search for: cbr

Just in case my quotation causeed misunderstnaing... Forget about what I quoted before. Probably, by CBR, Monty meant ABR since CBR is stupidly patented and this is the reason why Vorbis has no CBR option. If you know this, it cannot be a problem but I see there is a question asking what is ABR in the mailing list. >On Thu 28 Jun 2001, 23:27:41 PDT, Monty (xiphmont@xiph.org)Wrote: >then vbr/c...

Hi, Maybe this is documented somewhere, if so, please send me a link to the documentation. My question is: how to set up different (VBR, CBR, ABR) modes when calling the Ogg Vorbis API? Currently I do: CBR: ret = vorbis_encode_setup_managed( &vorbisInfo, getInChannel(), getOutSampleRate(), -1,...

Hi, I try to use the video tag to post videos on my blog I'm using ffmeg2theora to transcode videos in theora Resolution of 320x240 pixels and constant bitrate (CBR) of ~400 kbps seems to be ok for publishing on my blog. I've read that CBR is a better choice than VBR for web publishing regarding the way TCP/IP works. ("In TCP it takes a while for a connection to increase its bandwidth. (And by ?a while? I mean ?not that long? but it?s long enough to...

...ems to choose the bitrate on its own. However, that seems to be an issue on mobile devices. In some cases, when I configure the bitrate to say 20kbps, I see that the outgoing codec bitrate at runtime is sometimes far less (11-12kbps even). That leads to a lower received audio quality. When I choose CBR mode however, the outgoing bitrate is fixed at 20kbps and produces better audio quality. Is there a way to bias the VBR mode to use a value closer to the configured target bitrate or fix this low bitrate issue in any other way? 2. When using CBR mode, there seems to be an issue when I use frame s...

Hi, Regarding to my previous question, I think I have found out from oggenc source code that the correct way to initialize encoding is: vorbis_encode_init_vbr (or vorbis_encode_setup_managed for cbr etc.) vorbis_encode_ctl (to turn off or use avg bitrate management) vorbis_encode_setup_init By this way, there is no problem with encoded stream. However, there is no documentation of the three function above (except vorbis_encode_init_vbr) on the cvs snapshot of vorbis. Thanks... Mete ----...

...gt; > 1) --quality > > Note that in narrowband mode, there are less than 11 different modes, so > quality 1 and 2 are the same, the same for 3 and 4, 5 and 6, and 7 and > 8. Okay, I probably would have noticed that if I had stared at the data for too long. > > 2) --bitrate (CBR?) > > yes, --bitrate is for CBR. Note there are only a few bit-rates available > so the one chosen is the first mode with a bit-rate less or equal the > the bit-rate specified. Okay, so just --bitrate gives CBR. > > 3) --bitrate with --vbr > > With --vbr, you control the...

...reproduce themselves. They are in essence only two-dimensional in space, whereas the data in a sound file is time-dependent. The question really has more to do with the decoded FLAC stream output, which I presume is a linear PCM file, e.g. WAV. If FLAC is lossless and created from an original CBR WAV file, is is true that the decoded output is also CBR when played? That is, WAV in = WAV out, where both are CBR? Thanks for any insights on this matter. I've been told that because a FLAC stream from a server to an application is VBR, that certain transients are not handled correctly,...

...encoding enabled) Notice the VBR encoding enabled message. But when i specify a quality through -q, no VBR encoding enabled message is displayed, and mediainfo http://mediainfo.sourceforge.net/ also displays the Bit rate mode as Constant. So, what should i do to get VBR encoded files instead of CBR. Thanks.

fwiw, there are definitely applications that would use Vorbis but can't until there is a _strict_ CBR mode. Meaning, architecturally the datarate simply cannot exceed X no matter what happens to the quality. Send silence if you have to, but limit the datarate. -dbm -------------- next part -------------- A non-text attachment was scrubbed... Name: winmail.dat Type: application/ms-tnef Size: 326...

...not set on stream 1" I have modified ogginfo to display exact playback length. The original PCM data I am trying to encode is about 89.310s. OggInfo displays "89,309683s" for OGG encoded with VBR setting (that is correct), and it displays "88,170522s" for OGG encoded with CBR setting (that is wrong!). Do I need to do something special for cbr setting? The encoder code is same for cbr and vbr setting. PS: The original PCM data is 44100Hz, 16Bit, 1 Channel (mono). Thanks in advance. --- Mete BALCI Senior Game Programmer Momentum DMT Istanbul, TURKEY ----------------...

...on its own. > However, that seems to be an issue on mobile devices. In some cases, > when I configure the bitrate to say 20kbps, I see that the outgoing > codec bitrate at runtime is sometimes far less (11-12kbps even). That > leads to a lower received audio quality. > When I choose CBR mode however, the outgoing bitrate is fixed at 20kbps > and produces better audio quality. > > Is there a way to bias the VBR mode to use a value closer to the > configured target bitrate or fix this low bitrate issue in any other way? > > 2. > When using CBR mode, there seems...

Hi, Is there any difference between decoding of CBR or VBR streams in realtime in terms of CPU usage/cost? Are sample rates other than 44100Hz supported by Vorbis officially ? If it is supported, is it efficient to use them or is Vorbis specifically (or at the moment) optimized for 44100Hz ? Thanks in advance. --- Mete BALCI Senior Game Programm...

...Is there some time window over which it tries to meet this average? > > I'm still confused as to all of the different ways to specify the bit rat= > e/ > > quality of an encoding. Could you enumerate the valid combinations of > > switches? > > Basically, you have CBR and VBR and you can specify either quality or > bit-rate, so: > > CBR+quality = --quality <int> > VBR+quality = --vbr --quality <float> > CBR+bit-rate = --bitrate <int> > VBR+bit-rate = --abr <int> Okay, so are CBR+quality equivalent to CBR+bit-rate or...

...ve = 14.1, Vgi = 12.4, Vlu = 1.3, Vbr = 1.3, Vh = 1.2, Vli = 12.4, Vk = 2.2, Vm = 140.0, Vsk = 49.0, Vad = 11.2, Vpa = 1.0, Vsp = 1.0 ) Fun_ODE <- function(t,y, pars){ with (as.list(c(y, pars)), { It <- dose/doseduration Car <- Aar/Var Cve <- Ave/Vve Clu <- Alu/Vlu Cli <- Ali/Vli Cbr <- Abr/Vbr Ch <- Ah/Vh Cpa <- Apa/Vpa Csp <- Asp/Vsp Cgi <- Agi/Vgi Ck <- Ak/Vk Cm <- Am/Vm Cad <- Aad/Vad Csk <- Ask/Vsk Kpbbr <- s*fp*Kpfbr Kpbli <- s*fp*Kpfli Kpbh <- s*fp*Kpfh Kpbpa <- s*fp*Kpfpa Kpbsp <- s*fp*Kpfsp Kpbgi <- s*fp*Kpfgi Kpbk <- s*...

Greetings Fellow Vorbis Gurus! How can I encode, using CDex, at a CBR (constant bit rate) rather than the VBR? Also, can one take a 128kbs MP3 file and re-encode it to ogg? If so, please explain the procedure. By the way, I'm using a Windows based system. Thank you! /jp/ dojpaul@coffey.com --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg pro...

...ted to better maintain the quality requested, and so I would have expected, if there were to be distortion, that it would have shown itself with VBR turned off. I thought that VBR turning on VAD might be persuading the encoder to interpret the sound as background noise, but experiments with VAD in CBR mode seem to my ear to add only a very small amount of distortion over non-VAD CBR mode and certainly nothing like the VBR level. I don't believe it is the playback that is at fault as it handles the CBR mode Speex file, the same source Vorbis encoded and the original RIFF files just fine. It...

Hello, I've been using Opus on an STM32 M4 platform for speech coding in mono mode. I thought I'd try stereo for grins to see if I can handle the CPU load, and I'm getting a return code of -1 from opus_decode_float (using CBR and 40ms frames). I decided to try the opusenc and opusdec tools to just see how the command line apps would behave. I am getting decoded audio, but I am losing the stereo separation. My test file has speech obtained with a Tascam Recorder, and I spoke directly into each mic individually. I can...

I've got a dataset which looks like this in the beginning: cbr dust smoking expo 1 0 0.20 1 5 2 0 0.25 1 4 3 0 0.25 1 8 4 0 0.25 1 4 5 0 0.25 1 4 (till no. 1240, anyway, a huge set) I have to analyse cbr and smoking, I know it works with chisq.test() for the whole set, but I only ne...

#2027: multistream_encode(_float) fails on hard cbr encodes in libopus v1.1 -----------------------------------------+------------------------------ Reporter: thinktink | Owner: jmvalin@? Type: defect | Status: closed Priority: P3 | Milestone: Com...

#2027: multistream_encode(_float) fails on hard cbr encodes in libopus v1.1 -----------------------------------------+------------------------------ Reporter: thinktink | Owner: jmvalin@? Type: defect | Status: closed Priority: P3 | Milestone: Com...