Re: [Live-devel] Streaming G711 audio

[d.gorde...@ngslab.ru]

It works! Thanks a lot!



On Nov 15, 2024, at 2:53 AM, d.gorde...@ngslab.ru wrote:

Hi,

Now I have a streamer that streams video with AAC audio:

 audio_sink_ = MPEG4GenericRTPSink::createNew(*env_, 
audio_rtp_socket_.get(), payload,
   16000, "audio", "AAC-hbr", "", 1);

and it works well.

I need also stream G711U or G711A audio. How to make it?

Try the following:
SimpleRTPSink::createNew(*env_, audio_rtp_socket_.get(), payload, 8000, 
“audio”, “PCMU”, 1);
for G711U.  (For G711A, replace “PCMU” with “PCMA”.)


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/


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[Live-devel] Streaming G711 audio

[d.gorde...@ngslab.ru]

Hi,

Now I have a streamer that streams video with AAC audio:

    audio_sink_ = MPEG4GenericRTPSink::createNew(*env_, 
audio_rtp_socket_.get(), payload,

  16000, "audio", "AAC-hbr", "", 1);

and it works well.

I need also stream G711U or G711A audio. How to make it? I see there are 
some classes derived from AudioRTPSink, but doubt which one should I use.



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Re: [Live-devel] Receiving slice-based frames

[d.gorde...@ngslab.ru]

It works, thanks a lot!



On Feb 22, 2025, at 1:10 AM, d.gorde...@ngslab.ru wrote:

Hello

I need to receive slice-based frames from a video server. These frames, as you 
know come by slices. The last slice (packet) comes with Mark=True in the RTP 
header.

  I have a class which receives the frames:

class VideoSink final : public MediaSink {}

It has afterGettingFrame() method which gets the frames and works well for 
usual frames. After getting frames I save them in archive and later send them 
to a receiver. So, when I send them, I need to set the Mark flag to say the 
receiver what is it - a intermediate slice or a last slice or a usual frame. 
But I don't know nothing about the Mark, because I receive only video payload.

So, how to get this flag, or is there other method to know about which slice 
comes?

In general, it's the job of the decoder to figure out how to render the 
incoming NAL units - which includes deciding when a received slice is the last 
slice in a video frame.

However, as a hint, you can use the value of the RTP packet's 'M' (i.e., 'marker') bit, 
which is (supposed to be) set for the last RTP packet of an 'access unit' (i.e., video 
frame).  I.e., you can call "RTPSource::curPacketMarkerBit()" to test this.


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/


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[Live-devel] Receiving slice-based frames

[d.gorde...@ngslab.ru]

Hello

I need to receive slice-based frames from a video server. These frames, 
as you know come by slices. The last slice (packet) comes with Mark=True 
in the RTP header.


 I have a class which receives the frames:

class VideoSink final : public MediaSink {}

It has afterGettingFrame() method which gets the frames and works well 
for usual frames. After getting frames I save them in archive and later 
send them to a receiver. So, when I send them, I need to set the Mark 
flag to say the receiver what is it - a intermediate slice or a last 
slice or a usual frame. But I don't know nothing about the Mark, because 
I receive only video payload.


So, how to get this flag, or is there other method to know about which 
slice comes?



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