[linux-dvb] TS Stream - null packets generation?

Thomas Pinz dc2rpt at gmx.de
Tue Oct 3 14:56:51 CEST 2006


Hi, 

On Tuesday 03 October 2006 10:29, Chun Chung Lo wrote:
> I am now using a STB (under development) which its hardware
> configuration is:
And if you are using GPL'd software, of course you are considering the legal 
sitation ?  [1]

> When I capture the TS stream (which is stream out by a DVB-T modulator),
> and compare the file with the original one, I found tones of NULL
> packets (which its header is 0x47 0x1F, 0xFF 0x10, and remains are 0x00
> ... Until the end of a TS packets, 188bytes).
> And where are the TS null packets come from?
Thats called bit-stuffing and is simply very normal in any DVB signal. 

Your video/audio/data-stream in your DVB-signal is coded at a variable data 
rate, depending on the content. The channel capacity of the desired 
DVB-channel is fixed. And so the unused part of the capacity is simply filled 
with Null-Packets. 
But this should be also described in the manual of your modulator. 

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Could you describe this a little bit more in detail ? Should i read this mail 
or not ? Do you need an answer to your question or not ? And please describe 
which different laws are you meaning ? 


Kind regards, 

Thomas 

[1]: Btw, does anybody know a translation of the GPL to the common asian 
languages ? Or is this not possible due missing vocabulary ? 



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