[mpeg2] Re: question about the mpex and vbv buffer and vbv delay

[Samuel Rivas <samuel@dc.fi.udc.es>]

Hi again Luca:
> > I wrote a little
> > program which simply looks for the PCRs and works the bit rate out
> > dividing the amount of bytes between each pair of consecutive PCRs by
> > the subtraction of those PCRs and it yields exactly 6000000 bits/seg
> > for all pairs of PCRs.
> I did something similar in the past, to verify that the TS bitrate is
> constant (and in fact, it is ;-). But I did not look at the video
> bitrate (I am just trusting the TS analyzer)... I'll try to have a look.
>
  Ops! I should read mails twice after replying. I didn't realize you
wrote VIDEO bitrate :(.

  Can the video bitrate be measured by means of DTSs? If it is I can
write a similar application but using PES and DTSs instead of ts packets
and PCRs. I've done something similar for program streams.

  I likely get round to do that this week, if so I'll drop some lines in
this list.

> >   I have other tool that says there is a small PCR jitter, but I don't
> > have the source and I have no idea about why is it saying that :(
> I suspect it is referring to the fact that the difference between two
> consecutive PCR values is not constant, but oscillates between 40.35ms
> and 41.36ms. Anyway, the PCR does not have to be periodic, hence this is
> not a problem (I think).

  Yes, it should be. In fact, it says there is about 1 ms of average

  Regards
-- 
	Samuel