[linux-dvb] Re: Determining transport stream bitrate.

[Jens Thomsen <MisfitsPlan9@access-4-free.com>]

Franck Arnaud wrote:

> Jens Thomsen:
>  
> > This sohuld work:
> >
> > 	bits of PID/(total bits in stream/stream bitrate)
> >
> > because (correct me if I'm wrong):
> >
> > 	(total bits in stream/stream bitrate) = number of seconds in TS thus far
> >    
> but how do you know the stream bitrate? is it constant? I guess not, 
> eg when a part time channel stops, the actual bitrate (post FEC) is 
> going to go down.
>
> Why don't you record the time when you started recording and 
> compare it with the time when the recording finished, which you 
> can get with the stat command (last modif time).
>
>
>
>  
Actually in my case the total bitrate is constant. I am using streams 
from US terrestrial broadcasts.  These streams are subject to the 
regulation of the FCC and ATSC which mandate that a broadcaster can 
utilize no more than 19.392658 Mb/s.  The otherr reason that I can't use 
time stamps is because I am trying to give the bitrate of the PID at the 
very moment that I see the packet.

   Jens



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