Re: [mythtv-users] timestretch results in chipmunk sound

2005-03-06 Thread Gabe Rubin
> am I right in thinking that?

No, it works (not currently for me) by adjusting the pitch.  When it
works right, it is very cool!

>From the official mythtv page:
"Timestretch". Though, it's really 'time-compression'. This allows the
user to adjust the playback speed slightly, but keeps the audio at the
same pitch. If you're recording a lot of shows, timestretch lets you
get through them faster. =)

>From the unofficial wiki:
New Feature (libsoundtouch)
*  A new library has been integrated which allows the playback
speed to be increased or decreased without causing a pitch shift. This
allows folks short on time to increase the playback speed to something
like 1.5x and finish a show quicker, without feeling like they're
listening to the chipmunks.
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Re: [mythtv-users] timestretch results in chipmunk sound

2005-03-06 Thread Jeff Simpson
I don't see how on earth that's possible.

to stretch audio like that you have to cut time out instead of playing
it faster. And with slowing it down you have to extrapolate and add
extra time in to make it slower. To do that I'm pretty sure you'd need
to demux the mpeg and alter just the audio while playing the video at
an altered speed. I think the audio stays muxed right in when you use
the PVR-350 as input and output.

am I right in thinking that?

On Sun, 6 Mar 2005 14:52:41 -0500, Gabe Rubin <[EMAIL PROTECTED]> wrote:
> On Sun, 6 Mar 2005 13:46:32 -0600, Jeff Simpson <[EMAIL PROTECTED]> wrote:
> > I'm not sure what everyone means by "chipmunks". If it's referring to
> > how all the voices sound higher in pitch, its normal - When you play
> > audio faster, it's going to sound like that due to the frequency
> > shift. Just like how when you play it at 0.5X it's going to sound like
> > it's being acted by James Earl Jones.
> >
> The timestretch feature of .17 is supposed to elimate the chipmunk
> sound and make it sound normal.  I am not sure how the developers
> accomplished, but it is brilliant when it works.  I have seen and
> heard it working on my FC1 system.  This is the one thing that has not
> worked properly after the upgrade to FC2, in other words, I have
> chipmunks.
> 
> 
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Re: [mythtv-users] timestretch results in chipmunk sound

2005-03-06 Thread Gabe Rubin
On Sun, 6 Mar 2005 13:46:32 -0600, Jeff Simpson <[EMAIL PROTECTED]> wrote:
> I'm not sure what everyone means by "chipmunks". If it's referring to
> how all the voices sound higher in pitch, its normal - When you play
> audio faster, it's going to sound like that due to the frequency
> shift. Just like how when you play it at 0.5X it's going to sound like
> it's being acted by James Earl Jones.
> 
The timestretch feature of .17 is supposed to elimate the chipmunk
sound and make it sound normal.  I am not sure how the developers
accomplished, but it is brilliant when it works.  I have seen and
heard it working on my FC1 system.  This is the one thing that has not
worked properly after the upgrade to FC2, in other words, I have
chipmunks.
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Re: [mythtv-users] timestretch results in chipmunk sound

2005-03-06 Thread Gabe Rubin
> I love that feature and the fastforward feature, however, much nicer
> than the skip! (especially how the extreme fast forward skips back a
> little automatically when you stop it, assuming that the human reflex
> is slower than needed to stop fast forwarding when needed)
> 

That skip back is configurable in the setup menu.  I forget where, but
i have seen it there.  I actually leave it on as it is accurate to my
reflexes.

I am interested in how you have it set up for time stretch with a
PVR-350 and no chipmunks?  I had it working fine under FC1 but not
under FC2.  Can you tell me your set-up, and maybe clue me into what
to do?  I love that feature, but it was a tease to have it working for
only a week.

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Re: [mythtv-users] timestretch results in chipmunk sound

2005-03-05 Thread Jeff Simpson
Time stretch works in very weird ways on my system (with a PVR-350)

- If I pick 0.5X it works fine (usually). If I pick anywhere between
0.5X and 1.0X, it goes exactly 1X

- If I pick 1.05X or anything faster, it goes REALLY fast. The jump
between 1.00X and 1.05X is WAY more than that percentage.

- Changing between 1.05X and 2.00X does change speed faster and
slower, but only slightly.

I did the math out and found that a 30s commercial takes 20s on 1.05X
(so a calculated 1.5X). 2X might be pretty close to 2x, but it was
hard to guage that one.

Another bug I noticed is that if time stretch is on and you skip
around, when it resumes, it plays at 1x, but the setting in the time
stretch remains at whatever value was previously selected (so for
example, run it at 1.2x, hit a skip, then it starts playing at 1x, but
the checkbox will still be next to 1.2x)

I love that feature and the fastforward feature, however, much nicer
than the skip! (especially how the extreme fast forward skips back a
little automatically when you stop it, assuming that the human reflex
is slower than needed to stop fast forwarding when needed)

 - Jeff

On Mon, 28 Feb 2005 17:29:40 -0400, stephen <[EMAIL PROTECTED]> wrote:
> Thom Paine wrote:
> 
> > On Mon, 28 Feb 2005 11:47:37 -0500, Nicholas McCoy <[EMAIL PROTECTED]> 
> > wrote:
> >
> >>I've got the same problem, except that I never got it to work before.
> >>I have a pvr-350 and I'm using knoppmyth.  When I installed 0.17 from
> >>cvs and it didn't work I assumed it was a hardware limitation.  You
> >>said you got it working though.  Are you using the video out from the
> >>350?  Has anyone else gotten this to work with the video out from the
> >>350?
> >>
> >
> >
> > I have this working with a 350, but I also have the chipmunks. I
> > thought that was the way it worked. I tried it on 1.2x.
> >
> 
> I've also got the chipmunk thing on my 350.  However, when using
> timestrech on my backend, the audio doesn't change to a higher pitch
> (hooked up to a montior via video card, no need for a tv-out or
> re-routing of the sound).  Both systems are running Gentoo
> (2.6.10-gentoo-dev-sources-r7).
> 
> I've noticed another odd thing -- if I choose a speed of 1.1, then go
> back to the menu to choose another, it shows 1.2 as being selected.  The
> speed always seems to be one notch more than what was previously
> selected.  (I think this was mentioned a few days ago, but I'm not sure ...)
> 
> Stephen
> 
> 
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Re: [mythtv-users] timestretch results in chipmunk sound

2005-02-28 Thread stephen
Thom Paine wrote:
On Mon, 28 Feb 2005 11:47:37 -0500, Nicholas McCoy <[EMAIL PROTECTED]> wrote:
I've got the same problem, except that I never got it to work before.
I have a pvr-350 and I'm using knoppmyth.  When I installed 0.17 from
cvs and it didn't work I assumed it was a hardware limitation.  You
said you got it working though.  Are you using the video out from the
350?  Has anyone else gotten this to work with the video out from the
350?

I have this working with a 350, but I also have the chipmunks. I
thought that was the way it worked. I tried it on 1.2x.
I've also got the chipmunk thing on my 350.  However, when using 
timestrech on my backend, the audio doesn't change to a higher pitch 
(hooked up to a montior via video card, no need for a tv-out or 
re-routing of the sound).  Both systems are running Gentoo 
(2.6.10-gentoo-dev-sources-r7).

I've noticed another odd thing -- if I choose a speed of 1.1, then go 
back to the menu to choose another, it shows 1.2 as being selected.  The 
speed always seems to be one notch more than what was previously 
selected.  (I think this was mentioned a few days ago, but I'm not sure ...)

Stephen
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Re: [mythtv-users] timestretch results in chipmunk sound

2005-02-28 Thread Gabe Rubin
One more follow up.  I notice that there is no libsoundtouch file on
my system.  Is this built into myth or do I need to get it to make
timestretch working?  I just find it odd that it did work at one point
but doesn't now.

Also, when I set the time stretch for 1.5x, I get the chipmunk effect
(as earlier reported), but if I skip ahead, the voice goes back to
normal.  Unfortunately, so does the video speed (I believe).
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Re: [mythtv-users] timestretch results in chipmunk sound

2005-02-28 Thread Thom Paine
On Mon, 28 Feb 2005 11:47:37 -0500, Nicholas McCoy <[EMAIL PROTECTED]> wrote:
> I've got the same problem, except that I never got it to work before.
> I have a pvr-350 and I'm using knoppmyth.  When I installed 0.17 from
> cvs and it didn't work I assumed it was a hardware limitation.  You
> said you got it working though.  Are you using the video out from the
> 350?  Has anyone else gotten this to work with the video out from the
> 350?
> 

I have this working with a 350, but I also have the chipmunks. I
thought that was the way it worked. I tried it on 1.2x.

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Re: [mythtv-users] timestretch results in chipmunk sound

2005-02-28 Thread Gabe Rubin
On Mon, 28 Feb 2005 11:47:37 -0500, Nicholas McCoy <[EMAIL PROTECTED]> wrote:
> I've got the same problem, except that I never got it to work before.
> I have a pvr-350 and I'm using knoppmyth.  When I installed 0.17 from
> cvs and it didn't work I assumed it was a hardware limitation.  You
> said you got it working though.  Are you using the video out from the
> 350?  Has anyone else gotten this to work with the video out from the
> 350?
> 

Yes it was working before, I wanted to mention that because a look
through the archives shows that some (like you) have never got it to
work with the PVR-350.

I am using the 350 for video and sound.  The sound is piped into my
sound card which outputs to my tv/stereo.  It had worked before the
upgrade.

It is possible that I somehow screwed up ALSA in the upgrade,
although, my sound playback is fine.  This is not a major issue for me
as I hardly use the timestretch, but I would like to use it for
certain shows.
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Re: [mythtv-users] timestretch results in chipmunk sound

2005-02-28 Thread Nicholas McCoy
I've got the same problem, except that I never got it to work before. 
I have a pvr-350 and I'm using knoppmyth.  When I installed 0.17 from
cvs and it didn't work I assumed it was a hardware limitation.  You
said you got it working though.  Are you using the video out from the
350?  Has anyone else gotten this to work with the video out from the
350?


On Mon, 28 Feb 2005 11:01:10 -0500, Gabe Rubin <[EMAIL PROTECTED]> wrote:
> I updated my FC1 this weekend, and had to reinstall the myth package
> due to some apt-wierdness.  After doing this, I am no longer able to
> use the time stretch feature without the chipmunk effect.  Is there
> another setting I need to change that I forgot to do?  I tried to
> apt-get install libsoundtouch but that package was not found.
> 
> This had worked prior to the upgrade, so I know it is not a hardware
> limitation, but if it matters I am using a pvr-350.
> 
> Thanks.
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