[Ffmpeg-devel] mpegts pid values

Erik Slagter erik
Wed Aug 10 12:51:15 CEST 2005

On Wed, 2005-08-10 at 11:06 +0100, M?ns Rullg?rd wrote:
> > BTW do you know why:
> >
> >  - so many bits are reserved for the pid in a ts (16 bits?)
> It's 13 bits.  I don't know why this size was chosen.

Maybe they just had a few bits spare ;-)

> >  - often very high numbers are used
> The exact numbers used has no significance.  High or low doesn't matter.
> >  - still many pid's are used over and over in different ts's.
> Why not?  There is no coordination among broadcasters, and there would be
> no point in having anything like that.

My exact observation is that a single provider, who uses several
transponders, tends to use the same (very randomly chosen) pids in the
various ts's. So apparently they are just the provider's lucky
numbers ;-)
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