Kdenlive - KDE Non Linear Video Editor

On Thursday 27 Nov 2003 2:28 pm, Jelte Liebrand wrote:
> Hiya,
>
> Just wondered if anybody else is seeing problems of the clips running at
> (what looks like) twice the normal speed. I haven't found one clip that
> actually works for me (running Knoppix / debian).
>
> Jason, did you not mention you saw this on the latest mandrake as well?

Yes, I have just done a little experimentation. The same problem occurs in 
pplay (one of the utilities that comes with piave - it doesn't get installed, 
but can be run directly from the /piave/utils folder.)

On my machine, it appears that the problem occurs because artsd is not 
running, although when I start it, I then get different sound issues - the 
sound stutters and is interspersed with white noise.

If I run pplay, I get the following line :

artsstream.cc:109 WARNING: failed to initialize aRts: can't connect to aRts 
soundserver

followed by hundreds of the following line :

ossstream.cc:278 WARNING: writing to /dev/dsp result=-1

Any thoughts, Rolf?

Cheers,
Jason

-- 
Jason Wood
Homepage : http://www.uchian.pwp.blueyonder.co.uk

Hi,

I have also experienced some timing isuues since I switched to new kernel+ALSA 
I try to look into it. but anyway, if aRts is running, the output plugin 
should be able to connect to the aRts server. did you try if aRts is really 
running with explicitly using the xmms aRts output plugin?

Cheers, Rolf

On Thursday 27 November 2003 06:50, Jason Wood wrote:
> On Thursday 27 Nov 2003 2:28 pm, Jelte Liebrand wrote:
> > Hiya,
> >
> > Just wondered if anybody else is seeing problems of the clips running at
> > (what looks like) twice the normal speed. I haven't found one clip that
> > actually works for me (running Knoppix / debian).
> >
> > Jason, did you not mention you saw this on the latest mandrake as well?
>
> Yes, I have just done a little experimentation. The same problem occurs in
> pplay (one of the utilities that comes with piave - it doesn't get
> installed, but can be run directly from the /piave/utils folder.)
>
> On my machine, it appears that the problem occurs because artsd is not
> running, although when I start it, I then get different sound issues - the
> sound stutters and is interspersed with white noise.
>
> If I run pplay, I get the following line :
>
> artsstream.cc:109 WARNING: failed to initialize aRts: can't connect to aRts
> soundserver
>
> followed by hundreds of the following line :
>
> ossstream.cc:278 WARNING: writing to /dev/dsp result=-1
>
> Any thoughts, Rolf?
>
> Cheers,
> Jason

-- 
contacts: http://www.physi.uniheidelberg.de/~dubitzky

On Thursday 27 Nov 2003 7:51 pm, Rolf Dubitzky wrote:
> Hi,
>
> I have also experienced some timing isuues since I switched to new
> kernel+ALSA I try to look into it. but anyway, if aRts is running, the
> output plugin should be able to connect to the aRts server. did you try if
> aRts is really running with explicitly using the xmms aRts output plugin?

Ok, for me the does seem to have been cleared up by changing my arts setup so 
that it works (I think the autodetection was going a little bit screwy, 
forcing it to use ALSA works and doesn't give me the white noise effect, 
which was indeed occurring on everything using arts, not just piave.).

I have noticed something interesting - if the arts buffer size is set too 
large (not recommended for video editing anyway), piave starts to play the 
video more slowly, which in turn seems to cause the audio to stutter. Setting 
the buffer size too small also makes the sound stutter - although that is the 
obvious one, where presumably arts cannot feed the sound card fast enough.

For information, my kernel is currently the Mandrake "multimedia" kernel, 
which I thought would be interesting to try out. I am not convinced that it 
is any better than the normal Mandrake kernel; to me it actually feels slower 
than the normal kernel.

Cheers,
Jason

-- 
Jason Wood
Homepage : http://www.uchian.pwp.blueyonder.co.uk

On Thursday 27 November 2003 12:50, Jason Wood wrote:
> Ok, for me the does seem to have been cleared up by changing my arts setup
> so that it works (I think the autodetection was going a little bit screwy,
> forcing it to use ALSA works and doesn't give me the white noise effect,
> which was indeed occurring on everything using arts, not just piave.).

Ok, that is consistent with my experience. Since I just started using ALSA 
(with current versions 2.4.23 and 2.6.0) and I already like it ;-) I think 
I'll add a native ALSA output plugin. I usually don't use aRts since I have 
all kinds of troubles with aRts.  Some of my most used programs like 
gnomemeeting (ok, that's gnome and not likely to work with aRts) but also 
kphone (which is a KDE program) don't work with aRts so I stopped using it.

> I have noticed something interesting - if the arts buffer size is set too
> large (not recommended for video editing anyway), piave starts to play the
> video more slowly, which in turn seems to cause the audio to stutter.
> Setting the buffer size too small also makes the sound stutter - although
> that is the obvious one, where presumably arts cannot feed the sound card
> fast enough.

Hmm.. interesting..

Cheers, Rolf

-- 
contacts: http://www.physi.uniheidelberg.de/~dubitzky