[linux-dvb] Re: Trying to get a ``polished'' MPEG stream from DVB

[Måns Rullgård <mru@pronto.tv>]

Chris Chatfield <C.Chatfield@Teamphone.com> writes:

>> > I can't be the only one trying to transcode DVB output. What does
>> > everyone else do?
>> 
>> I've been playing around with DVB a bit, never had any problems like
>> that.
> I can't offer a solution to the original problem, but at least I can explain
> briefly what's going on -
> DVB is transmitting over the air, and you'd be doing very well to get 100%
> of the TS packets. I suspect the OP had a moment of less than perfect
> reception at that point - hence a missing packet.

This is the reason TS uses fixed-size packets and other things that
make recovery easy.

> Transcode and other mpeg utilities generally expect a perfect mpeg stream.
> We're not able to supply one unless you convert the TS to mpeg with a
> utility that can cater for unreliable input.
>
> It's worse if you demultiplex the stream into separate audio and video
> streams before transcoding - a loss of a single audio frame can play havoc
> with a/v synchronisation.

Isn't that what PTS is for?

-- 
Måns Rullgård
mru@pronto.tv



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