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Poppa Mintin

Posted: Wed Nov 30, 2011 4:47 pm

Frequent contributor Joined: 09 May 2011 Posts: 106 Location: Near Lincoln UK

Hi, a short while ago you guys helped when I had a problem with my Red 'Jump' button, this (sort of) continues from then, I thought it may be of interest.

I have my MyStuff 'Jump' buttons configured in this manner: -

Red: Back 20 Seconds: -20
Green: Forward 2 Minutes: 120
Yellow: Forward 30 Seconds: 30
Blue: Forward 10 Seconds: 10

With these times I can jump through ad's pretty well...
Sometimes though I might jump forward (say) 30 sec's and find I've gone too far, so I'd jump back 20sec, and then if that's too far back I'd jump forward 10 sec's.... an aggregate of 10 Sec's back... Simple. However...

When I did the back 30, forward 10, I'd find myself back pretty much where I was before I did the backward jump. So... I made myself a little video of a time display incrementing every 100mS, in the form where [ 0:15:08.5 ] would show 15Min's 8½ Sec's. Now I can see what is happening...

I find in order to achieve my required timing (close enough) I need to set the jumps thus: -

Red: Back 20 Seconds: -24
Green: Forward 2 Minutes: 128
Yellow: Forward 30 Seconds: 30
Blue: Forward 10 Seconds: 9

I don't know if you claim any accuracy for MyStuff's jumps, I've not noticed anything to that effect, on the other hand of course, maybe there's something wrong with my Toppy.

Poppa.

PS. If anyone would like a copy of my little (Ten minute) video, I imagine that some means of making it available ought to be simple enough.

Pop.

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mavison

Posted: Wed Nov 30, 2011 8:08 pm

Frequent contributor Joined: 30 May 2007 Posts: 212 Location: Kent, UK

Jump times are really approximate. As I understand it, one reason is that the transmitted signal only contains a complete picture at intervals. After a complete picture only the *differences* are transmitted. So any jump has to find the nearest (? or previous, or next?) complete picture before it can start the display. The intervals between complete pictures vary with program and channel, as it affects the overall data rate.

Others may be along with much better technical descriptions.

_________________
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TAPs: TAP Commander 1.34; EPG2MEI v0.96; Extend v1.7; Font Manager 1.0d; MyStuff 6.4; TF5000 Display v1.53; SecCache (UK) v0.4; EIT Sub (Game) v0.6; MyInfo B5.5; ScreenCapture with OSD V3.0; (Power Restore V0.7.7);
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juwlz

Posted: Thu Dec 01, 2011 3:55 am

MyStuff Team Joined: 12 Aug 2005 Posts: 9647 Location: Wokingham, Berkshire (Hannington transmitter)

I'm fairly certain that it always jumps to the *next* GOP, which is why forward jumps turn out to be bigger than backward jumps of the "same size". Note that GOPs vary in size depending on channel, so jumps that work a particular way on one channel may not work the same way on another.

Julie

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Poppa Mintin

Posted: Sat Dec 03, 2011 12:51 pm

Frequent contributor Joined: 09 May 2011 Posts: 106 Location: Near Lincoln UK

juwlz wrote:

Thanks Julie, What's a GOP ?
Do you mean TV channel? e.g. (say) BBC1 and Channel 4 ?
Yes, I find that on some channels, 'Back 20' doesn't seem to go back as far as I expect, even after my 'time tweak'.

Poppa.

andyfras

Posted: Sat Dec 03, 2011 1:04 pm

Frequent contributor Joined: 25 Jul 2005 Posts: 2793 Location: Fleet, Hampshire (Hannington)

GOP = Group of pictures

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juwlz

Posted: Sat Dec 03, 2011 9:23 pm

MyStuff Team Joined: 12 Aug 2005 Posts: 9647 Location: Wokingham, Berkshire (Hannington transmitter)

Yes, I do mean TV channels. BBC channels typically have higher bit rates, so the GOP boundaries are closer together, resulting in more accurate jumps than on channels with lower bit rates where the GOP boundaries are further apart.

Julie

Poppa Mintin

Posted: Sun Dec 04, 2011 4:10 pm

Frequent contributor Joined: 09 May 2011 Posts: 106 Location: Near Lincoln UK

Thanks guys... Interesting.

Poppa.

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