All over the world video clips of different videos are shared. Once captured in video, band concerts will make you feel as if you have them right in your home. Have you watched the same video in both VCD and DVD format? Ever thought of comparing the sound and video quality?
There are myriads of titles available in the market. Some examples of popular movies are Lord of the Rings, The American President, Harry Potter, etc. Most of the movies today are available in both VCD and DVD formats, and if you are a good observer or a lover of great movie experience, you will most likely notice a great difference in video and sound quality between DVD videos and VCD. This is because of the large amount of data that can be stored in DVD format. The higher the quality of videos you want, the higher the size required. And since DVDs offer a good amount of data storage, a different video format has been established as standard format for high quality DVD videos.
A video format is the method of organizing video information into a certain media, like in our case, the DVD. By following standard world video formatting, authors will be sure that their videos can be played in different platforms.
DVD video is composed of two parts: the visual data and the audio data. The visual information for DVD video should be encoded using mpeg-2 (at up to 9.8 MBit/sec data transfer speed) or the lower quality mpeg-1 (at up to 1.856 MBit/sec) compression.
For analog videos, we have two standards: PAL and NTSC. PAL has 50 Hz image scanning frequency and NTSC has 60 Hz. In digital video streaming, standards define the frame rate and resolution of the video. Areas using PAL as standard for analog televisions use 25 frames/sec frame rate for digital videos, while areas using NTSC as standard for analog televisions use 29.97 frames/sec or 23.976 frames/sec frame rate for digital videos.
The standard resolutions for DVD videos using PAL standards include D1 at 720 x 576 pixels, 704 x 576 pixels, half D1 at 352 x 576 pixels, and 352 x 288 pixels when encoded in mpeg-1. On the other hand, the standard resolution for DVD videos using NTSC standards are D1 at 720 x 480 pixels, 704 x 480 pixels, half D1 at 352 x 480 pixels, and 352 x 240 pixels in mpeg-1 format.
DVD video can have up to 8 audio data bands streaming all at once at bit rates up to 1536 Kbit/sec. The sound tracks on the DVD include the dialogue, sound effects, music, etc. These audio files are formatted in:
- DD – Dolby Digital (AC-3)
- DTS – Digital Theater System
- PCM – Pulse code modulation or uncompressed audio
- MP2 – MPEG-1 audio layer 2
On countries with PAL standards, the DVD video’s sound track should contain at least one track formatted in PCM, MP2, or AC-3. NTSC, on the other hand, does not require this.
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