Technical Details About Digital DVD Players
Have you ever wondered why the DVD is so popular a medium? Moreover, it is interesting to note that in the recent times the sale of Digital DVD players have increased manifold.
The reason for such widespread popularity is awesome quality both in video and in audio. A DVD movie is compressed in a high bit rate video and audio. If one compares the encoding format of a DVD and CD, the previous generation movie storing device, then it would be found that the two encoding formats are entirely different from each other.
A CD movie is compressed using the MPEG 1 compression technique. If the bit rate is increased, it gives a higher quality video file. Due to constraints in resolution, a MPEG 1 file cannot go over 352 x 288 pixels in a CD. The CD player also does not support playing a CD which is compressed using a higher resolution.
To play a DVD, we need Digital DVD players. The term “DVD” is an acronym of Digital Video Disk. Digital DVD Players play disks made using two technical standards of DVD video and DVD audio. The player hardware has to be connected to output hardware, preferably a Television set. There are some portable players with a small LCD screen attached, but they fail to play the DVD to its full potential due to hardware portability restrictions.
Digital DVD players have to perform some basic tasks like reading a DVD in ISO or UDF 1.2 format. It can optionally decrypt the packed data using CSS and/or Macrovision. Every DVD has a protection code called the Regional Lockout Code. It limits the DVD manufactured in a certain portion of the world to be played in that part of the world only. The DVD player has the capability of changing the regional code, but it is only limited to 5 changes and no more. After that, the player will not play DVDs from other regions.
Digital DVD players have the ability to decode MPEG 2 video streams with maximum 10 Mbit/s of data. It is the peak range; for a continuous output, the data rate is 8 Mbit/s. Sound is decoded from the MP2, PCM or AC3 format. The video resolution that can be obtained from this high quality data is quite high. The maximum video resolution is 720×576.
Apart from playing DVDs, digital DVD players can play some other formats as well. They can play audio CDs, with formats such as CDDA, mp3, etc. They can also play the earlier generation CDs, that is the Video CD format. They also have the capability to play DTS, the Dolby Digital Theater System. The home cinema decoder is one of the main features of a digital DVD player. Apart from the formats mentioned above, some newer formats are coming to bolster the video scene.
All the formats are variants of MPEG, as the x264 is the MPEG 4, layer 10. Another popular compression method is the MPEG 4 ASP compression, more popularly known as DivX. PC DVD ROM players can play almost all the formats out there.
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Standard Dvr Technical Details you Should Know About
An alternative is that some satellite or (more commonly) cable set-top boxes have a FireWire port that can be connected to a computer. The recorded MPEG stream can be relayed to the computer via this FireWire port; though it can be done live, this is more commonly used for transferring shows from a set-top box with built-in DVR.
Some of the technical details for DVR is given to you below:
1. Designed for rack mounting or desktop configurations.
2. Single or multiple video inputs with connector types consistent with the analogue or digital video provided such as coaxial cable, twisted pair or optical fiber cable. The most common number of inputs are 1, 2, 4, 8, 16 and 32. Systems may be configured with a very large number of inputs by networking or bussing individual DVRs together.
3. Looping video outputs for each input which duplicates the corresponding input video signal and connector type. These output signals are used by other video equipment such as matrix switchers, multiplexers, and video monitors.
4. Controlled outputs to external video display monitors.
5. Front panel switches and indicators that allow the various features of the machine to be controlled.
6. Network connections consistent with the network type and utilized to control features of the recorder and to send and/or receive video signals.
7. Connections to external control devices such as keyboards.
8. A connection to external pan-tilt-zoom drives that position cameras.
9. Internal CD, DVD, VCR devices typically for archiving video.
10. Connections to external storage media.
11. Alarm event inputs from external security detection devices, usually one per video input.
12. Alarm event outputs from internal detection features such as motion detection or loss of video.
Many DVD-based DVRs are equipped with two DVD drives or an additional internal hard drive. This arrangement can be used to copy content from a source DVD, which is disallowed in the U.S. under the Digital Millennium Copyright Act if the disc is encrypted. Most such DVRs will hence not allow recording of video streams from encrypted movie discs.
Some DVD-based DVRs incorporate a Firewire connector which can be used to capture digital video from a MiniDV or Digital 8 camcorder, possibly recording a simple DVD as the camcorder is played back. Some editing of the resulting DVD is usually possible, such as adding chapter points.
Digital video recorders configured for physical security applications record video signals from closed circuit television cameras for detection and documentation purposes. Many are designed to record audio as well. DVRs have evolved into devices that are feature rich and provide services that exceed the simple recording of video images that was previously done through VCRs. A DVR CCTV system provides a multitude of advanced functions over VCR technology including video searches by event, time, date and camera. There is also much more control over quality and frame rate allowing disk space usage to be optimized and the DVR can also be set to overwrite the oldest security footage should the disk become full. In some DVR security systems remote access to security footage using a PC can also be achieved by connecting the DVR to a LAN network or the internet.
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