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[linux-dvb] FF cards alter PTS'?
- To: linux-dvb@linuxtv.org
- Subject: [linux-dvb] FF cards alter PTS'?
- From: Pekka Virtanen <pekka.virtanen@sci.fi>
- Date: Sat, 15 Nov 2003 15:35:25 +0200
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Hi,
I have two computers, one with Full featured DVB-C the other with a
Budget DVB-C. I ran the same software on both computers, on the same
channel and the same time of course.
The software prints the video PTS on the console. The results are below:
FF DVB-C:
video pts = 5581899604
video pts = 5581942804
video pts = 5581986004
video pts = 5588682004
[...]
BUDGET DVB-C
video pts = 7682452818
video pts = 7682496018
video pts = 7682539218
video pts = 7682582418
[...]
The BUDGET results correspond to the subtitles PTS (I'm trying to sync
subtitles).
On FF DVB-C video pts << subtitle pts, so the synchronization does not
work. I'm using STC for syncing but it's about the same as the video pts.
What's going on here? Why are the pts / stc altered on a full featured
card? Does the card itself modify the pts values or the driver? Can I
somehow modify the subtitle pts' to match the stc?
And to make things more complicated, this doesn't happen always. I
haven't figured out the circumstances that cause this.
Any help is appreciated...
Thanks,
--pekka
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