The relationship between h.264 and mpeg-4:
The h.264/avc (advanced video coding) standard is part 10 of mpeg-4.
The original intention of mpeg-4 is to reduce the video stream of DVD quality from 6 megabits per second to 1.5 megabits per second, and to reduce the bit stream of high-definition TV from tens of megabytes per second to 6 to 8 megabits per second. To achieve this level of coding compression, a technology called avc (advanced video codec) is needed. The International Telecommunications Union (itu) named this technology as the h.264 standard, and mpeg puts this technology in Chapter 10 (part 10) of the mpeg-4 standard. This is the relationship between mpeg-4 and h.264.
h.264/avc is a new generation of video compression coding standard formulated by the joint video group (jvt) composed of iso/iec and itu-t, which was completed in May 2003. Compared with the previous standard, h.264/avc has significantly improved both in compression efficiency and network adaptability. Therefore, the industry generally predicts that it will replace the existing video compression standard in future video applications.
However, the h.264/avc standard only supports entertainment-level video quality due to restrictions on video sources. In order to further expand its application range and adapt it to high-fidelity video compression applications, jvt made an important supplementary extension to h.264/avc in July 2004, called frext (fidelity range extensions).
The source image supported by the first version of the h.264/avc standard is 8b per pixel, and the sampling method is limited to 4:2:0; while the newly expanded frext part expands the scope of standard applications, such as professional video applications , High-resolution/high-fidelity video compression, etc. The improvement of frext on h.264/avc is mainly: (1) further introduce some advanced coding tools to improve the compression efficiency; (2) each sample value of the video source can exceed 8b, up to 12b; (3) ) Added 4:2:2 and 4:4:4 sampling formats; (4) Higher bit rate, higher image resolution; (5) It can meet the requirements of image high fidelity and support lossless compression; ( 6) Support the compression of rgb format, while avoiding the rounding error of chroma space conversion.
Both mpeg-4 visual (mpeg-4 part 2) and h.264 (mpeg-4 part 10) are the new generation of multimedia communication compression and decompression international standards. Among them, mpeg-4 is currently in the market introduction period as the core technology of consumer electronics. For example, the most profitable high-end smart phones currently have dynamic audio-visual photography functions, and the mainstream compression standard is mpeg-4 visual. In addition, most of the audio and video functions supported by 3g (third-generation mobile phones) mobile phones also include mpeg-4 visual encoding and decoding functions. The top product of the multimedia player (note: ipod is a mid-level product) is currently non-pmp (portable media player). Systems with a unit price of 2k~6k ￥ need to include the mpeg-4 visual playback function. The next generation of pmp will further combine the functions of digital cameras and video cameras to meet the needs of full-featured real-time multimedia recording, recording, playback and transmission. Of course, mpeg-4 visual still plays the core and key technical role. h.264 integrates the two standard camps of iso/iec and itu-t to develop the next generation of audio and video compression standards for mpeg-4 visual. The purpose is to further increase the compression rate of natural images, and to ensure a certain level of audio and video quality when the communication environment changes. It is the codec standard for the next generation of digital TV. In order to achieve the above-mentioned purpose, h.264 adopts a number of innovative technologies (which also makes h.264 and mpeg-1/-2/-4 visual incompatible), so the hardware and software design is quite different from mpeg-4 visual. The important thing is that h.264 will be applied to 3g mobile communications. Therefore, h.264 is the killer core technology of next-generation 3c products.
Generally speaking, the comparison between h.264 and mpeg4 refers to the comparison between h.264 and mpeg-4 part 2 advanced simple profile (asp)
Resolution and real-time terms:
Fully real-time: pal=25f/s, ntsc=30f/s
Basic real-time (quasi real-time): pal: 8~15f/s ntsc: 10~17f/s
Non-real time: pal<8f/s ntsc<10f/s
cif (352 x 240 ntsc, 352 x 288 pal)
qcif=cif*1/4=176*120 ntsc,176*144 pal
fd1(d1)=4*cif=704*480 ntsc,704*576 pal
hd1(half-d1)=d1*1/2=704*240 ntsc,704*288 pal
d1 is 480i format, the same definition as ntsc analog TV
D2 is in 480p format, which is the same as progressive scan DVD. The resolution of DVD is 480p, which is 720x480 (ntsc) 720x576 (pal)
d3 is 1080i format, resolution is 1920×1080 i/60hz
d4 is 720p format, resolution is 1280×720 p/60hz
d5 is 1080p format, resolution is 1920×1080 progressive scan, professional format
Patent fee issues:
In terms of patent licensing policy, h.264 has also learned from the experience and lessons of mpeg2 and mpeg4 part2, and introduced a licensing policy that is lower than the previous standard and more operative. For example, the avc license policy charges USD 0.20 per product, which is more than an order of magnitude lower than the USD 4-6 (before 2002) and USD 2.5 (after 2002) charges per terminal for mpeg-2. Compared with mpeg4 part2, in addition to canceling the charge based on codec time (2 cents/hour), it also reduces the charge for content, which has been welcomed by more institutions, enterprises and operators.
Basic knowledge:
The h.264 standard compression system consists of two parts: a video coding layer (vcl) and a network abstraction layer (nal ). Vcl includes vcl encoder and vcl decoder, the main function is video data compression coding and decoding, which includes compression units such as motion compensation, transform coding, and entropy coding. Nal is used to provide vcl with a unified interface that has nothing to do with the network. It is responsible for encapsulating and packaging video data and transmitting it on the network. It uses a unified data format, including a single byte of header information and multiple bytes. Video data and framing, logical channel signaling, timing information, sequence end signal, etc. The packet header contains storage flags and type flags. The storage flag is used to indicate that the current data does not belong to the frame being referenced. The type flag is used to indicate the type of image data. vcl can transmit coding parameters adjusted according to the current network conditions.
Like h.261 and h.263, h.264 also uses differential coding of dct transform coding and dpcm, that is, a hybrid coding structure. Simultaneously,
h.264 introduces a new coding method under the framework of hybrid coding, which improves coding efficiency and is closer to practical applications.
H.264 does not have cumbersome options, but strives to concisely "return to basics". It has better compression performance than h.263++ and has the ability to adapt to multiple channels.
H.264 has a wide range of application goals, which can meet various video applications at different speeds and occasions, and has good processing capabilities against error and packet loss.
The basic system of h.264 does not need to use copyright, has an open nature, and can well adapt to the use of ip and wireless networks. This is of great significance for the current Internet transmission of multimedia information and mobile network transmission of broadband information.
The new fast motion estimation algorithm umhexagons (Chinese patent) is a new algorithm that can save more than 90% of the original fast full search algorithm in h.264. The full name is "asymmetric cross multi-level six-sided Shape grid point search algorithm "(unsymmetrical-cross muti-hexagon search)", this is an integer pixel motion estimation algorithm. Because it is in the condition of maintaining better rate-distortion performance when encoding high bit rate and large moving image sequence The amount of calculation is very low, and it has been formally adopted by the h.264 standard.v
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How far(long) the transmitter cover?
The transmission range depends on many factors. The true distance is based on the antenna installing height , antenna gain, using environment like building and other obstructions , sensitivity of the receiver, antenna of the receiver . Installing antenna more high and using in the countryside , the distance will much more far.
EXAMPLE 5W FM Transmitter use in the city and hometown:
I have a USA customer use 5W fm transmitter with GP antenna in his hometown ,and he test it with a car, it cover 10km(6.21mile).
I test the 5W fm transmitter with GP antenna in my hometown ,it cover about 2km(1.24mile).
I test the 5W fm transmitter with GP antenna in Guangzhou city ,it cover about only 300meter(984ft).
Below are the approximate range of different power FM Transmitters. ( The range is diameter )
0.1W ~ 5W FM Transmitter ：100M ~1KM
5W ~15W FM Ttransmitter : 1KM ~ 3KM
15W ~ 80W FM Transmitter : 3KM ~10KM
80W ~500W FM Transmitter : 10KM ~30KM
500W ~1000W FM Transmitter : 30KM ~ 50KM
1KW ~ 2KW FM Transmitter : 50KM ~100KM
2KW ~5KW FM Transmitter : 100KM ~150KM
5KW ~10KW FM Transmitter : 150KM ~200KM
How to contact us for the transmitter?
Call me +8618078869184 OR
Email me [email protected]
1.How far you want to cover in diameter ?
2.How tall of you tower ?
3.Where are you from ?
And we will give you more professional advice.
About Us
FMUSER.ORG is a system integration company focusing on RF wireless transmission / studio video audio equipment / streaming and data processing .We are providing everything from advice and consultancy through rack integration to installation, commissioning and training.
We offer FM Transmitter, Analog TV Transmitter, Digital TV transmitter, VHF UHF Transmitter, Antennas, Coaxial Cable Connectors, STL, On Air Processing, Broadcast Products for the Studio, RF Signal Monitoring, RDS Encoders, Audio Processors and Remote Site Control Units, IPTV Products, Video / Audio Encoder / Decoder, designed to meet the needs of both large international broadcast networks and small private stations alike.
Our solution has FM Radio Station / Analog TV Station / Digital TV Station / Audio Video Studio Equipment / Studio Transmitter Link / Transmitter Telemetry System / Hotel TV System / IPTV Live Broadcasting / Streaming Live Broadcast / Video Conference / CATV Broadcasting system.
We are using advanced technology products for all the systems, because we know the high reliability and high performance are so important for the system and solution . At the same time we also have to make sure our products system with a very reasonable price.
We have customers of public and commercial broadcasters, telecom operators and regulation authorities , and we also offer solution and products to many hundreds of smaller, local and community broadcasters .
FMUSER.ORG has been exporting more than 15 years and have clients all over the world. With 13 years experience in this field ,we have a professional team to solve customer's all kinds of problems. We dedicated in supplying the extremely reasonable pricing of professional products & services. Contact email : [email protected]
Our Factory
We have modernization of the factory . You are welcome to visit our factory when you come to China.
At present , there are already 1095 customers around the world visited our Guangzhou Tianhe office . If you come to China , you are welcome to visit us .
At Fair
This is our participation in 2012 Global Sources Hong Kong Electronics Fair . Customers from all over the world finally have a chance to get together.
Where is Fmuser ?
You can search this numbers " 23.127460034623816,113.33224654197693 " in google map , then you can find our fmuser office .
FMUSER Guangzhou office is in Tianhe District which is the center of the Canton . Very near to the Canton Fair , guangzhou railway station, xiaobei road and dashatou , only need 10 minutes if take TAXI . Welcome friends around the world to visit and negotiate .
Contact: Sky Blue
Cellphone: +8618078869184
WhatsApp: +8618078869184
Wechat: +8618078869184
E-mail: [email protected]
QQ: 727926717
Skype: sky198710021
Address: No.305 Room HuiLan Building No.273 Huanpu Road Guangzhou China Zip:510620
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English: We accept all payments , such as PayPal, Credit Card, Western Union, Alipay, Money Bookers, T/T, LC, DP, DA, OA, Payoneer, If you have any question , please contact me [email protected] or WhatsApp +8618078869184
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PayPal.  www.paypal.com
We recommend you use Paypal to buy our items ,The Paypal is a secure way to buy on internet .
Every of our item list page bottom on top have a paypal logo to pay.
Credit Card.If you do not have paypal,but you have credit card,you also can click the Yellow PayPal button to pay with your credit card.
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But if you have not a credit card and not have a paypal account or difficult to got a paypal accout ,You can use the following:
Western Union.  www.westernunion.com
Pay by Western Union to me :
First name/Given name: Yingfeng
Last name/Surname/ Family name: Zhang
Full name: Yingfeng Zhang
Country: China
City: Guangzhou
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T/T . Pay by T/T (wire transfer/ Telegraphic Transfer/ Bank Transfer)
First BANK INFORMATION (COMPANY ACCOUNT):
SWIFT BIC: BKCHHKHHXXX
Bank name: BANK OF CHINA (HONG KONG) LIMITED, HONG KONG
Bank Address: BANK OF CHINA TOWER, 1 GARDEN ROAD, CENTRAL, HONG KONG
BANK CODE: 012
Account Name : FMUSER INTERNATIONAL GROUP LIMITED
Account NO. : 012-676-2-007855-0
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Second BANK INFORMATION (COMPANY ACCOUNT):
Beneficiary: Fmuser International Group Inc
Account Number: 44050158090900000337
Beneficiary's Bank: China Construction Bank Guangdong Branch
SWIFT Code: PCBCCNBJGDX
Address: NO.553 Tianhe Road, Guangzhou, Guangdong,Tianhe District, China
**Note: When you transfer money to our bank account, please DO NOT write anything in the remark area, otherwise we won't be able to receive the payment due to government policy on international trade business.
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* It will be sent in 1-2 working days when payment clear.
* We will send it to your paypal address. If you want to change address, please send your correct address and phone number to my email [email protected]
* If the packages is below 2kg,we will be shipped via post airmail, it will take about 15-25days to your hand.
If the package is more than 2kg,we will ship via EMS , DHL , UPS, Fedex fast express delivery,it will take about 7~15days to your hand.
If the package more than 100kg , we will send via DHL or air freight. It will take about 3~7days to your hand.
All the packages are form China guangzhou.
* Package will be sent as a "gift" and declear as less as possible,buyer don't need to pay for "TAX".
* After ship, we will send you an E-mail and give you the tracking number.
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For Warranty .
Contact US--->>Return the item to us--->>Receive and send another replace .
Name: Liu xiaoxia
Address: 305Fang HuiLanGe HuangPuDaDaoXi 273Hao TianHeQu Guangzhou China.
ZIP:510620
Phone: +8618078869184
Please return to this address and write your paypal address,name,problem on note: |
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