The Archives’ policy is to transfer all digital files to our server and create a copy as soon as possible after receiving them. The videos are lossy, meaning there has been compression to get smaller file sizes, resulting in some loss of data from the original production file. We have seen a wide range of playback quality with these DVDs. Workflows are to be developed for those separately. The Archives also has received other video containers and codecs on DVDs and external drives that include MOV, AVI, MPG, and SWF formats. The video codec itself is MPEG-2 with either linear PCM, AC-3 or DTS audio within the VOB wrapper. IFOs are information files or directions that the DVD player uses and the BUP files are backups of the IFO files. The VOB (video object) files contain the video and audio streams, subtitles, and menus VOB is the wrapper or container. The VIDEO_TS folder contains VOB, IFO, and BUP files and the AUDIO_TS folder is empty. If you have ever viewed the files on a computer, usually you will see an AUDIO_TS folder and a VIDEO_TS folder.
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