How to capture audio to disc when streaming A/V over internet

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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

#1 Posted : Monday, August 21, 2006 7:53:59 AM(UTC)

mdailor

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Posts: 6

Hi,

I am trying to capture the audio content of a streaming video conference into a file on a hard drive. Is there an example in the SDK of how to capture to disc the audio that is being streamed over the internet out of a ltmmCapture object and into a ltmmPlay object? Or can you point me to the appropriate API's, please? Thanks.

Mike


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#2 Posted : Thursday, August 24, 2006 1:19:22 AM(UTC)

Maen Hasan

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Mike,

You can use an ltmmConvert control at the receiving (client) side and set its source as follows:
ConvertControl.SourceFile = "ltsf://...."
Which is the address of the sending stream.
You can then save by setting the convert target to a local file on your hard disk.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

#3 Posted : Wednesday, August 30, 2006 9:06:31 AM(UTC)

mdailor

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Posts: 6

Thanks Maen, that worked great for saving the audio at the client side. Now how do I go about saving the audio that I am streaming out of the server side? I tried the same technique (i.e., the LtmmCapture control's TargetFile is set to "ltsf://..." and then the LtmmConvert control's SourceFile is set to that same value, but I get the error message "The operation could not be performed because the filter is in the wrong state.". Thanks in advance...

Mike

#4 Posted : Saturday, September 2, 2006 11:20:16 PM(UTC)

Maen Hasan

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Hello,

Do you mean that you are trying to capture and convert on the same machine (on the server)?

Please let me know how it goes.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

#5 Posted : Tuesday, September 5, 2006 8:05:33 AM(UTC)

mdailor

Groups: Registered
Posts: 6

Hi Maen,

Yes, I have a videoconferencing application that is both a server and a client. The application is using a capture control to capture audio/video and stream it out while simultaneously using a player control to play an incoming stream. What I need to do is record the entire audio portion of the conversation, and my plan is to capture the outgoing audio and the incoming audio to two separate files, then mix them into one final file. But, I cannot figure out how to record the outgoing audio (i.e., the audio being streamed out by the capture object). Thanks for your help.

Mike

#6 Posted : Wednesday, September 6, 2006 4:01:46 AM(UTC)

Maen Hasan

Groups: Registered, Tech Support
Posts: 1,326

Was thanked: 1 time(s) in 1 post(s)

Hello,

Recording the outgoing audio can be done indirectly as follows:
1. Use a second control such as capture control, or maybe even the same convert control you use to save the remote data if you want to save to the same file (half-duplex communication). Call this control1.
2. In the capture control used for capturing the audio data being sent out (call is control2), insert a LEAD Audio Callback filter. Also insert another LEAD Audio Callback filter into the control of step 1 above.
3. In the callback functions of both filters, copy the data from Control2 to Control1.

I didn't try this, but please try it and let me know how it goes.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

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