[linux-dvb] Re: The origin of the pts ?

[Johannes Stezenbach <js@convergence.de>]

Peter Maersk-Moller wrote:
> 
> Every now and then I seem to encounter PTS-values which seems to
> be less than their predecessor. As far as I remember, then the
> MPEG-2 TS is recreated by TT budget/Full card thus creating
> some of the header data on the-fly instead of just relaying data
> exact as it was recived. Is this correct ?

No.

> If yes, is the PTS
> then recreated by the DVB card or is it just relayed as-is ?

As-Is, except is your record the same video/audio PID on a av7110
based card which are currently being decoded (this is a hardware
limitation).

> The reason I'm asking is that every now and then I seem to get
> a PTS of a frame belonging in the past. See the log below, where I
> receive data with a TT Budget (NOVA-s), broadcast with dvbstream,
> receive and decode with libmpeg2 (in mp4live).

Frames are sent in decoding order, not in display order.
(which is different in the presence of B-frames).

Johannes