[Live-devel] 回覆: H264 + ulaw streaming with audio vibration

[Eric_Hsieh at alphanetworks.com]

Hi Ross,

Thanks for your quickly replay again.

Yes, according to your suggestion.
fDurationInMicroseconds = 256*1000000/ 16000 = 16000
The 16000 is same with what I mention early.
So, I am very confusing about the audio vibration.
Thanks a lot.

regards, eric, 12/17
________________________________________
從: live-devel <live-devel-bounces at ns.live555.com> 代表 Ross Finlayson <finlayson at live555.com>
寄件日期: 2015年12月17日 下午 07:26
至: LIVE555 Streaming Media - development & use
主旨: Re: [Live-devel] H264 + ulaw streaming with audio vibration

> Each time, we will put 1024 bytes to ulaw encode and it produce 512 bytes ulaw data out.
> Then we copy 512 bytes to fTo and put 512 to fFrameSize.
> For fDurationInMicroseconds, we set 16000.
> I think it should be right. But I don’t know why 16K, stereo audio is not working.

Note that, for stereo, each sample is double the size of an audio sample. Therefore, 1024 bytes of mono PCM is 512 samples, but 1024 bytes of stereo PCM is 256 samples.  Therefore, you should set
        fDurationInMicroseconds = 512*1000000/<sampling-frequency>
for mono, and
        fDurationInMicroseconds = 256*1000000/<sampling-frequency>
for stereo.


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


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