search for: cbr

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2015 Jan 22
2
Opus for speech: VBR vs CBR
...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...
2003 Mar 07
0
problem with encoding cbr (updated)
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 ----...
2015 Jan 23
0
Opus for speech: VBR vs CBR
...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...
2015 Nov 16
2
Stereo voice not being retained
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...
2008 Mar 02
1
Speex: complexity, VBR, ABR, CBR, quality
...use VBR (vbr => true)? 2) If there relation between setting the vbr => true and the abr value (for example to be 0 or 1 or 10) and the relation between this value and abr (true / false). 3) Any relation between the quality value and the abr value? 4) Is there any setting that I can use cbr and what will be the vbr setting in that case? 5) What is the difference between the complexity and the quality? 6) What is the relation between the complexity and the vbr? And the effection if abr was determined? Sorry for all these questions, but I readed some webs about speex at C:\0Bilal\0Af...
2014 Sep 04
0
[Xiph] #2027: multistream_encode(_float) fails on hard cbr encodes in libopus v1.1
#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...
2014 Sep 04
0
[Xiph] #2027: multistream_encode(_float) fails on hard cbr encodes in libopus v1.1
#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...
2003 Jan 31
1
AW: AW: PlusV algorithm -> CBR
Fredag, 31 januar 2003, skrev du: <p>>Next thing is, that I would like to clarify the difference between a codec's >latency (which I would die to know in exact figures for the vorbis codec one >day - as well as block sizes, but that's another story) and the (bandwidth) >"smoothing window" latency - call it buffering or whatever. One thing is the codec
2001 Jun 22
7
RE: [advanced] Response to Ogg Vorbis comments
...lly free-reigning > VBR. If you try to encode some samples at 128k, it might throw you down > to 32k if it can't reasonable do so (try sox'ing a .wav down to 11025Hz > and then encoding to see what I mean). I doubt any of the encoders > currently out there are really producing CBR-like files. The Vorbis > encoder will be capable of doing so, but it's not our first priority. You don't have to have any doubts about the other codecs. Just encode different content with them and you will see that they will create identical length files regardless of input signal. M...
2015 Nov 25
0
Stereo voice not being retained
Hey Kevin! Once you start dropping under (I think) 32kbps, the codec naturally starts losing stereo separation for the benefit of quality. If you really want perfect stereo at 16kbps CBR (this is horrifically low in my opinion) you might be better off splitting the audio and encoding each part at 8kbps CBR. Or, there may be a magic "enforce 100% stereo" one could pass? (doesn't look like it at https://mf4.xiph.org/jenkins/view/opus/job/opus...
2009 Jul 30
1
CELT for DAB broadcast radio
...mal by September but it should be fine for a demo. This being said, I am wondering how CELT will evolve in the future, considering the focus on "interactive" applications as suggested in the IETF discussions. As you can imagine, our "pure" broadcast application will rely on the CBR qualities of the codec since we are dealing with a fixed capacity channel. To my understanding, the focus on interactive applications will tend to foster VBR strategies within CELT. Any comments on this? Francois. CRC -------------- next part -------------- An HTML attachment was scrubbed... URL:...
2013 Oct 21
2
help with opus_demo
Hi I used opus_demo to clarify how opus works, I try this command: opus_demo -e" audio 8000 1 8000 -cbr /somedirectory/pcm_mono_ochomil.raw /somedirectory/test.opus And I get the file test.opus, then comes the first problem, this file hasn't header so i can't reproduce it using an external tool, how can i add a header to this file Then when i trie to run opus_demo -d 8000...
2004 Jan 09
5
timestamping / latency
...ger the bitrate the lower the latency (i.e. the decoder starts earlier to output some audio data). However, due to the VBR encoding even high bitrate streams might have low bitrates when there is only silence to be transmitted. Is there a way to completely disable VBR encoding in vorbis and use CBR instead? I've tried to flush the encoder like mad to get some ogg pages out of it but this still doesn't raise the bitrate to a signifficant value. Any help is very appreciated! best, Olaf <p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project...
2007 May 04
0
RSVP RESV not seen
...85.3.2 ---> 192.85.3.254-Router-192.85.4.254 --->host2-192.85.4.1 I am using KOM RSVP I am using TG - (Traffic Generator), sender at host1 and recever at host2. HOST1-SENDER CONFIG: alias sender 192.85.3.2 alias receiver 192.85.4.1 estimator sender 1 flow udp sender 2000 receiver 2001 send cbr 64 5 60.0 rsvp 20.0 sync 0 HOST2-RECEIVER CONFIG: #alias sender 192.85.3.2 #alias receiver 192.85.4.1 flow udp 192.85.3.2 2001 192.85.4.1 2000 recv rate sinkrate rsvp 100 RSVP.CONF: - all nodes have the corresponding settings api 4000 interface eth1 refresh 10000 tc cbq 1000000 2500...
2011 Jun 02
2
Server side filebucket issue
...ave called the backup directive in a class called client-conf. Both files are listed below. Can you help me or point me to a solution please? Cheers LawrieC site.pp contains #Define server filebucket as destination for file backups. # filebucket { puppet: server => puppetmaster-cbr.it.csiro.au } module client-conf contains class client-conf { # Class to replace client''s puppet.conf file with a pre-configured puppet.conf. # Replace client''s puppet.conf file with a pre-configured puppet.conf file. Backup the clients existing puppet.conf file. # file { &quot...
2013 May 13
0
DSPs which are suitable for porting OPUS
...; Subject: [opus] opus_demo produces garbage > To: opus at xiph.org > Message-ID: <51907D9B.50803 at gmx.de> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hello! > > I am running opus_demo.exe with the following cmds: > > -e audio 48000 1 16 -cbr m:\test\test1.raw m:\test\test1.opus > > When I open the .opus file with a hex editor, I see only > > > 000000010000000078000000010000000078000000010000000078000000010000000078000000010000000078000000010000000078000000010000000078000000010000000078000000010000000078000000010000000078...
2014 Jun 04
4
opus_multistream_encode_float not working in libopus 1.1
On Wed, Jun 4, 2014 at 4:31 PM, Timothy B. Terriberry <tterribe at xiph.org> wrote: > Alpha Thinktink wrote: >> max_data_bytes=-11 > > That value is passed in by you. I also don't think passing such a value > would have worked in earlier releases. It indicates the size of the > buffer you are passing to the encoder to receive the encoded output. Actually, I'm
2010 Mar 22
2
Vorbis for digital radio at low bitrates
Dear Vorbis Devteam, My name is Michael Feilen and I've been working on Digital Radio Mondiale (DRM) transmitters and receivers for quite a while now. DRM uses HE-AACv2 by Dolby to encode the audio content (see http://www.drm.org/uploads/media/es_201980v030101p.pdf - pages 23 ff). As I think Vorbis is an excellent alternative, I'd like to implement and define an
2002 Jan 08
2
advocacy and added options to ogg123
Hey all. Two topics: First, I teach Computer Science at the high school level at a largish school near Austin, Texas. For the past several years there's been a "jukebox" in my room where students could vote for albums to hear during programming lab time, and random tracks off the winning albums play over the speakers in the classroom. This past week I changed the
2002 Jan 08
2
advocacy and added options to ogg123
Hey all. Two topics: First, I teach Computer Science at the high school level at a largish school near Austin, Texas. For the past several years there's been a "jukebox" in my room where students could vote for albums to hear during programming lab time, and random tracks off the winning albums play over the speakers in the classroom. This past week I changed the