Mailing List Archive: MythTV: Users

Must recording re-start when swtching channel?

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debian at nc

Sep 12, 2003, 12:12 PM

Post #1 of 11 (2057 views)
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Must recording re-start when swtching channel?

I got home today for my lunch hour and I noticed that I've left livetv
on all morning. I switch channels and it took about 20 seconds to
respond. I was almost reaching for the power button...

I assume that it was because the livetv buffer was large and it took a
while to erase it (is that right?) After that channel changing took its
usual 3-5 secs (which is nothing to write home about either btw)

---> My questions:

why must the buffer be cleared?

Can we not just keep recording and when we rewind livetv we just see the
channel change happen backwards?

just wondering...

-jose-

wd at pobox

Sep 12, 2003, 12:20 PM

Post #2 of 11 (2000 views)
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Re: Must recording re-start when swtching channel? [In reply to]

At 03:12 PM 9/12/2003 -0400, you wrote:
>I got home today for my lunch hour and I noticed that I've left livetv
>on all morning. I switch channels and it took about 20 seconds to
>respond. I was almost reaching for the power button...
>
>I assume that it was because the livetv buffer was large and it took a
>while to erase it (is that right?) After that channel changing took its
>usual 3-5 secs (which is nothing to write home about either btw)

Try using a reiserfs partition. As mentioned in a recent post, it cuts
down the file delete time tremendously.

-WD

ijr at po

Sep 12, 2003, 12:30 PM

Post #3 of 11 (2011 views)
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Re: Must recording re-start when swtching channel? [In reply to]

On Friday 12 September 2003 03:20 pm, Will Dormann wrote:
> At 03:12 PM 9/12/2003 -0400, you wrote:
> >I got home today for my lunch hour and I noticed that I've left livetv
> >on all morning. I switch channels and it took about 20 seconds to
> >respond. I was almost reaching for the power button...
> >
> >I assume that it was because the livetv buffer was large and it took a
> >while to erase it (is that right?) After that channel changing took its
> >usual 3-5 secs (which is nothing to write home about either btw)
>
> Try using a reiserfs partition. As mentioned in a recent post, it cuts
> down the file delete time tremendously.

Alternatively, you _could_ try current CVS.

Isaac
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ijr at po

Sep 12, 2003, 12:50 PM

Post #4 of 11 (2007 views)
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Re: Must recording re-start when swtching channel? [In reply to]

On Friday 12 September 2003 03:57 pm, jose rubio wrote:
> I'll try the latest CVS tonight... But that still leaves un-answered
> the question of whether it is required to delete the livetv buffer after
> channel changes.

It took me less than half a minute to change it to not truncate the file when
it resets the buffer on channel change. Much less time than you all are
wasting blabbering on about it.

Isaac
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http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

debian at nc

Sep 12, 2003, 12:57 PM

Post #5 of 11 (1991 views)
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Re: Must recording re-start when swtching channel? [In reply to]

On Fri, 2003-09-12 at 15:30, Isaac Richards wrote:
> On Friday 12 September 2003 03:20 pm, Will Dormann wrote:
> > At 03:12 PM 9/12/2003 -0400, you wrote:
> > >I got home today for my lunch hour and I noticed that I've left livetv
> > >on all morning. I switch channels and it took about 20 seconds to
> > >respond. I was almost reaching for the power button...
> > >
> > >I assume that it was because the livetv buffer was large and it took a
> > >while to erase it (is that right?) After that channel changing took its
> > >usual 3-5 secs (which is nothing to write home about either btw)
> >
> > Try using a reiserfs partition. As mentioned in a recent post, it cuts
> > down the file delete time tremendously.
>
> Alternatively, you _could_ try current CVS.
>
> Isaac
I'll try the latest CVS tonight... But that still leaves un-answered
the question of whether it is required to delete the livetv buffer after
channel changes.

-jose-

reza at reza

Sep 12, 2003, 1:07 PM

Post #6 of 11 (2015 views)
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Re: Must recording re-start when swtching channel? [In reply to]

No offense , but I spent a good two hour last night going through the
code trying to figure out what happens when you change a channel. It
really is easier to change/fix code when you know what is where.

Out of curiosity, are there any ioctl()s issued to the sound card when a
channel is changed? Under ALSA, my audio in gets all broken after a
channel change -- works ok with OSS though. I still need to dig through
the code some more and am sure I'll eventually figure it out, but I
suppose it doesn't hurt to ask.

-reza

On Fri, Sep 12, 2003 at 03:50:38PM -0400, Isaac Richards sent me this...
> On Friday 12 September 2003 03:57 pm, jose rubio wrote:
> > I'll try the latest CVS tonight... But that still leaves un-answered
> > the question of whether it is required to delete the livetv buffer after
> > channel changes.
>
> It took me less than half a minute to change it to not truncate the file when
> it resets the buffer on channel change. Much less time than you all are
> wasting blabbering on about it.
>
> Isaac
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

curtis at stanfordcomputing

Sep 12, 2003, 1:20 PM

Post #7 of 11 (2004 views)
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Re: Must recording re-start when swtching channel? [In reply to]

Tried CVS just now and I get no improvement in channel change time. Was that
the intent?

On September 12, 2003 02:07 pm, Reza Naima wrote:
> No offense , but I spent a good two hour last night going through the
> code trying to figure out what happens when you change a channel. It
> really is easier to change/fix code when you know what is where.
>
> Out of curiosity, are there any ioctl()s issued to the sound card when a
> channel is changed? Under ALSA, my audio in gets all broken after a
> channel change -- works ok with OSS though. I still need to dig through
> the code some more and am sure I'll eventually figure it out, but I
> suppose it doesn't hurt to ask.
>
> -reza
>
> On Fri, Sep 12, 2003 at 03:50:38PM -0400, Isaac Richards sent me this...
>
> > On Friday 12 September 2003 03:57 pm, jose rubio wrote:
> > > I'll try the latest CVS tonight... But that still leaves un-answered
> > > the question of whether it is required to delete the livetv buffer
> > > after channel changes.
> >
> > It took me less than half a minute to change it to not truncate the file
> > when it resets the buffer on channel change. Much less time than you all
> > are wasting blabbering on about it.
> >
> > Isaac
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users [at] mythtv
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

_______________________________________________
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debian at nc

Sep 12, 2003, 1:20 PM

Post #8 of 11 (2015 views)
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Re: Must recording re-start when swtching channel? [In reply to]

On Fri, 2003-09-12 at 15:50, Isaac Richards wrote:
> On Friday 12 September 2003 03:57 pm, jose rubio wrote:
> > I'll try the latest CVS tonight... But that still leaves un-answered
> > the question of whether it is required to delete the livetv buffer after
> > channel changes.
>
> It took me less than half a minute to change it to not truncate the file when
> it resets the buffer on channel change. Much less time than you all are
> wasting blabbering on about it.
>
> Isaac

That's 'cause you-da-man. It takes me about 5 minutes to remember what
I need to type to update from the CVS...

Thanks.

-jose-

webmaster at dddane

Sep 12, 2003, 1:22 PM

Post #9 of 11 (1997 views)
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Re: Must recording re-start when swtching channel? [In reply to]

> It took me less than half a minute to change it to not truncate the file
when
> it resets the buffer on channel change. Much less time than you all are

I kind of like the "feature" of it deleting the buffer if you will...did you
change it in CVS, and is it an option or just changed now? at what point
does the buffer clear itself if its not during a channel change?

BTW, channel changing seems to have been sped up dramatically recently... is
this true or is that my imagination?

-dane

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http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

ijr at po

Sep 12, 2003, 1:43 PM

Post #10 of 11 (2001 views)
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Re: Must recording re-start when swtching channel? [In reply to]

On Friday 12 September 2003 04:07 pm, Reza Naima wrote:
> No offense , but I spent a good two hour last night going through the
> code trying to figure out what happens when you change a channel. It
> really is easier to change/fix code when you know what is where.

Yeah, looking at the RingBuffer.cpp code for where it opens and closes the
files would take a long time =)

> Out of curiosity, are there any ioctl()s issued to the sound card when a
> channel is changed?

Nope, it doesn't do anything like that.

Isaac
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mythtv-users [at] mythtv
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

ijr at po

Sep 12, 2003, 1:45 PM

Post #11 of 11 (2017 views)
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Re: Must recording re-start when swtching channel? [In reply to]

On Friday 12 September 2003 04:22 pm, Dane Kantner wrote:
> > It took me less than half a minute to change it to not truncate the file
>
> when
>
> > it resets the buffer on channel change. Much less time than you all are
>
> I kind of like the "feature" of it deleting the buffer if you will...did
> you change it in CVS, and is it an option or just changed now? at what
> point does the buffer clear itself if its not during a channel change?

It still resets the buffer, it just doesn't truncate the file anymore.

Isaac
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mythtv-users mailing list
mythtv-users [at] mythtv
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

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