Channels switched to MPEG4
04-07-2019, 16:33
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#91
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cf.mega poster
Join Date: Jun 2003
Posts: 9,018
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Re: Channels switched to MPEG4
Quote:
Originally Posted by Raider999
Noticing a worse PQ lately, presumably as a result of Mpeg4 compression?
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On which channels?
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04-07-2019, 16:50
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#92
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Be a Volunteer.
Join Date: Jan 2007
Posts: 2,583
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Re: Channels switched to MPEG4
Quote:
Originally Posted by Raider999
Noticing a worse PQ lately, presumably as a result of Mpeg4 compression?
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I recall someone, I don't want to misquote someone or attribute it to the wrong person, saying MPEG4 compression algorithms can't reproduce 720x480 resolution spot-on so they do 704x480 (or similar) since there is no point in going slightly bigger, and it's closest resolution.
If this is true it could explain it. MPEG4 compression apparently works better on reproducing other common higher resolutions so maybe with HD becoming the norm many in the industry think the trade-off is worth it for the remaining SD channels as it simplifies their infrastructure and lowers costs by running as few codecs on networks as possible.
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04-07-2019, 17:47
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#93
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cf.mega poster
Join Date: Jun 2003
Posts: 9,018
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Re: Channels switched to MPEG4
Quote:
Originally Posted by cheekyangus
I recall someone, I don't want to misquote someone or attribute it to the wrong person, saying MPEG4 compression algorithms can't reproduce 720x480 resolution spot-on so they do 704x480 (or similar) since there is no point in going slightly bigger, and it's closest resolution.
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That was me, explaining why the picture is slightly cropped on some channels. I doubt you would notice a PQ difference between 720 and 704
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07-07-2019, 12:08
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#94
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cf.mega poster
Join Date: Dec 2016
Posts: 1,641
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Re: Channels switched to MPEG4
Quote:
Originally Posted by spiderplant
On which channels?
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As I only watch sport it will be on the Sky Sports channels - when I said PQ deterioration I mean the picture breaks up.
This has been noticeable on a number of the Cricket World Cup matches when watching live. (So mainly 504)
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07-07-2019, 12:24
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#95
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cf.mega poster
Join Date: Jun 2003
Posts: 9,018
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Re: Channels switched to MPEG4
Quote:
Originally Posted by Raider999
I mean the picture breaks up.
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Oh, that's probably a signal fault. You need a technician visit.
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08-07-2019, 13:03
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#96
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Virgin Media Employee
Join Date: Sep 2005
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Re: Channels switched to MPEG4
Sorry if this has been mentioned elsewhere in thread but is this move why the sides of pictures are cut off? Really annoying on sport where the home team name is now missing on Ozzie rules matches.
I know my TV doesn't like HD and switches to 4:3. It does this most channels now. SD is our choice as we don't have HD TV and recording take far less space.
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08-07-2019, 13:06
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#97
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Virgin Media Staff
Join Date: Nov 2006
Location: Manchester
Services: 360 x2, Maxit TV, Sky Sports and Sky Cinema. Gig1
Posts: 17,929
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Re: Channels switched to MPEG4
Quote:
Originally Posted by tweetiepooh
Sorry if this has been mentioned elsewhere in thread but is this move why the sides of pictures are cut off? Really annoying on sport where the home team name is now missing on Ozzie rules matches.
I know my TV doesn't like HD and switches to 4:3. It does this most channels now. SD is our choice as we don't have HD TV and recording take far less space.
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Literally a couple of posts above:
Quote:
Originally Posted by cheekyangus
I recall someone, I don't want to misquote someone or attribute it to the wrong person, saying MPEG4 compression algorithms can't reproduce 720x480 resolution spot-on so they do 704x480 (or similar) since there is no point in going slightly bigger, and it's closest resolution.
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Quote:
Originally Posted by spiderplant
That was me, explaining why the picture is slightly cropped on some channels. I doubt you would notice a PQ difference between 720 and 704
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09-07-2019, 16:52
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#98
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cf.mega poster
Join Date: Dec 2016
Posts: 1,641
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Re: Channels switched to MPEG4
Quote:
Originally Posted by spiderplant
Oh, that's probably a signal fault. You need a technician visit.
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You may be correct.
I have managed to narrow it down a bit - mostly when a roving (presumably hand-held) camera is being used instead of the main cameras
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09-07-2019, 17:08
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#99
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cf.mega poster
Join Date: Jun 2003
Posts: 9,018
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Re: Channels switched to MPEG4
Quote:
Originally Posted by Raider999
I have managed to narrow it down a bit - mostly when a roving (presumably hand-held) camera is being used instead of the main cameras
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well that would be a problem from source. Possibly there is too much camera movement to encode cleanly. Can you get me a screenshot of the problem?
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11-07-2019, 16:47
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#100
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cf.mega poster
Join Date: Dec 2016
Posts: 1,641
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Re: Channels switched to MPEG4
Quote:
Originally Posted by spiderplant
well that would be a problem from source. Possibly there is too much camera movement to encode cleanly. Can you get me a screenshot of the problem?
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I will try to next time I see the problem.
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14-07-2019, 15:25
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#102
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Be a Volunteer.
Join Date: Jan 2007
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Re: Channels switched to MPEG4
Quote:
Originally Posted by Media Boy
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Intriguing. I thought I looked on DBR on Friday... obviously I didn't or I need my eyesight checked.
Ta, MB. 
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17-07-2019, 17:30
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#103
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Got inside news - PM me
Join Date: Jul 2006
Location: Media Boy UK HQ
Posts: 15,105
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Re: Channels switched to MPEG4
We found some HD Channels did move to an new steam last night. They move from CO35 to CO67.
Animal Planet HD
More4 HD
ZooMoo HD
We has to re-Add them to our Favourites.
The rest was
Sky Thriller HD
Sky Action HD
Sky Sports Football HD
SONY MAX HD
Plus an Stream has close - Virgin are now running 42 streams in our area.
Last edited by Media Boy UK; 17-07-2019 at 17:37.
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17-07-2019, 20:46
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#104
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cf.mega poster
Join Date: Dec 2016
Posts: 1,641
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Re: Channels switched to MPEG4
Quote:
Originally Posted by Media Boy
We found some HD Channels did move to an new steam last night. They move from CO35 to CO67.
Animal Planet HD
More4 HD
ZooMoo HD
We has to re-Add them to our Favourites.
The rest was
Sky Thriller HD
Sky Action HD
Sky Sports Football HD
SONY MAX HD
Plus an Stream has close - Virgin are now running 42 streams in our area.
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Probably why I've just had to re-add SS Football HD to my favourites.
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17-07-2019, 21:00
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#105
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Got inside news - PM me
Join Date: Jul 2006
Location: Media Boy UK HQ
Posts: 15,105
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Re: Channels switched to MPEG4
Quote:
Originally Posted by Media Boy
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"Channel A" has started to broadcast we think it Sky Witness +1
All the other BBC Red Button Channels are now broadcasting a "We'll be back" sign.
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