On Monday 17 March 2008 03:12, Bryan Henderson wrote:
> I'm working to get Mplayer to do closed captions with IVTV embedded
> VBI (MPEG) input, and have encountered a problem with the PTS
> timestamps in the VBI packets. The timestamps are referenced to some
> arbitrary time rather than the beginning of the program, while the
> timestamps in the audio and video stream do appear to be referenced
> to the beginning of the program (open time, I guess). The VBI
> timescale apparently spans open/close.
>
> What would cause that? Where does the time come from?
I have noticed the same thing. The PTS comes from the firmware, but the
VBI PTS and the audio/video PTS have an offset. I am working on the
whole VBI capturing part of the driver and I'll take a look at this as
well. I might be able to fairly simply adjust the VBI PTS so that it is
in sync with the A/V PTS.
>
> I'm using IVTV 0.4.10 with PVR-250 NTSC.
>
> Also, how important is it for the streams to have separate time
> scales? I mean, if an audio, a video, and a VBI packet come out of
> the IVTV MPEG device at the same time, can I just assume they go
> together?
Yes.
Regards,
Hans
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