VirtualDub help - Dialogs: Video range
  Processing: Main UI Editing Filtering Rendering/saving Artifacts The pipeline Direct mode Display panes Frameserver Video filter reference Video shader reference Video capture Hardware setup Driver selection Audio setup Pipeline Filtering Info panel Multi-segment mode Timing dialog Performance Troubleshooting Dialogs: Video filters Video frame rate control Video color depth Video range Video compression Audio filters Audio interleaving Audio compression Audio conversion Audio volume Capture settings Preferences On a crash... | Selects a subset of the input to use. Input range Controls how much video at the beginning and ends of the source is skipped during processing, so that only a portion in the middle is used. All offsets can be set in either frames or milliseconds (ms).
  Note | Offsets persist even if you load a new file.
  Note | The end offset is the number of milliseconds from the end, not from the beginning. It is usually easier to set start/end points from the position control (HOME/END).
  Note | You can only select a single range with this dialog; use the delete frames feature to extract multiple segments in a single pass.
Offset audio to maintain a/v sync Controls whether the start offset applies to the audio stream. If unchecked, the start offset deletes frames only from the video stream, advancing it that many frames ahead of the audio stream. This will alter audio/video synchronization accordingly. Cut off audio when video stream ends If the audio stream is longer than the video stream, this controls whether the extra audio is used or not. Generally, players continue to show the last video frame while the remaining audio plays.