CBR, ABR, and VBR are three different encoding modes.Whether it is to check some screens, freezes, and mosaic issues on the line, or to develop a bit rate adaptive function, or to optimize the JitterBuffer of the client player, it requires the cooperation of the encoder sender. We need to make a trade-off in terms of encoding speed, network bandwidth, and video quality, and then choose a code control adjustment scheme that is more suitable for the scene. At the same time, the currently popular ROI coding, the adaptive learning of the coding scene includes ABR, CBR, and VBR. The encoder may differ in implementation and use.
There are generally three bit rates of mp3, namely VBR, ABR and CBR.
1.CBR
CBR is the abbreviation of constant bitrate, which means fixed bit rate in Chinese.
For a CBR MP3 song with a bit rate of 128 kbps, the first 128 kb of the song describes the sound of the first second, and the second 128 Kb describes the sound of the second second... If the song is sung, it will take 640 seconds. , Then the size of the song is 128kb × 640 = 80Mb = 10MB. The so-called 128kbps means 128kb per second. Careful you will find that the volume compressed by this encoding method will be very large, because the bit rate is fixed. Of course, sound quality has some advantages over the other two, although this advantage may be negligible. The music I like very much is compressed with 320kbps CBR encoding. After all, the sound quality is the best, and the hard disk space is not bad.
(Note: 320Kbps CBR encoded mp3 files generally exceed 10MB.)
2.VBR
VBR (Variable Bitrate) dynamic bit rate. That is, there is no fixed bit rate, and the compression software instantly determines what bit rate to use based on the audio data during compression. The simple understanding is that the bit rate of the song at the time when the details are richer will be higher at this time, and lower in other cases, so that both the sound quality and the size are taken into account. For example: at the beginning of the song, a person sings solo and the sound is relatively simple, we use 64kb to describe the sound within one second; at the climax of the song, everyone sings together, the sound is more complicated, we use 256kb to describe one second The voice within the species. At first, the VBR algorithm was not perfect. Lame optimized the VBR algorithm to make it the best encoding mode for MP3. This is a way of taking into account file size on the premise of quality, and is also a coding mode recommended by Guyi people.
Under normal circumstances, I do this: general popular songs, there are many songs, just listen to it, compressed into 192kbps VBR encoded mp3, the volume is small, usually between 3-6MB; the favorite song is compressed as 256kbps VBR encoded mp3, the volume is also OK, between 5-10MB, the sound quality is not bad. (This encoding method is sufficient, the sound quality is guaranteed, and the volume is also considered. The key is that now who cares about the little hard disk space occupied)
3.ABR
ABR (Average Bitrate) average bit rate is an interpolation parameter of VBR. For example, when 192kbps ABR is specified to encode a wav file, Lame will use 192kbps to encode 85% of the file, and then dynamically optimize the remaining 15%: the complex part is encoded with higher than 192kbps, the simple part Use less than 192kbps to encode. Compared with 192kbps CBR, 192kbps ABR is similar in file size, but the sound quality is improved a lot. ABR encoding is 2 to 3 times faster than VBR encoding, and the quality is better than CBR in the range of 128-256kbps. It can be used as a compromise between VBR and CBR. Under normal circumstances, I rarely encounter files with this encoding method, and I basically don't use it myself!
To sum up
When compressing lossless music files, I really like: CBR 320Kbps; generally like: VBR 256kbps; occasionally listen to: VBR 192Kbps
Average bit rate (ABR) refers to the average amount of data transmitted per unit time. It is usually measured in units per second and is usually used for digital music or video. The average file size of ABR will remain predictable, so at a given bit rate, VBR is usually of higher quality than ABR, and ABR is of higher quality than CBR (constant bit rate).
What’s the difference between CBR and VBR encoding?
CBR stands for Constant Bit Rate and is an encoding method that keeps the bit rate constant. In contrast, VBR is a variable bit rate. Generally speaking, the higher the bit rate, the better the audio quality. The advantage of using the CBR method is that the processing speed of audio data is generally faster compared to alternative methods.
What is the difference between ABR and VBR?
The most significant difference between ABR and VBR is in which aspect of the sound file remains the same. VBR-encoded files will always strive to keep the quality constant, while ABR strives to keep the file size constant, so you can infer that the final file size of the VBR file is unknown before the encoding is complete. In a similar way, you won't know the quality of the file until you listen to it, and for this reason, it is better to encode your music file as VBR, because the quality is usually the quality required for the sound file. But for those with limited memory, ABR may provide a new compromise.
Compared with ABR, VBR usually produces a better quality-to-size ratio, and will produce smaller files at very high settings.
CBR and VBR are both important in video and audio coding. They have their own strengths and weaknesses, and all have their own unique uses.
CBR
CBR is used for live encoding, it is the best setting for real-time streaming encoding. The consistency of CBR makes it more reliable for time-sensitive data transmission. This is very suitable for real-time streaming, because most real-time videos are played at a single bit rate. Since constant bit rate processes data at a consistent rate, there is no need to worry about bit rates exceeding Internet speeds. However, the reliability of this method will sacrifice quality in some cases.
We can use VBR for real-time stream encoding, but unless you use a one-time setting, it is rarely recommended.
VBR
Constrained VBR is the best setting for on-demand video transcoding because it can handle larger files while still maintaining a certain degree of consistency. In general, VBR can generate better quality streams, and on-demand video transcoding provides the flexibility of using VBR, so no brains are needed.
The variable bit rate produces a higher quality stream. Since the time sensitivity of transcoding on-demand video files is low, there is no need to worry about the bit rate exceeding the Internet speed, which allows you to flexibly use the advantages of VBR.
CBR and VBR
Just like video content, pure audio streams should use CBR for real-time audio broadcasting, and VBR for on-demand audio streams. However, some audio-specific encoders will not provide you with options to choose from. under these circumstances. You must select any options available. Audio files are much smaller than video files, so any option is fine.
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If you want to know more about them, then you can contact us.
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You may search for other questions:
1.How to Use the 0.5W FM Transmitter for Church Parking Lot ?
2.CBR/VBR/CVBR code rate control method
3. What are CBR, VBV and CPB?
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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]
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Where is Fmuser ?
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Contact: Sky Blue
Cellphone: +8618078869184
WhatsApp: +8618078869184
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E-mail: [email protected]
QQ: 727926717
Skype: sky198710021
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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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For Warranty .
Contact US--->>Return the item to us--->>Receive and send another replace .
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