[MPlayer-users] -ss in DVD broken ?

[Fabien Perdu]

> No, that's the automatic answer as it says :)

Ah, cool...

> I don't remember seeing mails about your problems.

Then it probably got lost.
Here it is again.
To be more precise, it is not a matter of seconds and keyframes,
it is a matter of tens of minutes.

Hello guys.

First thank you very much for this wonderful piece of code that
allows me to use my linux box for video watching.

Now the real stuff :
I am using rc3.
I am trying to use the -ss switch with DVDs.
I wanted to encode pieces of a DVD separately to be able to burn them
on separate CDs afterwards (for my own use, of course!)
so I tried
 mencoder -dvd 1 -endpos 4000 -o CD1.avi -otheroptions
 mencoder -dvd 1 -ss 4000 -o CD2.avi -otheroptions
The big surprise is that the end of CD1.avi does not match at all the
beginning of CD2.avi
Then I tried to understand this by playing back the files with mplayer,
and I discovered that
 mplayer CD1.avi -ss 1000 -otheroptions and
 mplayer -dvd 1 -ss 1000 -otheroptions
do NOT play the same part of the movie !!

What's more, running mplayer -dvd 1 -ss 1000 -otheroptions,
the time shown is the status line is not 1000, as well as the time
shown in the OSD.

Digging further, I found also that
 mplayer -dvd 1 -identify
doesn't give the right ID_LENGTH for the DVD title (too short).

Trying mith another DVD didn't give better results. Namely, they are
"Le pacte des loups" and "Le voyage de Chihiro".
I use -ao alsa9 -vo xv for watching,
-ovc lavc -lavcopts mpeg4:vhq:vbitrate=somerate -oac copy -vop scale=640:360
for encoding.

Is there a known problem with -ss on DVDs, or with the calculation of
the length of a DVD title ?

-- 
               ___                              _...__ 
            .-'   '--._                       .'_     '-.
          .'     .--._ '-._                 .'.' \       '.
         /      /__   `'.  '.              / /    `\       \
        /      /   '-.    `\ \           /'/'       \      |
        |     |       '.    `\`\        / /     _.-'|      |
        |     |         \     \ \      / /    .'    |      /
         \    /          '.   | |,-~-,/ /   .'      \     /
          '--'           __\               /__       '._.'
                       ."  '.             .'  ".    4, rue de l'Isère
 fabien.perdu at m4x.org  |      '.       .'      |    38000 Grenoble   
04 76 28 40 00 (bureau) \ ',    '.   .'    .' /     04 76 47 05 76
   -> poste 43 44       /'-.""-._ \ / _.-"".-'\     06 63 51 86 42
             _.=='''--,/ '/_.--._\'V'/_.--._\' \,--'''--._
           .'            _'-.__0_;\ /;_0__.-'_ '          '.
          /     ,____..-'\'.      """      -'/'--..____,    \
         /     '          \       .=.       /          `     \
         |             __  '-.   .-=-.   .-'  __             |
          \      _.--''  ''---'. .-=-. .'---''  ''--._      /
           '----'            .-'  ___  '-.            `----'
                            (    '   '    )
                             '.    _    .'
                               '--/ \--'
                                  |#|
                                  \_/