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Topic: VBR


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  Variable bitrate - Wikipedia, the free encyclopedia
Variable bitrate (VBR), or less commonly variable bit rate, is a term used in telecommunications and computing that relates to sound or video encoding.
VBR allows a higher bitrate (and therefore more storage space) to be allocated to the more complex segments of media files while less space is allocated to less complex segments.
The basic argument for using VBR streams is quite simple and compelling — it produces a better quality-to-space ratio compared to an equivalent CBR algorithm.
en.wikipedia.org /wiki/Variable_bit_rate   (300 words)

  
 VBR
The latest wheeled armored vehicle from Panhard is the VBR, an all-protected high mobility platform.
The VBR is well protected against small arms, anti-tank mines and CBR threats.
Panhard expects VBR to address the requirements of the French Army for a future close-contact battle.
www.defense-update.com /products/v/vbr-panhard.htm   (121 words)

  
 Two-pass MPEG-2 variable-bit-rate encoding
The VBR principle is set forth in Section 4, where the first-pass data is processed to produce second-pass bit-production targets, and tuned to yield a VBR video with a constant visual quality.
Overall, the second-pass VBR results were not very sensitive to the exact value of this threshold, where varying the value from 15 to 25 gave almost identical results.
The general conclusion is that the second-pass VBR sequences visually appear to have a higher overall quality than the ones coded with CBR.
www.research.ibm.com /journal/rd/434/westerink.html   (8477 words)

  
 Collectorz.com :: View topic - How is the VBR figure in each track calculated?
VBR is a Yes/No field which indicates whether the track has a Variable Bit Rate.
The bitrate figure that is shown for VBR files is an average bitrate.
For VBR files the average bitrate is computed from the framecount, the bytecount and the samplerate.
www.collectorz.com /phpbb2/viewtopic.php?t=5365&sid=0877532127256643d70167fc06b15358   (270 words)

  
 VBR-encoding FAQ
Someone pointed out that limiting the lowest possible bitrate in VBR is useless: "-b 160" in VBR limits the lowest possible bitrate to 160.
This serves little purpose when VBR is used, for they use mostly 160k+ frame anyway.
Since one of the main advantage of VBR is to minimize the use of bit reservoir, this doesn't make much sense.
www.geocities.com /altbinariessoundsmusicclassical/vbr-encoding.htm   (1548 words)

  
 problems editing with Virtualdub and vbr audio - Topic Powered by eve community   (Site not responding. Last check: 2007-10-31)
I used ~128 vbr audio on it and when I try to open it up in virtualdub it says that it has detected an improper vbr audio stream and that it will rewrite it.
VBR will work just fine, but use LAME to encode the audio, and ensure that you have the Radium MP3 codec installed on any system you want to playback on.
VBR of course offers the best sound quality for your file size, which is why it is better suited to making audio only files like mp3s.
forums.divx.com /eve/ubb.x/a/tpc/f/201101651/m/108102971   (1169 words)

  
 TwoLAME: MPEG Audio Layer II VBR
The VBR mode is mainly centered around the main_bit_allocation() and a_bit_allocation() routines in encode.c.
The limited range of VBR is due to my particular implementation which restricts ranges to within one alloc table (see tables B.2a, B.2b, B.2c and B.2d in ISO 11172).
VBR "guarantees" that all subbands have MNR > VBRLEVEL or that we have reached the maximum bitrate.
www.twolame.org /doc/vbr.html   (1198 words)

  
 VBR - Hydrogenaudio Knowledgebase
Then the encoder tries to maintain the selected quality during the whole stream by choosing the optimal amount of data to represent each frame of audio.
The main advantage is that the user is able to specify the quality level and conserve as much space as possible, but the inconvenience is that the final file size is quite unpredictable.
Most modern encoders are able to perform VBR encoding, including (but not limited to) nearly all popular MP3, AAC, Ogg Vorbis, Musepack, and WMA encoders.
wiki.hydrogenaudio.org /index.php?title=VBR   (156 words)

  
 Enciclopedia - VBR
VBR son las siglas de Variable BitRate (bitrate variable).
Así pues, y resumiendo, lo que hace el VBR es otorgar el bitrate necesario a cada parte del fichero, ya sea de audio o de vídeo, consiguiendo una calidad mayor en ficheros de un tamaño reducido.
Y hay otras escenas donde la cámara se mueve, hay disparos, explosiones, etc. Lo que haría el VBR en este caso es ahorrar bitrate de la escena lenta para aplicarlo después a la escena rápida y conseguir así que esta última se vea lo mejor posible.
www.enciclopedia.com /es/v/vb/vbr.php   (329 words)

  
 VBR - KAAwiki   (Site not responding. Last check: 2007-10-31)
Variable Bit Rate, as opposed to Constant Bit Rate or Average Bit Rate, is a type of stream whose bitrate (number of bits per unit of time) changes as necessary.
In a 1-pass encode, bitrate is distributed as the codec sees fit, meaning that you can have uniform quality, but no control over final filesize.
In a n-pass encode, the scene information from the previous pass is logged and used to calculate how to distribute bitrate, so quality is uniform and final size is very close to intended.
www.kickassanime.org /wiki/index.php?title=VBR   (199 words)

  
 VideoHelp.com Forum Archive - wav to mp3 vbr @ 128
The only reason that I can think that anyone would suggest encoding VBR MP3 AVI is so that they can spend every day of their lives on a video forum telling everyone how to fix them.
VBR MP3 causes huge (known) issues with TMPGEnc products when converting to DVD, but as it stands, it can stay associated with the AVI until the cows come home and PCs and settop players will continue to play it.
All the AVIs that I have made use either VBR MP3 or more recently Vorbis and they are flawless.
www.videohelp.com /forum/archive/t269255.html   (653 words)

  
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Since 1989 VBR has been a partner of the Virginia, West Virginia, and Maryland construction industry supporting our customers and other general contractors in the building of some of the most challenging and prestigious projects.
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With combined experience of over 150 years, VBR employs experienced professionals who have a practical knowledge that can prove invaluable to the customer and his engineers and architects in successfully completing the job.
www.vbrexcavation.com /index.html   (187 words)

  
 VBR Vs CBR - encoding acronyms explained - Articles @ MP3Machine
Variable Bit Rate (VBR) encoding is a method that ensures high audio quality bit-allocation decisions during encoding.
The average bit rate may not be as high as the bitrate of an MP3 of the same quality with constant bitrate.
You should use VBR encoding when consistent audio quality is the top priority.
www.mp3machine.com /news/842   (290 words)

  
 WINAMP.COM | Forums - MP3 VBR File Lengths (time) in WinAmp
VBR encoded files have been around for some time now and its a shame that WinAmp 2.81 remains as one of the FEW players that can't handle the format (displayed time).
If these vbr mp3's were encoded using the poor quality Xing Encoder, as used by MusicMatch, RealPukebox, and AudioCatalyst, then that'll be the cause of the problem.
I got some strange results from the 'regular' vbr settings too (see here), but the presets are better anyway.
forums.winamp.com /showthread.php?threadid=126766   (585 words)

  
 Object Oriented Mobile Robot Model (OOMRM) C++ Library 4.1
Currently, the oConsole and oSchedule object use the VBR to coordinate interrupt vector offsets.
In short, that means you declare any number of VBR objects in different modules, but you will be accessing the same object (declared static).
The impact of this ensures that even if another module declares another VBR and request another vector location (openvector), it will be ensure it is truly open between all modules that use the VBR.
mysite.verizon.net /resowiky/hardware/classoVBR.html   (636 words)

  
 Windows Media Audio and Video Codec Interfaces Using VBR Encoding   (Site not responding. Last check: 2007-10-31)
As detailed in the Encoding Methods topic, variable bit rate (VBR) encoding is used to improve the consistency of content quality.
You configure VBR streams in the same way that you encode CBR streams, except for the buffer parameters (bit rate and buffer window).
Peak-constrained VBR is like unconstrained VBR in that it is confined to an average bit rate over the duration of the stream.
msdn.microsoft.com /library/en-us/wmcodecs/htm/usingvbrencoding.asp?...   (482 words)

  
 VBR MP3s in DVD & MP3 Players ? - Hydrogenaudio Forums
It is safe to assume that all modern MP3 players are capable of playing VBR files (except perhaps the Ipod).
If you're player is incapable of playing back VBR mp3s, then it is not standard compliant and I would return it if I ever have one that didn't.
But the case seems to be they can really play VBR, although they have quality problems with high bitrate frames.
www.hydrogenaudio.org /forums/index.php?showtopic=24074&hl=   (1458 words)

  
 VBR or CBR? - Neowin.net
The difference does not seem too big to me except the VBR file size is a lot smaller.
VBR allows for the highest quality at any bitrate (apart from 320kbps CBR) due to it allowing the bitrate to fluxuate and not force into a constant state (CBR).
VBR Quality 2, Joint Stereo, Mode/Method* New using Lame 3.97 is the generally recommended setting to get transparent quality without wasting space.
www.neowin.net /forum/index.php?showtopic=479865&view=getnewpost   (904 words)

  
 FhG CBR Beats VBR using Velvet.wav   (Site not responding. Last check: 2007-10-31)
I had previously noticed in a quick listening test that Fraunhofer's VBR files were producing unexpected artifacts using this clip at 70% and 100% VBR quality.
This artifact remains even at 100% VBR quality, while at 192 CBR, there are no background artifacts that I can detect, and I have to concentrate instead on the smear of the scraping instrument in the right channel.
VBR isn't always automatically better than CBR, at least using Fraunhofer's implementation.
www.ff123.net /vbrrank_velvet.html   (253 words)

  
 VBR or No VBR
While VBR takes up more room (and you never know how much) since it depends on the song, 128K is predictable, but there is alot of loss of music when playing back.
I was encoding with Lame 128K, switched to VBR (low compression) and finally decided to encode with LAME @ 256K, no I don't get alot of songs on the mp3 cd's like I did, but it's great for backup because of the noticable sound difference.
This is a VBR preset which will produce slightly smaller files with likely a better sound quality.
www.cdrinfo.com /forum/tm.asp?m=6420&mpage=1&key=?   (1233 words)

  
 Vbr [Archive] - macosx.com - Mac Support
February 8th, 2002, 08:07 PM What exactly is VBR, aside from Variable bit rate....
VBR is a variable algorithum for encoding stuff.
VBR is supposed to allow the algorithm to change bandwidth moment to moment as needed.
www.macosx.com /forums/archive/index.php/t-13148.html   (493 words)

  
 VBR on OverseasJobs.com
The VBR Organization, with managing offices at Vinnell’s corporate headquarters in Fairfax, Virginia, is structured to ensure full authority and autonomy of decision-making at the VBR program headquarters level in Adana, Turkey.
A VBR board of directors, comprised of the president of Vinnell Corporation, and the president of Brown and Root Services Corporation, meets quarterly to review and monitor both the fiscal aspects of the contract and performance.
He reports to the VBR Director of Operations and has full authority and autonomy for the execution of the TBMC.
www.overseasjobs.com /do/profile/436   (697 words)

  
 Do all mp3 decoders handle variable bitrate (VBR) files correctly?
Common problems include not being able to decode any VBR file, or only decoding certain types.
However, VBR files are becoming increasingly popular, as they yield a lower bitrate for a given sound quality.
In short, no! There is an unofficial tag that can be included in an mp3 to tell the decoder to true duration of a VBR file, but not all decoders understand it.
mp3decoders.mp3-tech.org /vbr.html   (794 words)

  
 Veronesi Building & Remodeling, Inc.
From reconfiguring a single office space to designing and building retails stores, restaurants, churches and schools, or business complexes, VBR will use the latest technologies and building methods to provide your enterprise with well planned and well implemented construction projects efficiently and cost effectively.
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Whether you want to expand your present home, to repair or maintain your home with new windows, siding, and roof, or to construct your dream house, VBR has the talent, the experience, and the craftsmen to create the living space you desire.
www.vbrinc.com /services.asp   (159 words)

  
 Veronesi Building & Remodeling, Inc.
When Lion Country Supply needed a new showroom and warehouse, VBR planned and erected a Varco Pruden pre-engineered building to satisfy the requirements for a combined retail and storage space.
Since 1981 VBR has consistently been a successful bidder on a variety of private and public construction projects.
VBR offers expertise in general contracting, construction management, sale/leaseback projects, turnkey construction, as well as pre-construction services.
www.vbrinc.com /services_type.asp?type=commercial   (214 words)

  
 Error Joining VBR Audio PLZ HLP!
I have this XVID video file that is too big, and I am converting it into an XVID that is smaller.
But the audio on the original XVID is VBR.
Then I go back to nandub and open up the new video file, choose direct stream, and then audio I choose VBR MP3 audio, and select the file I had made.
forums.afterdawn.com /thread_view.cfm/67455   (186 words)

  
 PC AV Tech Digital Coder-Player Report: Audiocatalyst 2.00 in VBR Mode - Winamp 2.23
In other words, good performance with the signals used is probably a reasonable requirement for any audio device, but good performance of perceptual coders with these signals is not an absolute guarantee of good audible performance with musical program material.
Audiocatalyst 2.00 in VBR Mode-Winamp210 Intermodulation, N_H Bitrate
Audiocatalyst 2.00 in VBR Mode-Winamp210 Jitter, N_H Bitrate
www.pcavtech.com /play-rec/audiocat200VBR-winamp223   (759 words)

  
 iTunes 5 Brings Variable Bit Rate (VBR) AAC Encoding :: iPod Hacks :: The Latest and Greatest News and Info for Your ...
One improvement that many may have missed (we have seen no discussion of it as yet) is the addition of variable bit rate (VBR) encoding for AAC files.
With fixed bit rate encoding, every part of a track is encoded at the same bit rate, which is wasteful of disk space when you consider that, say, the thundering crescendo is a much more detailed sound than a period of almost total silence.
Under VBR encoding, the encoder examines the type of audio that is about to be encoded and adjusts the actual bitrate used on that section of sound accordingly; for silence or simplistic waveforms the bitrate is lowered while, for complex areas of sound, a higher bitrate is used.
www.ipodhacks.com /article.php?sid=1517   (511 words)

  
 Veronesi Building & Remodeling, Inc.
VBR’s breadth of contracting and building experiences allows the staff to identify possible problems ahead of time and make the needed adjustments or changes to address the matters.
The management style at VBR is the key to its success.
VBR maintains project quality and schedule by completeing more phases of the work with its own work force to assure consistent high quality, competitive work.
www.vbrinc.com /about.asp   (205 words)

  
 VBR - video data bitrate
If a video is said to have a constant data rate or constant BITRate of 150 bytes per second, it means that in every second of video, 150 bytes is used to store the video.
CBR means that the stated BITRate will be constant throughout the video, while VBR will mean that the parts of the video that needs more BITRate will get it, while parts that don't need it will have a lower BITRate.
Variable Bit Rate (VBR) is an MP3 encoding method that's used when file size is not an issue.
www.audio-video-affair.com /vbr.html   (368 words)

  
 VBR vs. CBR - dj forums - The Worldwide DJ Community   (Site not responding. Last check: 2007-10-31)
The exception to this is when you choose the highest possible CBR bitrate, which is 320 kbps (-b 320 = --alt-preset insane), but this produces very large filesizes for very little audible benefit.
The only other thing to keep in mind is that VBR will confuse a lot of even modern-day software and hardware MP3 players.
VBR can also cause trouble when you try to stream it (as the birtare changes constantly).
www.djforums.com /forums/showthread.php?p=770300#post770300   (351 words)

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