menu.
3.
The current time of the file appears in the Start field. Use this time or type a different time
into the Start field. You can also use the Start menu to select In Point or Out Point.
QuickTime
Real 10
Windows Media
Keyframe
Web Poster