search for: conceal

Hi, I'm a developer currently using the speex codec in a VOIP application of ours.. It sounds amazing, especially at wideband.. my question is how do I force it to do a concealment? We have a low latency application, and based on the current API, I'm guessing concealment only kicks in when a packet is lost.. However, our jitter buffer knows when a packet is missing, and I'd like to force speex to do a concealment then.. Is this possible? Thanks. -------------- n...

Hi, I would like to know which method uses Speex to conceal the loss of packets. I've reviewed the code and haven't found anything. Thanks in advance. Iago Soto. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://westfish.xiph.org/pipermail/speex-dev/attachments/20040614/bfa135e0/attachment.htm

...put buffer for speex was set to respectively 160 - 320 - 640 samples. Now, I was wondering whether it is possible to reduce this buffer size in order to reduce the latency of the codec. Is this actually possible, or should I leave it as is? In addition, I have another question regarding packet loss concealment. In the manual, I found the encoder can be optimized for a certain percentage of packet loss by means of the SPEEX_SET_PLC_TUNING parameter. What exactly does that optimization mean? Does it mean the speex decoder will use some kind of packet loss concealment algorithm to compensate for lost or...

Hi, I am an engineering student in IIT Guwahati, India. Currently, as a summer project I am working on 'packet loss concealment in voip scenario'. I am eager to know what PLC methods are used at receiver end of speex decoder. And if I could develop some more efficient method I could able to contribute to the speex. Actually, I searched the whole speex manual but failed to find what PLC methods are used. regards, Sr...

Hi Does anyone know where one can get hold of a G729 codec for asterisk which effectively can do packet loss concealment using Steve Kann's wonderful new Jitter buffer. The 2 versions that I know of, (digium's and the IPP one) do not perform great at PLC, especially with 4 or 5% loss. Thanks in advance. Clive

...GIPS codec? It seems that Google, Yahoo, and Skype are licensing from GIPS. Are there any good benchmarking or fair comparisons? 2) In particular, how is the jitter buffer control for Speex in response to intermitent poor connection hiccups? Is it robust enough to smooth out lost packets (error concealment) and quick enough to recover the live conversation smoothly once the packets received are back to normalcy? 3) Has anyone used Speex for live VoIP application? Any good references or examples to start with? 4) Since we are focusing on the user application development, may I know what is the...

> Obviously this is Jean-Marc's decision and I'm not telling > him not to support this compiler. I am however pointing > out that this compiler is yet more work for very little > payoff. In the case of my project, the proponent of C++ > Builder sent me a huge, monsterously ugly and totally > unmaintainable patch to add C++ Builder support. Needless > to say, that

...ity. We have enough bandwidth, the latency to the servers is 100-150ms and the packet loss is around 1%. We tried using the G711 and G729 codec and also have the jitterbuffer enabled. How can I solve this problem of voice quality? Can a better implementation of jitterbuffer with packet loss concealment help? If so how do I get the newer implementation. I would really like to help out in the development of the new jitterbuffer if it has not yet been implemented. Would be grateful if someone can help me out in this regard. Thanks and regards, - Ashish

...al a packet loss, which is wrong. > > > > > > > > > > I would propose that after x lost packets, Asterisk should treat > > > all further lost packets as CN. The proceeding x packets should be > > > interpreted as RTP packet loss and run through the concealment routine. > > > > > Well, no matter what kind of concealment algorithm is used, just the > > first one or two packets will be concealed. The rest losses will result > > in no-playback. No CN interpretation, just absolute silence. > > > That's true - unl...

....org/pipermail/speex-dev/2005-June/003410.html http://lists.xiph.org/pipermail/speex-dev/2005-September/003652.html > 2) In particular, how is the jitter buffer control for Speex in response to > intermitent poor connection hiccups? Is it robust enough to smooth out lost > packets (error concealment) and quick enough to recover the live > conversation smoothly once the packets received are back to normalcy? There is packet loss concealment in Speex even without using the jitter buffer (no, error concealment wasn't invented by GIPS). As for the jitter buffer itself, it's adaptiv...

Hello, I have been running Shorewall for quite some time at an ISP client of mine to protect his LAN. We have just upgraded to 2.2.4 and he now wants to put his servers in a DMZ. The servers have public IPs in two classes xxx.xxx.79.0 and xxx.xxx.242.0. The public IP on the router for each class is xxx.xxx.79.126 and xxx.xxx.242.126. I am using masq and 192.168.1.0 on eth0 LAN I have tried

...003410.html > http://lists.xiph.org/pipermail/speex-dev/2005-September/003652.html > > > 2) In particular, how is the jitter buffer control for Speex in response > to > > intermitent poor connection hiccups? Is it robust enough to smooth out > lost > > packets (error concealment) and quick enough to recover the live > > conversation smoothly once the packets received are back to normalcy? > > There is packet loss concealment in Speex even without using the jitter > buffer (no, error concealment wasn't invented by GIPS). As for the > jitter buffer...

Hi, I have read the mailing list archives and have a question regarding PLC (packet loss concealment).

In my layout I have a navigation bar with a few elements in it. The elements can be toggled on or off and thereby reveal or conceal some subtopics. I store the state of the toggle for the navigation elements in the session. When the page is reloaded, the navigation items are collapsed because the css for display: none is set by default in the html for the navigation elements. Is there a good way to pull the state of the...

Hi I get this mailing-list as a digest (as everyone does, i guess). This is quite inconvinient for answering single questions.. I every digest there is a message with Subject: Re: Samba dingest <NR>... This makes it hard to keep track about whath message the replay is ment for. Another problem is, that mime-attachments don?t seem to work. This is especially bad, because some Microsoft

...d that I could be breaking the codec by removing them > or if all that I removed is just fine. Assuming you're not changing your code, there are very few functions that would be "rarely called" (either it is every time, or it's not). The only exception might be the packet loss concealment function (nb_decode_lost). > these are the functions that I removed: > > In bits.c: > speex_bits_init > speex_bits_init_buffer > speex_bits_destroy > speex_bits_reset > speex_bits_rewind > speex_bits_read_from > speex_bits_flush > speex_bits_read_whole_bytes...

Hello, I'm experiencing some problems with running IAX2 protocol on quite reliable link with G729A codec. My customer has 2mb FR link to the Internet used in about 20%. Ping statistics: 50 packets transmitted, 49 received, 2% packet loss, time 49496ms rtt min/avg/max/mdev = 9.308/13.126/33.307/4.851 ms Everything would be great, but the quality isn't good enough. I have 2mb/512kb DSL

...ot; | less reveals that of all the source addresses trying to poke at 48825, there are 193 unique addresses. Either this indicates a heck of a lot of sites having at my firewall, or that some few sites are all spoofing their addresses. I can sort of understand people whaling away at ports that may conceal gold, from their warped point of view, but I haven't a clue why so many people would be beating on some apparently unassigned and unused port. Anyone got any clues? Thanks in advance! Fred -- ------------------------------------------------------------------------------- .---- Fred Smit...

Narrowband (8 kHz), wideband (16 kHz), and ultra-wideband (32 kHz) compression in the same bitstream What is the meaning of this? can i find more information about this somewhere? And what is packel loss concealment, an you enable this somewhere? thanks! -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20061206/36c6052a/attachment.html

...e more than 100ms > from the last known state, you end up with some weird > blipp-blopp-blooiiing sound. Actually it reminds me of the ambient sound > of weird aliens in bad 50s scifi movies. At that point, silence is much > better :) Then it would be a problem with the packet loss concealment. It's actually decreasing the level of the interpolated audio with time. Maybe it's not decreasing quickly enough? Jean-Marc -- Jean-Marc Valin <Jean-Marc.Valin@USherbrooke.ca> Universit? de Sherbrooke