Sets application preferences.

Main tab:

Output color depth

Selects the default color precision for video display -- 24-bit looks better, but 16-bit is generally faster. This does not affect file output.

Process priority

Force VirtualDub to be at a higher or lower priority than other applications when processing files. VirtualDub will always use CPU time that goes unused by other programs, but you can use this setting to force it to use more or less CPU when other applications need it as well.

Automatically add extension to filenames when saving

Controls whether file extensions (.avi) are automatically added when you type a filename without one in a save dialog.

Display tab:

Enable 16-bit dithering

If enabled, 24-bit images are dithered when displaying in 16-bit to reduce banding, at the cost of a little speed. This does not affect file output.

Scene tab:

Interframe (cut) and intraframe (fade) thresholds

Controls the sensitivity of the scene forward/backward buttons on the position bar. A "scene change" is detected whenever there is a significant change in the image (cut), or scene details drop below a threshold (fade).

CPU tab:

Use default optimizations, or force specific optimizations

By default, VirtualDub automatically detects your CPU and chooses appropriately optimized code paths. If you experience problems due to incorrect detection, you can force specific codepaths on or off in this tab. Note that enabling an optimization not supported by your CPU will result in a crash or incorrect execution.

Note	Video and audio codecs do their own CPU-specific dispatch, and are not controllable by these settings. If you experience problems with a codec that is not detecting your CPU correctly, you must contact the codec manufacturer for help.

AVI tab:

Restrict legacy AVI support to 1 gigabyte

Extended AVI files (AVI 2.0 or OpenDML AVI) are composed of two parts: a legacy AVI portion, and extended AVI blocks. This option drops the limit for the legacy portion from 2GB to 1GB, for applications that cannot handle AVI files between 1-2GB, and may be helpful if you have running applications that scan AVI files and choke on large ones. It has no effect on programs that handle extended AVI files.

Do not correct MPEG layer III audio streams

Some MP3 codecs do not generate MP3 streams at exactly the same rate as specified in their audio format when 44.1KHz sampling rates are used -- this causes a small discrepancy in audio sync of around 0.5%. By default, VirtualDub recomputes the data rate and automatically corrects the audio header when MP3 compression is active. This option allows you to disable correction if it is causing problems, such as an MP3 stream being generated in a format that VirtualDub cannot parse correctly.