[mythtv-commits] Ticket #3520: mtd assumes incorrect frame rate code

MythTV mythtv at cvs.mythtv.org
Tue May 29 02:31:34 UTC 2007

#3520: mtd assumes incorrect frame rate code
 Reporter:  anonymous  |       Owner:  awithers
     Type:  defect     |      Status:  new     
 Priority:  minor      |   Milestone:  0.21    
Component:  mythdvd    |     Version:  0.20    
 Severity:  medium     |  
 Nearly every (transcoded) rip I make of my son's DVDs have incorrect
 audio/video sync.  I have been dealing with this for two years, having my
 wife adjust the offset with the remote control - onto which I have mapped
 the sync adjust keys in lirc.

 After banging my head against the wall for a weekend, it turns out that
 the problem is that mtd gives -f0,1 for every encoding even though the
 frame rate is actually frc 4.

 Just removing the -f entirely allows transcode (e.g. tcprobe) to get this

 I see that dvdinput table defines frc 1 for '''all''' NTSC sources.  (And
 3 for all PAL).  This seems to be a hasty generalization.

 Many children's DVDs don't seem to fall into these categories.  Probably
 because they come from TV and not film.

 Also, I have found many pan/scan cheap kids releases of theatrical (e.g.
 the Babe/Babe2 double sided DVD) have the same problem.

 '''Summary - mythdvd is making an assumption that is breaking transcode's
 ability to autodetect and do the right thing...'''

 request - at least give us the option "don't override detected frame rate"
 a la the option of "use xvid instead of divx"

Ticket URL: <http://svn.mythtv.org/trac/ticket/3520>
MythTV <http://svn.mythtv.org/trac>

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