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Hi,
I doubt you get easely voice data from pone through usb ... . Also it heavely depends on phone.
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Hi,
I am doing a king of VoIp application and I noticed that a delay is occuring. In the end I find that just by playing back the received input buffer from the microphone the delay was generated (so the problem isn't from network or network code implementation). Do you have any ideea how can I fix this??
Thx. a bunch
asdasdadasd
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Hi,
Firewall may cause that, like in vista firewall on, the voice quality is bad for some reason. I debug it if get more free time.
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Hi again,
The voice quality isn't bad but a delay is consistently building between what I say and what I hear. I tested it and didn;t even care about the other pc who received the voice packets, I just played what I got from WaveIn and noticed the delay.
asdasdadasd
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How about group connection (multiple IP)
unleash the possibilities
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You can use multicast IP then.
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Hello Ivar,
I have been testing your program and i have had problems sending the data over the network. In contrast i've received data from the other end point (not very clear audio, but understandable). Is there some part wrong or is this the behaviour of the program? Maybe i should wait for RTP audio? or you could give me some notes to this problem and go on in this way??
Thank you in advance
Sergio
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Hi,
If network speed is ok and latency not bigger than 50 ms, the voice quality should be as phone quality.
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Hi again,
Thank you for the quickly reply, but i think that this is not my problem because i've tested in my local network, also my internet connection is good. I've been watching the transmited packets between the two points and i don't send anything good. I think that i take always the same number of bytes, but not real bytes i should take from the microphone. Regards as the packet i send, it is not RTP? How is the structure the sended packet?
Sergio Garcia
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It's just raw wav data, encoded/decoded before sending/receiving.
You try to turn off your firewall.
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Hi Ivar,
Ok, i will try with this. I'll tell you the results.
Thanks
Sergio Garcia
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hi Ivar,
as per above subject, i am offered to develop an application whicch is able to send/receive audi video data over LAN.
A kind of Video chat. a person cud able to watch and hear another person sitting in the same network.
while goggling for this... i got ur this article. Can u guide me pls...
Thanx
IPS
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Hi,
The most wisest approach is to use RTP. You just do 1 RTP stream for video, another for audio.
Tough i havent completed RTP yet ... .
You off course you can reuse my code, you can do 2 streams too 1 for video another for audio.
Capturing video and playing it, i havne't looked how to do it, so far i don't have needed it.
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Hi, how if I want to combine that 2 streams into only 1 stream which contains both audio and video ? I'm afraid if I use 2 streams then if the audio packet arrives late then the audio will also play late and vice versa.
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Hi,
You need RTP for that.
You must create 2 rtp sessions, 1 for audio, other for video.
(Because RTP specification allows 1 session to exhange only 1 type of data at time)
RTP has "timestamp" for synchronizing streams like you need.
Though RTP just provides all info you need for sync stream, but streams sync must be done RTP consumer app.
Normally timestamp is NTP clock time.
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Hi, does your library include classes or functions which I can use to transmit video ? I see there is only audio for codec and there is no video codec. And is there any complete documentation of your library ? I may need it. Thanks.
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Currently no video support and also i'm currently rewriting RTP. RTP finished probably during week.
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its great i like it i was looking for something like this cooooooooooooool
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Hi Ivar,
At here,we're waiting for your RTP audio multicasting contribution,and also I'm one in that.
Bigbermusa
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Hi,
It will be available some day, currently running out of time, need todo some real job mean while, billls must be payed, then free stuff can be coded.
It wont be available before next month.
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Hi,
However,I think we're waiting for it and understand your precious time.
Bigbermusa
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Just for letting you know, I am waiting for your RTP version, I am going to work with an Intranet Chat, And thinking this is a good stuff for adding to it, If I use it, i will let you know. GREAT JOB, MAN
Bye
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Hi ivar,
Can you give me idea about implementing Echo cancellation, Noise Reduction, VAD ,Gain Control ,etc. on your example. I looked over internet , but I can not find any resources on .net(c#,vb.net). Also I am waiting for your Server based voip article. Thanks.
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Hi,
I dont have such examples now, but probably there will be, if i get RTP done.
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I tested the application and the voice quality is not good at all (hopefully there's a problem with my PC, mic, etc.).
Is the LumiSoft.NET, a good dll for voice recording and playing?
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