[linux-dvb] DVB file formats

Felix Domke tmbinc at elitedvb.net
Thu Jun 16 17:26:20 CEST 2005


Andrew de Quincey wrote:
> What do you think of the pmt_extra idea I've just added to the wiki page?
> (BTW the URL is http://www.linuxtv.org/wiki/index.php/File_Format_Comparison 
> in case anyone missed it the first time/has lost it in the meantime)
I like the idea, though I have a comment to the zap_pids first:
I don't like the special order of these, as for example, a service could
use DTS (right now there are only test streams), and then we need to fix
the file format, which we of course want to avoid.

So why not use a pid:type there, like for pmt_extra?

A problem i see for the pmt_extra is that it can never represent a full
PMT entry (for example: CA descriptors). But i don't think we should
want this, as i can't image something useful.

However, just using the PMT-type won't work. AC3 channels have the same
type as Videotext ("private" iirc.), and for DTS you have a descriptor
with an ascii ID.

We still need some per-service "flags", for example to disable PAT/PMT
parsing (to rely only on the pmt_extra stuff).

Felix




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