I have a wmv file that has played just fine for over a year. I use it in a
powerpoint presentation.

Suddenly it started playing jerky - the audio is fine but the video starts
and stops at random.

First, the environment:
a. XP Professional, SP2
b. Nothing else running on the system per the task manager.
c. On task manager, media player shows between 45 and 60 % CPU while playing
the movie.
d. Running Norton 360.

I upgraded to WMP 11 - didn't help.

I thought maybe the file was corrupted so I renamed the old file and made a
fresh copy from another computer. Didn't help.

I noticed that if I play the movie a second time (replay) it isn't jerky...
it's only jerky the first time that I play it. I then discovered that all of
my clips are the same - jerky the first time but not the second time.

AHA! A buffering problem! I enlarged the read-ahead buffer to 20 seconds.
Didn't help.

I'm stumped.

What could have changed, even by mistake, that could be causing this? Could
Windows Update have changed something on me? Or a Norton update?

Re: Jerky playback by Frank

Frank
Thu Apr 24 11:32:00 PDT 2008

Do you still need help with this?

On March 27, AuthorCancerForTwo <AuthorCancerForTwo@discussions.microsoft.com>
wrote:
> I have a wmv file that has played just fine for over a year. I use it in a
> powerpoint presentation.
>
> Suddenly it started playing jerky - the audio is fine but the video starts
> and stops at random.
>
> First, the environment:
> a. XP Professional, SP2
> b. Nothing else running on the system per the task manager.
> c. On task manager, media player shows between 45 and 60 % CPU while playing
> the movie.
> d. Running Norton 360.
>
> I upgraded to WMP 11 - didn't help.
>
> I thought maybe the file was corrupted so I renamed the old file and made a
> fresh copy from another computer. Didn't help.
>
> I noticed that if I play the movie a second time (replay) it isn't jerky...
> it's only jerky the first time that I play it. I then discovered that all of
> my clips are the same - jerky the first time but not the second time.
>
> AHA! A buffering problem! I enlarged the read-ahead buffer to 20 seconds.
> Didn't help.
>
> I'm stumped.
>
> What could have changed, even by mistake, that could be causing this? Could
> Windows Update have changed something on me? Or a Norton update?

Re: Jerky playback by AuthorCancerForTwo

AuthorCancerForTwo
Thu Apr 24 12:24:06 PDT 2008

Yes, I do!

I have tried using the PowerPoint Viewer, but the playback is still jerky,
although the buffering thing still seems to fix the problem. That doesn't
help me, though, because I can't buffer the video during my presentation.

"Frank Slootweg" wrote:

> Do you still need help with this?
>
> On March 27, AuthorCancerForTwo <AuthorCancerForTwo@discussions.microsoft.com>
> wrote:
> > I have a wmv file that has played just fine for over a year. I use it in a
> > powerpoint presentation.
> >
> > Suddenly it started playing jerky - the audio is fine but the video starts
> > and stops at random.
> >
> > First, the environment:
> > a. XP Professional, SP2
> > b. Nothing else running on the system per the task manager.
> > c. On task manager, media player shows between 45 and 60 % CPU while playing
> > the movie.
> > d. Running Norton 360.
> >
> > I upgraded to WMP 11 - didn't help.
> >
> > I thought maybe the file was corrupted so I renamed the old file and made a
> > fresh copy from another computer. Didn't help.
> >
> > I noticed that if I play the movie a second time (replay) it isn't jerky...
> > it's only jerky the first time that I play it. I then discovered that all of
> > my clips are the same - jerky the first time but not the second time.
> >
> > AHA! A buffering problem! I enlarged the read-ahead buffer to 20 seconds.
> > Didn't help.
> >
> > I'm stumped.
> >
> > What could have changed, even by mistake, that could be causing this? Could
> > Windows Update have changed something on me? Or a Norton update?
>

Re: Jerky playback by AuthorCancerForTwo

AuthorCancerForTwo
Thu Apr 24 12:28:07 PDT 2008

I also tried disabling Norton 360... that didn't help either.



"Frank Slootweg" wrote:

> Do you still need help with this?
>
> On March 27, AuthorCancerForTwo <AuthorCancerForTwo@discussions.microsoft.com>
> wrote:
> > I have a wmv file that has played just fine for over a year. I use it in a
> > powerpoint presentation.
> >
> > Suddenly it started playing jerky - the audio is fine but the video starts
> > and stops at random.
> >
> > First, the environment:
> > a. XP Professional, SP2
> > b. Nothing else running on the system per the task manager.
> > c. On task manager, media player shows between 45 and 60 % CPU while playing
> > the movie.
> > d. Running Norton 360.
> >
> > I upgraded to WMP 11 - didn't help.
> >
> > I thought maybe the file was corrupted so I renamed the old file and made a
> > fresh copy from another computer. Didn't help.
> >
> > I noticed that if I play the movie a second time (replay) it isn't jerky...
> > it's only jerky the first time that I play it. I then discovered that all of
> > my clips are the same - jerky the first time but not the second time.
> >
> > AHA! A buffering problem! I enlarged the read-ahead buffer to 20 seconds.
> > Didn't help.
> >
> > I'm stumped.
> >
> > What could have changed, even by mistake, that could be causing this? Could
> > Windows Update have changed something on me? Or a Norton update?
>

Re: Jerky playback by Frank

Frank
Thu Apr 24 13:29:00 PDT 2008

Oops! Sorry! I thought this was for audio(-only) files, but I see that
it's for video+audio files.

Anyway, *perhaps* the cause is the same as I had (also on XP
Professional, SP1 or 2 (I don't remember)), lack of System cache for
buffering.

Try this:

Control Panel -> System -> Advanced -> Performance -> Settings ->
Advanced -> Memory usage. If it is set to "Programs", change it to
"System cache". If I remember correctly, you have to reboot to make the
change effective.

I hope this helps.

AuthorCancerForTwo <AuthorCancerForTwo@discussions.microsoft.com> wrote:
> Yes, I do!
>
> I have tried using the PowerPoint Viewer, but the playback is still jerky,
> although the buffering thing still seems to fix the problem. That doesn't
> help me, though, because I can't buffer the video during my presentation.
>
> "Frank Slootweg" wrote:
>
> > Do you still need help with this?
> >
> > On March 27, AuthorCancerForTwo
> > <AuthorCancerForTwo@discussions.microsoft.com> wrote:
> > > I have a wmv file that has played just fine for over a year. I
> > > use it in a powerpoint presentation.
> > >
> > > Suddenly it started playing jerky - the audio is fine but the
> > > video starts and stops at random.
> > >
> > > First, the environment:
> > > a. XP Professional, SP2
> > > b. Nothing else running on the system per the task manager.
> > > c. On task manager, media player shows between 45 and 60 % CPU
> > > while playing the movie.
> > > d. Running Norton 360.
> > >
> > > I upgraded to WMP 11 - didn't help.
> > >
> > > I thought maybe the file was corrupted so I renamed the old file
> > > and made a fresh copy from another computer. Didn't help.
> > >
> > > I noticed that if I play the movie a second time (replay) it isn't
> > > jerky... it's only jerky the first time that I play it. I then
> > > discovered that all of my clips are the same - jerky the first
> > > time but not the second time.
> > >
> > > AHA! A buffering problem! I enlarged the read-ahead buffer to 20
> > > seconds. Didn't help.
> > >
> > > I'm stumped.
> > >
> > > What could have changed, even by mistake, that could be causing
> > > this? Could Windows Update have changed something on me? Or a
> > > Norton update?

Re: Jerky playback by AuthorCancerForTwo

AuthorCancerForTwo
Thu Apr 24 14:01:02 PDT 2008

Thanks, Frank, but I tried what you suggested and it didn't make any
difference.

Back to the drawing board!!



"Frank Slootweg" wrote:

> Oops! Sorry! I thought this was for audio(-only) files, but I see that
> it's for video+audio files.
>
> Anyway, *perhaps* the cause is the same as I had (also on XP
> Professional, SP1 or 2 (I don't remember)), lack of System cache for
> buffering.
>
> Try this:
>
> Control Panel -> System -> Advanced -> Performance -> Settings ->
> Advanced -> Memory usage. If it is set to "Programs", change it to
> "System cache". If I remember correctly, you have to reboot to make the
> change effective.
>
> I hope this helps.
>
> AuthorCancerForTwo <AuthorCancerForTwo@discussions.microsoft.com> wrote:
> > Yes, I do!
> >
> > I have tried using the PowerPoint Viewer, but the playback is still jerky,
> > although the buffering thing still seems to fix the problem. That doesn't
> > help me, though, because I can't buffer the video during my presentation.
> >
> > "Frank Slootweg" wrote:
> >
> > > Do you still need help with this?
> > >
> > > On March 27, AuthorCancerForTwo
> > > <AuthorCancerForTwo@discussions.microsoft.com> wrote:
> > > > I have a wmv file that has played just fine for over a year. I
> > > > use it in a powerpoint presentation.
> > > >
> > > > Suddenly it started playing jerky - the audio is fine but the
> > > > video starts and stops at random.
> > > >
> > > > First, the environment:
> > > > a. XP Professional, SP2
> > > > b. Nothing else running on the system per the task manager.
> > > > c. On task manager, media player shows between 45 and 60 % CPU
> > > > while playing the movie.
> > > > d. Running Norton 360.
> > > >
> > > > I upgraded to WMP 11 - didn't help.
> > > >
> > > > I thought maybe the file was corrupted so I renamed the old file
> > > > and made a fresh copy from another computer. Didn't help.
> > > >
> > > > I noticed that if I play the movie a second time (replay) it isn't
> > > > jerky... it's only jerky the first time that I play it. I then
> > > > discovered that all of my clips are the same - jerky the first
> > > > time but not the second time.
> > > >
> > > > AHA! A buffering problem! I enlarged the read-ahead buffer to 20
> > > > seconds. Didn't help.
> > > >
> > > > I'm stumped.
> > > >
> > > > What could have changed, even by mistake, that could be causing
> > > > this? Could Windows Update have changed something on me? Or a
> > > > Norton update?
>