[vlc] Re: Debug error messages

[Laurent Aimar]

On Thu, Apr 14, 2005, Måns Rullgård wrote:
> Are these transport streams?
> > Error 1:
> > main warning: backward_pts != current_pts (-40000)
> > main debug: stream periodicity changed from P[5] to P[3]
> > main warning: output date isn't PTS date, requesting resampling (62870)
> > main warning: buffer is 60704 late, triggering upsampling
> > main warning: PTS is out of range (-7266), dropping buffer
> > main warning: PTS is out of range (-30044), dropping buffer
> > main warning: output date isn't PTS date, requesting resampling (42453)
> > main warning: buffer is 60685 late, triggering upsampling
> >
> > Now I'm assuming this refering to the PTS time-stamps jumping
> > backwards in time occasionally. Likely causes of this being packets
> > delivered out of order, or possibly dropping some packets
> 
> Those errors usually indicate bad PCR values in the TS.
 It can be bad PCR value or bad pts/dts value.

> > Error 2:
> > main warning: late picture skipped (173512)
> > main warning: late picture skipped (133512)
> > main warning: late picture skipped (92089)
> > main warning: late picture skipped (52089)
 Too slow computer or bad PCR or to late/slow delivery.

> > Error 8:
> > main debug: stream periodicity changed from B[1] to B[2]
> > main debug: stream periodicity changed from P[5] to P[3]
> > main debug: stream periodicity changed from P[6] to P[3]
> > main debug: stream periodicity changed from P[3] to P[4]
> > main debug: stream periodicity changed from P[4] to P[3]
> > main debug: stream periodicity changed from P[3] to P[4]
> >
> > Can you confirm what this error indicates.
> 
> Not an error.
 It just means that the mpeg doesn't use a fixed gop (I think we should remove
this message).

> The exact *meaning* of those error remains a mystery.  I have been
> asking occasionally for a couple of years, and have yet to receive any
> answer.
 Is your question : "why bad PCR leads to thoses messages ?"

-- 
fenrir

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