Macroblocking? - Page 2 - Canadian TV, Computing and Home Theatre Forums
Reply
 
LinkBack Thread Tools Search this Thread Display Modes

post #16 of 26 (permalink) Old 2012-01-30, 01:44 PM
57
Moderator
 
Join Date: May 2002
Location: Toronto, Rogers, 9865 & 8300-eHDD, Sharp LC75N8000U, Denon AVR4310Ci; Sony KDL40W3000, 9865
Posts: 56,075
Billy34: Your post was moved to this existing thread. Please read earlier posts, especially post 2 thoroughly.

57's Home Theatre (Latest equipment & photos)
57 is offline  
Sponsored Links
Advertisement
 
post #17 of 26 (permalink) Old 2012-02-11, 10:11 AM
 
Join Date: Apr 2011
Posts: 53
i have the same problem. as soon as there's any kind of fast action on an hd channel, the compression really shows. once my promotional period is over, if this doesn't improve, i'm done. (the software on the pvr really blows too, so that doesn't help)
Cantor is offline  
post #18 of 26 (permalink) Old 2012-02-11, 08:08 PM
 
Join Date: Jul 2007
Location: BC Interior, Shaw Direct
Posts: 131
I think this is because of the compression Shaw uses. I use a R5000 to record off of a 505 receiver (the R5000 records the actual MPEG2 data from the receiver). I ran a recording I made of the Mentalist this past this Thursday (channel 286, CBS Detroit) through VideoReDo. It reported the actual bitrate as 9.66mbps, which is quite a bit less than what OTA ATSC is.
peternm22 is offline  
 
post #19 of 26 (permalink) Old 2012-02-12, 07:53 AM
 
Join Date: Dec 2003
Posts: 1,080
Quote:
9.66mbps
That's part of the reason. Years ago, DirecTV engineers proved that signal degradation was viewable at bitrates less than 12mbs for a MPEG2 HD signal. That means loading more than 3 HD signals/transponder makes SD no better than BellII.

Add to this the use of ancient MPEG2 encoders + the lack of tech skills or caring by SBS engineers leads to the lower quality PQ.

These flaws are further amplified on sets with less than optimal settings.
987654321 is offline  
post #20 of 26 (permalink) Old 2012-02-27, 12:58 PM
Rookie
 
Join Date: Aug 2011
Posts: 14
Pixelation/Macroblocking worse on certain TVs?

I have the HD530 receiver and I notice macro blocking during fast motion on my 720P 50" Samsung plasma that I paid $900 for back in 2009.

I read from one person on a best buy review that for an entry level plasma that he bought he noticed a fair bit of macro blocking. He then returned the TV and spent an additional $1000 on a Panasonic plasma and noticed a huge improvement in the picture quality on his Shaw direct service. He claimed the Panasonic image processor dealt better with high compression of the HD content via his Shaw Direct service.

Obviously everyone's experience is going to be somewhat different depending on the settings your TV has setup. I for one can 'reduce' the amount of macro blocking that I see by literally during off all the picture enhancements like sharpness and dynamic contrast. Of course the result is I get a fairly soft and less vibrant picture.

I'm wondering if buying a newer TV would reduce the amount of macro blocking that I see on Shaw Direct with my HD530 receiver OR if I bought a 600 series HD receiver if that would improve the picture quality.

I even gone so far as to think I could purchase a standalone image processor for $1500 but I'm sure that would just result in money being wasted for the amount of improvement I would see. Where as a newer tv at least I could get the benefit of a larger set.

For those who own multiple TVs do you notice that much of difference in terms of macro blocking or pixelation?
izanaki is offline  
post #21 of 26 (permalink) Old 2012-02-27, 04:45 PM
57
Moderator
 
Join Date: May 2002
Location: Toronto, Rogers, 9865 & 8300-eHDD, Sharp LC75N8000U, Denon AVR4310Ci; Sony KDL40W3000, 9865
Posts: 56,075
Your post was moved to this existing thread on the topic. Please read post 2 and the links there carefully. Even the same TV with different settings can exhibit different macroblocking characteristics, as you have already noticed. There is not really a huge difference between TVs once they are properly optimized though.

57's Home Theatre (Latest equipment & photos)
57 is offline  
post #22 of 26 (permalink) Old 2013-12-18, 09:53 PM
 
Join Date: Sep 2013
Location: Ontario
Posts: 608
Would the 'Fire Log' channel on 955 be a good test for optimizing the picture?
robman50a is offline  
post #23 of 26 (permalink) Old 2014-12-07, 07:16 PM
 
Join Date: Nov 2012
Posts: 194
Picture Compression

Has anyone else noticed an increase in compression lately? Sony TV was horribly compressed and blocky yesterday and I've noticed that Q13 Fox and a couple of others are also noisier than normal. Any thoughts?
CrispyPotato is offline  
post #24 of 26 (permalink) Old 2014-12-07, 08:00 PM
Veteran
 
Join Date: Jan 2009
Location: 127.0.0.1
Posts: 3,370
Do you mean compressed, or do you mean macroblocking artifacts caused by signal noise?

Is the quality fairly consistent (although poor), or do you seem to get some "spikes" of poor quality video?
audacity is offline  
post #25 of 26 (permalink) Old 2014-12-07, 08:13 PM
 
Join Date: Nov 2012
Posts: 194
No, I mean compression. For example, Sony yesterday was consistently poor and blocky. There are no spikes. It just seems that some channels are showing more macroblocking than usual, leading to suspicion that the signal is being further compressed. I just checked CNN which is another which springs to mind, and I see the same issue. Lots of small blocks.
CrispyPotato is offline  
post #26 of 26 (permalink) Old 2014-12-07, 09:17 PM
 
Join Date: Jan 2013
Posts: 114
I noticed TSN's NHL game on Dec 6 was very compressed,lots of macro blocking at times.
Time for a fourth Bird already
Romany is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Canadian TV, Computing and Home Theatre Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome