HDVD is commonly known as a compact disc or economical DVD, and can be played on an ordinary DVD player. The media is DVD-5 (capacity 4.7G), usually DVD-9 (capacity 9.4G), and adopts MPEG-1 or MPEG-2 (commonly used) encoding. Due to the low bit rate, each disc can hold up to 7 hours of video programming (ie, 8-10 episodes of TV series), and the picture quality level is slightly higher than or equal to VCD.
To put it simply, there are about 7 hours of programs on one disc. The picture quality is similar to that of VCD. The sound quality is two-channel. It is fully compatible with DVD players and computers. It seems that HDVD technology was first invented in Japan. After 2002, it was popularized in China's piracy industry, which caused a serious blow to the genuine audio-visual industry. Later, in order to fight against the need for piracy, many genuine manufacturers began to introduce compact discs in the second half of 2004, and the trend is gaining momentum. While viewers in developed countries enjoy high-definition video starting at 1280 & TImes; 720 resolution, the Chinese are still intoxicated with 320 & TImes; 240 compact discs with VCD quality. It should be emphasized that no matter whether MPEG-1 or MPEG-2 encoding is used, once the bitstream is lower than the normal VCD bitstream (that is, video 1.15Mb / s), the quality of the image immediately drops sharply, which is unbearable. This is why the quality of a large number of D9 compact discs (one disc containing more than 20 episodes) is extremely poor. Generally speaking, D5 can hold 7 hours and D9 can hold 13 hours, which means that the capacity of compressed discs is limited on the premise of maintaining the quality level of VCD. 
HDVD, "H" stands for High, high capacity DVD player:
Refers to a DVD disc with multiple movies or multiple episodes compressed and stored on a DVD disc, which can be directly played by a DVD player. In terms of high capacity, it means that it can hold more content. There is no difference between HDVD and ordinary D5, that is, a single-sided single-layer disk with a capacity of about 4.7GB.
The difference between genuine and pirated HDVD-I think all buyers and friends have seen pirated HDVD, and the following may have happened:
1. Unable to play-Both the master disk and the film base used for making pirated discs may have problems, causing the data to be unable to be read normally, or after a few readings, it will not be able to play, and even the disc may break, which is likely Damage your playback device. The production requirements of genuine HDVD are strict, and the number of pressing of each master disc is strictly regulated, and the high-quality film base is also selected. Ensure normal playback.
2. The picture is blurred-pirated discs do not have a regular source, and often record TV programs as the source, which is commonly known as the "gun version". There are also often unrelated content such as advertisements. In order to save costs, pirates often put too much content in a DVD, which must be premised on the loss of picture quality. Genuine HDVD has a regular source, and the production is relatively good. The younger brother once compared the picture quality of HDVD and VCD (Zhou Xingchi's "Golden Hero"). There is almost no difference on TV. The picture of HDVD is slightly better when played on the computer. a little.
3. The picture and sound are disconnected-this problem is the most unbearable and seriously affects the pleasure of watching movies. This is also due to the rough production of pirates or imperfect compression equipment. The production of genuine products is rigorous, at least I have never found such a situation.
4. Packing difference-the packaging of pirated discs is simple, generally using carton packaging, and the carton printing is rough. It often causes wear in transportation, especially for online buyers, which is very important. The genuine HDVD is packed in a plastic box, and the carton is beautifully printed. There is also plastic packaging, which can ensure that buyers get brand new products.
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