[vlc] Exact meaning and cause of error messages

[Måns Rullgård]

I'm writing a program for streaming MPEG-TS data over UDP.  It's
mostly working, but VLC doesn't always like my streams.  It plays fine
for a while, but at some places (always the same point in the stream),
it prints a load of error messages, drops a couple of seconds of the
stream, and goes on playing.  I'd like to know what is wrong with my
stream that triggers these errors.  If I increase the UDP cache size
to 3000 ms (from the default 300) the errors go away.

The messages in question are these:

main warning: late picture skipped (8805)
main warning: late picture skipped (26695)
main warning: late picture skipped (19397)
main warning: late picture skipped (28621)
main warning: late picture skipped (35612)
main warning: PTS is out of range (-34474), dropping buffer
main warning: output PTS is out of range (3439), clearing out
main warning: input PTS is out of range (22699), trashing
main warning: buffer is 57362 in advance, triggering downsampling
main warning: output date isn't PTS date, requesting resampling (45519)
main warning: late picture skipped (52523)
main warning: late picture skipped (38875)
main warning: late picture skipped (42392)
main warning: late picture skipped (46389)
main warning: late picture skipped (50300)
main warning: late picture skipped (54298)
main warning: late picture skipped (59583)
main warning: late picture skipped (88258)
main warning: computed PTS is out of range (57305), clearing out
main warning: timing screwed, stopping resampling
main warning: PTS is out of range (45769), dropping buffer
main warning: output PTS is out of range (66327), clearing out
main warning: PTS is out of range (19400), dropping buffer
main warning: PTS is out of range (-6708), dropping buffer
main warning: PTS is out of range (-32815), dropping buffer
main warning: output date isn't PTS date, requesting resampling (-41709)
main debug: stream periodicity changed from P[43] to P[49]
main debug: decoded 144/144 pictures
main warning: late picture skipped (136202)
main warning: late picture skipped (127568)
main warning: late picture skipped (154090)
main warning: computed PTS is out of range (139716), clearing out

It goes on in the same spirit for a while, before it goes back to the
normal debug messages.

I'd be thankful for any help with determining the cause of these
errors.

-- 
Måns Rullgård
mru at users.sf.net
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