26-01-2018, 15:39
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#31
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Dr Pepper Addict
Cable Forum Team
Join Date: Oct 2003
Location: Nottingham
Age: 61
Services: Flextel SIP : Sky Mobile : Sky Q TV : VM BB (1000 Mbps) : Aquiss FTTP (330 Mbps)
Posts: 27,616
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Re: Mpeg4
Quote:
Originally Posted by Raider999
Thanks for the reply - however I am now confused as other posts have suggested that Mpeg4 recordings will use considerably less space. This is what makes me think quality may be compromised.
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Thats the progress of video compression.
MPEG2 is the dinosaur of its world, MP4 (x264) gives the same quality for less space.
Even thats out of date now, HEVC (x265) gives the same quality for even less space (up to 50% less in many cases).
The problem with HEVC is that many devices are not capable of decoding it properly yet.
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Baby, I was born this way.
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26-01-2018, 16:48
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#32
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Inactive
Join Date: Mar 2004
Services: BB:M, TV:XL, Phone:M, Loyalty
Posts: 2,516
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Re: Mpeg4
Was looking for this, having noticed a massive speed blast at 3rd step of FF (Tivo, not V6)
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26-01-2018, 19:03
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#33
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Perfect Soldier
Join Date: Mar 2009
Location: Worthing West Sussex
Age: 66
Services: VM 500M SH3 thingy
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XL TV V6 Sony Bravia smart TV and M phone
Posts: 10,966
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Re: Mpeg4
Quote:
Originally Posted by Paul M
The problem with HEVC is that many devices are not capable of decoding it properly yet.
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It needs the hardware to support it so you can't just download a firmware upgrade for most devices. Unfortunately our smart TV has no upgrade so we're stuck with x264 for playing downloaded content.
The file size reduction is quite impressive.
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History is much like an endless waltz: The three beats of war, peace and revolution continue on forever.
However history will change with my coronation - Mariemaia Khushrenada
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26-01-2018, 19:17
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#34
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cf.mega poster
Join Date: Mar 2010
Posts: 12,313
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Re: Mpeg4
Quote:
Originally Posted by heero_yuy
It needs the hardware to support it so you can't just download a firmware upgrade for most devices. Unfortunately our smart TV has no upgrade so we're stuck with x264 for playing downloaded content.
The file size reduction is quite impressive.
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Compression is getting better and better all the time
https://www.broadbandtvnews.com/2017...perseus-codec/
http://www.bbc.co.uk/news/av/technol...worth-watching
Last edited by muppetman11; 26-01-2018 at 19:21.
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27-01-2018, 12:23
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#35
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cf.mega poster
Join Date: Nov 2006
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Posts: 1,848
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Re: Mpeg4
Looks like there are a few issues cropping up on the Community forum.
Some VHD & V+HD customers reporting their HD channels at reverting to 4:3 aspect & they cant change it.
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27-01-2018, 12:34
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#36
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Perfect Soldier
Join Date: Mar 2009
Location: Worthing West Sussex
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XL TV V6 Sony Bravia smart TV and M phone
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Re: Mpeg4
Quote:
Originally Posted by nodrogd
Looks like there are a few issues cropping up on the Community forum.
Some VHD & V+HD customers reporting their HD channels at reverting to 4:3 aspect & they cant change it.
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Maybe it's a ploy to get them to change over to a V6?
__________________
History is much like an endless waltz: The three beats of war, peace and revolution continue on forever.
However history will change with my coronation - Mariemaia Khushrenada
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27-01-2018, 13:00
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#37
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cf.geek
Join Date: Oct 2006
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Re: Mpeg4
Quote:
Originally Posted by muppetman11
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The only issue with those codecs, i assume, is the broadcaster would have to buy a license to use it.
No such problems with an open source codec.
Aren't broadcasters moving away from the Dolby sound codec for TruSurround for options that don't require a license?
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27-01-2018, 13:22
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#38
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cf.mega poster
Join Date: Mar 2010
Posts: 12,313
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Re: Mpeg4
Sky bought a minority stake in V-Nova and uses it in Italy wonder whether that's why the dishless Sky Q option will firstly roll out in Italy.
6-10 Mbps for UHD is impressive.
Last edited by muppetman11; 27-01-2018 at 13:55.
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27-01-2018, 13:48
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#39
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Inactive
Join Date: Sep 2016
Posts: 210
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Re: Mpeg4
V6 rollout will most likely be partly in order to shift everything to MPEG4 (and maybe HEVC) so that there's capacity for more channels per MUX, freeing up MUXes for higher bandwidth broadband offerings.
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01-02-2018, 10:50
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#40
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cf.member
Join Date: Aug 2016
Posts: 88
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Re: Mpeg4
Probably a very basic question (so apologies in advance) but this format change only applies to recorded files, not "live" broadcasts. In other words, nothing has changed on live tv...
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01-02-2018, 10:58
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#41
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Perfect Soldier
Join Date: Mar 2009
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Re: Mpeg4
Quote:
Quote from bolgerp:
Probably a very basic question (so apologies in advance) but this format change only applies to recorded files, not "live" broadcasts. In other words, nothing has changed on live tv...
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It's the encoding of the actual streams from the headend. That's why they're keen to swap out all the boxes that will not support it.
That more efficient encoding will allow for better bit rates on some channels if they choose and more overall capacity elsewhere.
__________________
History is much like an endless waltz: The three beats of war, peace and revolution continue on forever.
However history will change with my coronation - Mariemaia Khushrenada
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01-02-2018, 11:17
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#42
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cf.mega poster
Join Date: Apr 2004
Location: Northampton
Services: Virgin Media TV&BB 350Mb,
V6 STB
Posts: 7,861
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Re: Mpeg4
Hope the fix this fast forward bug, and it is a bug. There is no good reason why it couldn't be 2x speed as before with MPEG2.
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01-02-2018, 11:27
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#43
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cf.mega poster
Join Date: Nov 2006
Location: West Herts
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Posts: 1,848
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Re: Mpeg4
Quote:
Originally Posted by bolgerp
Probably a very basic question (so apologies in advance) but this format change only applies to recorded files, not "live" broadcasts. In other words, nothing has changed on live tv...
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The transmission is encoded in MPEG4. The box records the transmission as recieved (bitrate, encoding etc).
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01-02-2018, 11:46
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#44
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cf.member
Join Date: Aug 2016
Posts: 88
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Re: Mpeg4
Quote:
Originally Posted by nodrogd
The transmission is encoded in MPEG4. The box records the transmission as recieved (bitrate, encoding etc).
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Ah ha... thanks guys. I wonder if this is why I have noticed a slight change in picture quality on Standard Definition channels recently. Do we know when these changes took effect?
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01-02-2018, 12:35
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#45
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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: Mpeg4
SD channels haven't changed - it's only on the HD channels
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