[M4IF Technotes] synchronization between streams

[Herbert Thoma]

Gaofeng Yue schrieb:
> 
> Hi, all,
> 
> I have some questions about synchronization between streams in MPEG4.
> Suppose a host has an audio source and a video source, my questions are :
> 1. After video and audio being encoded, they are transmitted as
> individual streams? or they are multiplexed into a composite stream and
> delivered through the network as a single stream?

Both is possible. However, the most common way to stream MPEG-4 today
defined by the ISMA (http://www.isma.tv) uses individual streams.
> 2. At the receiver, how the synchronization between the audio and video
> stream is implemented?

Each MPEG-4 Access Unit gets a timestamp attached. The decoder uses these
timestamps for synchornization.
 Herbert.
> Thanks for your help.
> 
> Gaofeng
> 
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-- 
Herbert Thoma
FhG-IIS A, Studio Department
Am Weichselgarten 3, 91058 Erlangen, Germany
Phone: +49-9131-776-323
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email: tma   iis.fhg.de
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