Understanding the Difference between SD and HD Recording File Storage Requirements

The consumer market moved to High Definition (HD) video a long time ago, but the industrial inspection industry is still in the process of making the transition. Most of the systems and cameras we sell are still Standard Definition (SD), but we predict that HD will take over within three years.

HIgh definition Recording with the MaggHD™ (Click to enlarge)

So, why the delay? Well, simply stated, it isn’t simple. You can’t just plug an HD camera into an SD system. The signals are different, the same text overlay doesn’t work, and the recording techniques need to change. Inuktun currently offers turnkey systems with HD video, including the MaggHD™ miniature magnetic crawler, and the Spectrum 120HD™ PTZ camera. Both of these systems offer full 1080p video resolution and are supplied with a PC based control system that allows recording of the video directly onto a hard drive. The Spectrum 120HD™ is also available with a miniature monitor/recorder in a portable Pelican® case controller that uses a compact flash (CF) card for storage. In all cases, when you are recording HD video, it is important to understand the options for quality, and the related file sizes. Running out of storage space in the middle of an inspection can be disastrous; this tech tip will help you understand what to expect and how to plan for your HD inspection projects.

Inuktun’s suite of applications, ICON and InPRO, are able to record multiple streams of video, either HD or SD in real time. IM3 technology can record up to two HD streams (or one HD and two SD streams) with any current Intel CPU with Quick-Sync GPU enabled. Our video files are stored with H.264 compression algorithms, with quality options available for different compression bitrates [bitrate is the total number of bits for recording one second of the inspection video and is represented by bits per second, or bps (Ok, that all sounds a bit technical. But this is a tech tip, after all!)]. Inuktun offers three different bitrates: 6Mbps for low quality, 10Mbps for medium quality, and 20Mbps for high quality recording. The table below demonstrates the estimated storage required for recording one hour of video in different formats and qualities.

For more information on Inuktun’s fleet of high definition video cameras and crawlers, contact our team today.