Authoring & Encoding
CD Authoring
CD Authoring is the process of compiling and configuring the data on your CD to function and perform as you envision. For example, we could auto an ‘AutoRun‘ CD to automatically run a certain file when inserted into a computer. We could alternatively author an ‘Enhanced CD’ to contain an audio portion as well as a data portion, thereby performing different in a CD player versus a computer.
The Compact Disc (CD) has been in the market for years as a dominant media for distribution of MPEG-1 VCD and interactive multimedia presentation. A CD can hold approximately 74 min of MPEG-1 video or 36 minutes of MPEG-2 video (S-VCD).
With proven success in CD authoring and content development, DUB hub offers all you need for your CD projects.
- Auto-run program for any executable program, web page, Acrobat pdf or PowerPoint
- MPEG-1 encoding from VHS, S-VHS, 8mm or mini DV
- QuickTime, AVI, RealPlayer encoding
- Flash/Director/Authorware presentation, graphic design
- 3D rendering
- Photography and videography
CD Encoding
To understand how data is stored on a CD, DUB hub has done the homework to understand all of the different conditions of CD encoding.
- Because the laser is tracking the spiral of data using the bumps, there cannot be extended gaps where there are no bumps in the data track. To solve this problem, data is encoded using EFM (eight-fourteen modulation). In EFM, 8-bit bytes are converted to 14 bits, and it is guaranteed by EFM that some of those bits will be 1s.
- Because the laser wants to be able to move between songs, data needs to be encoded into the music telling the drive “where it is” on the disc. This problem is solved using what is known as subcode data. Subcode data can encode the absolute and relative position of the laser in the track, and can also encode such things as song titles.
- Because the laser may misread a bump, there need to be error-correcting codes to handle single-bit errors. To solve this problem, extra data bits are added that allow the drive to detect single-bit errors and correct them.
- Because a scratch or a speck on the CD might cause a whole packet of bytes to be misread (known as a burst error), the drive needs to be able to recover from such an event. This problem is solved by actually interleaving the data on the disc, so that it is stored non-sequentially around one of the disc’s circuits. The drive actually reads data one revolution at a time, and un-interleaves the data in order to play it.
- If a few bytes are misread in music, the worst thing that can happen is a little fuzz during playback. When data is stored on a CD, however, any data error is catastrophic. Therefore, additional error correction codes are used when storing data on a CD-ROM.
GET YOUR FREE QUOTE! Before 5pm? We’ll confirm your quote today!
DVD Authoring
What is DVD Authoring?
DVD authoring the is process of assembling files in a certain sequence to be burned to a DVD. You can simply send us your files, and we can compile them for you. You can send us files in a variety of native or post-production formats. Most customers then use our DVD replication or duplication services in lots of 500.
Meet the DVD: Sides & Layers
To fit multiple movie formats, plus the common extra material like interviews, commentaries, and outtakes, movie studios are making greater use of DVD’s dual-sided, dual-layered capabilities. All DVD players can play all of these different disc types.
Single-sided, single-layer:
Even DVD discs with a single information layer can hold the complete audio and video for a full-length movie, including Dolby® Digital 5.1 soundtracks in three different languages. Total capacity: 4.4 gigabytes (over 2 hours of video).
Double-sided, single-layer:
Most discs of this type include a movie version formatted for a standard TV screen on one side, and a widescreen version on the other side. Only a few titles spread a single version over two sides. In these instances, you’ll need to manually flip the DVD over when it reaches the end of side 1 (only a few recent mega changers are able to change DVD sides). Total capacity: 8.75 gigabytes (about 4.5 hours of video).
Single-sided, dual-layer:
This disc type has two information layers, providing nearly twice the data capacity of a single-layer DVD. The layer closer to the player’s laser pickup has a semi-transparent coating. The laser is able to shine through this layer to read the deeper layer beneath it, then re-focus to read the semi-transparent layer. One way to tell if a DVD is dual-layer is to look at the disc’s playing surface — single-layer discs are silver while dual-layer discs are gold. Total capacity: 8 gigabytes (about 4 hours of video).
Double-sided, dual-layer:
This disc type provides the maximum data capacity. It’s basically two single-sided, dual-layer discs bonded together. So far, only a few movie transfers have been in this format (Ben-Hur is one). As with all double-sided DVDs, unless you own one of the dual-side-play mega changers mentioned above, you’ll have to flip the DVD over yourself. Total capacity: 15.9 gigabytes (over 8 hours of video).
GET YOUR FREE QUOTE! Before 5pm? We’ll confirm your quote today!
Blu-Ray Authoring
DUB hub makes it easy to get your content onto Blu-Ray. Blu-Ray discs fit more, and do more than traditional DVD. Blu-ray discs provide much greater data storage capacity and faster bit rates than standard DVD. Translation: much improved picture and sound quality.
The DVD format was certainly a huge leap compared to VHS tapes, but it has major shortcomings as an entertainment medium for the high-definition era. DVD’s compression scheme and disc structure were designed for standard-definition video. As TVs have grown bigger and better, the limitations of the DVD format have become more apparent. When watching DVDs on some of the better 1080p HDTVs with screens of 50″ or larger, compression noise and artifacts are sometimes noticeable. Blu-ray, on the other hand, offers 1080p resolution for an incredibly smooth, detailed picture.
HD’s much higher level of picture detail requires much more information. So, any high-definition format requires much higher data storage capacity (measured in gigabytes). Here’s an example: a digital recorder with a 250GB hard drive can store about 200 hours of standard-definition video, but only about 30 hours of HD video. HD’s superior picture quality also requires much faster data transfer rates (often called “bit rates”) from the player to your TV (measured in megabits per second — Mbps). If the flow of information from a DVD player to a TV could be characterized as a babbling brook, the flow from a high-definition player would be a roaring river.
DVDs vs. Blu-Ray
| DVD-Video | Blu-Ray Disc | |
|---|---|---|
| Disc capacity (gigabytes) | single-layer (4.7GB); dual-layer (8.5GB) | single-layer (25GB); dual-layer (50GB) |
| Maximum picture resolution (pixels) | 720 x 480 (SDTV) | 1920 x 1080 (HDTV) |
| Maximum data transfer rate for movie playback (Megabits per second) | 11Mbps | 54Mbps |
| Video codecs | MPEG-2 | AVC MPEG-4, VC-1, MPEG-2 |
| Audio codecs | Dolby Digital, DTS | Dolby® Digital, Dolby Digital Plus, Dolby TrueHD (lossless), DTS®, DTS-HD™ High Resolution Audio, DTS-HD Master Audio (lossless) |
| Content protection | Content Scrambling System (CSS) 40-bit, region coding | Advanced Access Content System (AACS) 128-bit, BD+, ROM Mark, region coding |
Blu-Ray Encoding
There is no data difference between a processed duplication and a glass mastered replication disc. In fact, both processes extract the information from your master source in EXACTLY THE SAME WAY. Other than the way your disc is manufactured, – the biggest noticeable difference between a replicated CD / DVD disc and a duplicated CD / DVD disc may be the way the surface is marked. This is usually due to the cost restraints associated with the method chosen to process the order.
Contact Us Today
Lisa Radwan
lisa@dubhubdisc.com
Website: http://www.dubhubdisc.com
Follow Us: Facebook | LinkedIn | Twitter #dubhubdisc
Leave a Comment
Comments (0)