[vlc-devel] Re: VLC Bug in v. 0.8.2: Jerky Menu DVD Playing in Windows II

John Michael Williams jwill at isp.com
Tue Jul 5 00:16:21 CEST 2005

Hi Benjamin.

Sorry; in my previous Email, I forgot to attach the
Messages files you wanted.

I've never looked at these messages before.

The jerky play prints messages constantly; the simple play
stops (at least for a minute or so) with the last message
in the file attached.

Perhaps the message writing is causing the jerking?
                      jwill at isp.com
                   John Michael Williams

> One guess:  Several forum posters, and I, have
> noticed this problem to occur on a newly-installed OS.
> Why, I don't know.  However, there may be some
> sort of OS feedback interacting with an adaptive
> parameter somewhere.
> No VLC option that I know of has had any noticeable effect
> on the problem, and I think I've tried them all.
> Answers to your questions below.
> Benjamin Pracht wrote:
>> On Sun, Jul 03, 2005, John Michael Williams wrote :
>>>You can get full detail on this bug, which has been
>>>confirmed by other users in Windows 2000 and Windows XP,
>>>under the forum title "VLC 0.8.2 Plays DVD w. Menues
>>>jerkily in Win2k".
>>>My most recent link to the web page is:
>> Well, that doesn't give any really usefull information to help find the
>> issue. It seems quite sepcific on some setups (contrary to what you seem
>> to think, we test our release at least a bit before releasing them...)
> Hmmm. My DVDs store several bits, though . . ..  Just kidding.
>> Could you please tell us what CPU you have on this comuter, the CPU
>> usage when the problem occur and copy here the content of the
>> View->message dialog ?
>> Thanks
> The computer is a Dell Optiplex GX260 with 2 GHz Pentium and 256 Megs
> RAM.  Almost 2 Gigs swap space.  It is permanently offline and not
> networked.  It is quiet during these tests with about 1/2 of
> RAM allocated.  Radeon VE graphics (4x AGP); 1280 x 1024 screen res.
> Testing with Godzilla DVD (ALL movie DVD's seem to show the
> problem):
> CPU usage during DVD simple averages around 25%
> (Task Mger; high refresh rate, watching graph), ranging from
> 5% to 30%.  There are no halts; DVD accesses occur at
> about 5/s.
> CPU usage during DVD menu jerky playing averages about twice
> as for simple, with more spread between user & kernel CPU time.
> The halts occur at the same frequency (about 2/s) as the DVD
> activity light.
> My guess is either a buffering or cacheing problem, or a
> menu-polling loop somewhere in VLC.  Maybe someone left a
> dtor empty somewhere?
> Because PowerDVD (which came with the computer) doesn't
> jerk with menus, I think a hardware deficiency is eliminated.

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