NCJ Number
231838
Journal
Journal of Forensic Identification Volume: 60 Issue: 5 Dated: September/October 2010 Pages: 573-588
Date Published
September 2010
Length
16 pages
Annotation
Analysis was conducted on audio-video files to determine capability to digitally export audio information.
Abstract
The laboratory received four proprietary (".wva") audio-video files from a Silicor Technologies, Inc. digital video recorder for analysis. The manufacturer's playback software lacked the capability to digitally export audio information and only allowed audio to be output through real-time playback of the files through a computer sound card. To permit a digital export, analyses were performed to establish the data's format within the files, locate the audio segments, and automate an accurate extraction using an appropriate scripting process. The prepared extraction script produced a rapid method for copying the audio information from the files, audio files usable for authenticity, and files containing additional recorded audio information that was not present during real-time playback. Figures, tables, and references (Published Abstract)