Opened 12 years ago

Closed 11 years ago

#4893 closed defect (invalid)

Problems skipping with certain MPEG streams

Reported by: anonymous Owned by: Isaac Richards
Priority: major Milestone: unknown
Component: Video Playback Version: 0.21-fixes
Severity: medium Keywords:
Cc: Ticket locked: no

Description

This ticket is a spinoff of #3773 since the fix for 3773 did improve the situation somewhat but didn't fix the problem totally. I will submit a new log and sample MPEG file when I get a few minutes.

The problem is still with certain SD firewire channels that exhibit a few symptoms:

  • audio and vidio are usually not in sync
  • skipping forward and sometimes backward exacerbates the problem resulting in choppy video and/or audio and audio errors in the log
  • sometimes, playing the file from the beginning with no skipping works fine and is watchable

More details to come.

Change History (7)

comment:1 Changed 12 years ago by mark@…

I get this same behavior. Only in SD channels via firewire. HD channels are fine. I see around a 1 second delay on sound. All profiles tested ( stock and custom), none help.

comment:2 Changed 12 years ago by mark@…

I am seeing this on the release version of .21 BTW.

comment:3 Changed 12 years ago by curtis@…

OK, when I play one of these files I get these messages repeatedly in the log (using -v playback):

2008-03-15 11:09:05.057 NVP: Video is 30 frames ahead of audio,
			doubling video frame interval to slow down.
2008-03-15 11:09:05.123 NVP: Video is 30 frames ahead of audio,
			doubling video frame interval to slow down.
2008-03-15 11:09:05.189 NVP: Video is 30 frames ahead of audio,
			doubling video frame interval to slow down.

comment:4 Changed 12 years ago by curtis@…

Usually when I start the file playing, it is OK, with no messages in the log. It's when I skip forward or back that the messages above start occurring.

comment:5 Changed 12 years ago by curtis@…

You can find a 250M sample of a problem mpg file at

http://stanfordcomputing.com/bad4893.mpg

comment:6 Changed 11 years ago by stuartm

Component: mythtvVideo Playback
Version: unknown0.21-fixes

comment:7 Changed 11 years ago by danielk

Resolution: invalid
Status: newclosed

sample file missing.

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