7.1
Table Of Contents
- Avid Liquid Installation
- Avid Liquid Reference Manual
- Contents
- Introduction
- Documentation
- Basics
- Signup
- High Definition
- Input
- EZ Capture
- Logging and Digitizing (Capture)
- Basics
- The Logging Tool and Its Functions
- Video Inlay, Timecode Fields and Status Field
- Player Source (D)
- Reels and Racks (E, F)
- Controls (Player and Edit Buttons, G)
- A/V Inputs (Selecting Source Tracks, H)
- Stereo or Mono (I)
- 4:3 or 16:9 (I)
- Selecting a Media Format/Codec Preset (J)
- Destination Volumes for Digitizing / Capture Volumes (K)
- Select Audio Monitor /Mute
- Video Tool / Calibration Control /IPB Settings
- Clip Tab: Naming and Numbering Clips
- Audio Tab
- Master Tab
- Media Tab
- Send Clips To Timeline (Direct Insert)
- Properties
- Methods
- File Ingest
- Importing Objects
- Copying/Pasting Objects from Other Projects
- Media Management and Object Import
- Creating Objects
- Voice-Over
- Importing EDL/AVID MediaLog Files
- Exchange
- Administration
- The Project
- The Object
- Media Management
- Edit
- Video Editing
- Audio in the Timeline
- Special Functions
- Finish
- Effects in Avid Liquid: The Basics
- Detailed Description of Classic Effect Editors
- Realtime FX
- Commotion Clip FX
- Special FX
- Timewarps and Color Correction
- Color Correction Editor
- Linear Timewarp
- Timewarp Editor
- Audio
- Titler
- DVD Authoring
- Export
- Record to Tape
- Export to File
- Burn to Disc (VCD, SVCD, DVD)
- Customize Avid Liquid
- Glossary
- Index
606
Chapter 11 Realtime FX
Optimizing Realtime Preview
Some tips on enhancing your system‘s realtime performance.
First CPU, then GPU (in effect editing)
You can apply all realtime effects in all combinations imaginable to a clip. But: The best performance is
achieved when CPU effects are applied first, and GPU effects last.
The processing order of effects applied to a clip can be viewed and changed in the clip’s FX Properties:
The list reflects the order in which effects were initially applied. The first effect in the list is processed
first, the last effect is the final. (Right-click a clip and select FX Properties from the shortcut menu.)
The explanation lies in the way CPU and GPU cooperate. The CPU mainly does basic video processing,
e.g., it decodes a frame, and works on certain effects. It then passes on the data to the GPU, which takes
care of additional effects and displaying the image, among other things. But if the GPU has to pass data
back to the CPU, there‘s a bottleneck because bandwidth in the direction from GPU to CPU is much
smaller than vice versa.Therefore it is recommended to process all CPU effects before data is passed to
the GPU. And, as a rule of thumb if maximum performance is called for, use GPU effects - the CPU is
busy with a host of other tasks.
Reduce Preview Quality
If the realtime preview did not flow smoothly enough, you can un-click the button shown to reduce the
display quality of the video inlay. The yellow glow around the button to indicate full quality must not be
visible. If this button is not on your Timeline toolbar, right-click Customize to open the function library
and drag the button to the toolbar.
A different procedure to get the same result: Click the Inlay Quality button and select Quality Low.
The preview image becomes a little blurrier and softer. Rendering and output continues to be performed
at the maximum resolution and quality.
Reduce Preview Quality
The Timeline Properties include an option for reducing FX Quality in the preview. This serves to reduce
system utilization slightly and increase the frame rate at which effects are played back. Final quality for
the master is not compromised.