Go Back   Tech Support Forum > Alternative Computing > Mac Support

User Tag List

Video Flickering

This is a discussion on Video Flickering within the Mac Support forums, part of the Tech Support Forum category. Good afternoon, I've recently noticed - in the past few weeks - an issue when viewing videos. They flicker/flash at


Closed Thread
 
Thread Tools Search this Thread
Old 09-21-2016, 08:15 AM   #1
mfmcgreal
 
Join Date: Jul 2010
Location: Manchester, UK
Posts: 596
OS: OS X El Capitan

My System


Good afternoon,

I've recently noticed - in the past few weeks - an issue when viewing videos. They flicker/flash at certain points really fast, as if there's a glitch or bug with either the video, or my graphics card. This only occurs now and then, and only once or twice during a video, however it's catching my attention more and more ..

The issue occurs consistently with the following video:

During certain points, a pink flash/flicker will occur .. Nothing that effects the video playing, but as if there is a software/hardware glitch somewhere. I've playedback the video in both Chrome and Safari, and Quicktime via my desktop, and same issue occurs. Please watch for yourself - it may just be an issue with the video file itself.

That said, the problem has been occurring with other videos, particularly in Vimeo, which I browse rather frequently.

Thanks,

Martin
mfmcgreal is offline  
Sponsored Links
Advertisement
 
Old 09-22-2016, 09:25 AM   #2
mfmcgreal
 
Join Date: Jul 2010
Location: Manchester, UK
Posts: 596
OS: OS X El Capitan

My System


BUMP!
mfmcgreal is offline  
Old 09-22-2016, 11:07 AM   #3
Moderator - Alternative Computing Team
 
MartyF81's Avatar
 
Join Date: Jan 2013
Location: Chicago
Posts: 900
OS: Mac OS, Windows, iOS

My System


What kind of machine do you have? Processor, etc...

What resolution is that video playing att?

Usually at video bug like that is a product of a CPU or GPU having a problem processing/transcoding the video.

It could be a CPU or GPU failing... depending on how old the machine is. Especially since it happening in browsers, AND in quick time (which eliminates it being a streaming problem)

Have you tried the Apple Hardware test?
__________________
MartyF81 is offline  
Sponsored Links
Advertisement
 
Old 09-22-2016, 11:30 AM   #4
mfmcgreal
 
Join Date: Jul 2010
Location: Manchester, UK
Posts: 596
OS: OS X El Capitan

My System


Quote:
Originally Posted by MartyF81 View Post
What kind of machine do you have? Processor, etc...

What resolution is that video playing att?

Usually at video bug like that is a product of a CPU or GPU having a problem processing/transcoding the video.

It could be a CPU or GPU failing... depending on how old the machine is. Especially since it happening in browsers, AND in quick time (which eliminates it being a streaming problem)

Have you tried the Apple Hardware test?
1) iMac (27-inch, Late 2013), 3.4 GHz Intel Core i5, 32 GB 1600 MHz DDR3, NVIDIA GeForce GTX 775M 2048 MB

2) 1920x1080p - though it's occurring in lower resolutions too - It appears to occur more when I full-screen videos.

To be fair, it's only the video I linked which is glitching in Quicktime too. Other videos appear to working fine .. Except iTunes, which is failing to playback 1080p movies .. (though I'm convinced this is a streaming issue w/ my internet)

As far Apple Hardware test, I haven't no .. Is this in any way dangerous? I have to deliver two pieces of content to clients in the next three or four days, so understandably I'm reluctant to put my machine through its paces with tests etc. until I've delivered the content ..

Cheers
mfmcgreal is offline  
Old 09-22-2016, 11:46 AM   #5
mfmcgreal
 
Join Date: Jul 2010
Location: Manchester, UK
Posts: 596
OS: OS X El Capitan

My System


UPDATE: Just ran Apple Hardware Tests .. No errors found ..
mfmcgreal is offline  
Old 09-22-2016, 11:50 AM   #6
Moderator - Alternative Computing Team
 
MartyF81's Avatar
 
Join Date: Jan 2013
Location: Chicago
Posts: 900
OS: Mac OS, Windows, iOS

My System


Well, if it is only this video.... then its probably something in the encoding of that video file that is choking the processor when it is transcoding it. Even more likely since it is on a video made with Magic Lantern (which is a hack and not officially supported).

AHT isn't really dangerous no.. and it doesn't like stress test the machine. but honestly in any situation.. if you have critical work it is always best to do that first. You never know if your issue is that some piece of hardware is failing... and even going on Facebook could be the straw that breaks the Camels back.

I would do this:

1. Finish your project.
2. Back up everything with Time Machine to an external drive.
3. Back up important files manually to an External drive, just to be safe.
4. Run AHT.

If problems found in AHT... probably need to take to Apple.

If no problems found by AHT... I would probably wipe the machine and do a clean OS install. Then try the video. If the issue is there on basically what would be a "clean" computer... then you likely have a hardware problem that AHT isn't finding.

If after a clean install... the problem disappears.. then you had some software that was causing the problem.

Since you made a Time Machine backup in step 2... you can always restore from the TM back up to restore your Machine back to how it was before you started all this..
__________________
MartyF81 is offline  
Old 09-22-2016, 11:57 AM   #7
mfmcgreal
 
Join Date: Jul 2010
Location: Manchester, UK
Posts: 596
OS: OS X El Capitan

My System


Quote:
Originally Posted by MartyF81 View Post
Well, if it is only this video.... then its probably something in the encoding of that video file that is choking the processor when it is transcoding it. Even more likely since it is on a video made with Magic Lantern (which is a hack and not officially supported).
Is there any glitching/flashing occurring for yourself when playing the video I linked?

Magic Lantern is surely irrelevant since once the video has reached Vimeo, it's by that point just a 1080p H264 file for example? I've watched dozens and dozens of ML videos in the past week too, and nothing like this has occurred.

It's only that video which the glitching occurs consistently without fail .. Other videos are fine .. The glitch or flash, which as I say, is a millisecond long, is only occurring now and then in videos, usually about 2secs into a video, especially when in full-screen mode. The bug is very subtle, to the point where once its happened, I'm doubting whether its just my eyes, or it did indeed occur .. Its definitely there though, I've noticed it too many times in the past few weeks for it be human error ..
mfmcgreal is offline  
Old 09-22-2016, 12:10 PM   #8
Moderator - Alternative Computing Team
 
MartyF81's Avatar
 
Join Date: Jan 2013
Location: Chicago
Posts: 900
OS: Mac OS, Windows, iOS

My System


Ya actually I did just play the video... and see a bunch of glitching all over the place.


H264 is just a codec. But Garbage in = Garbage out. If the original file is bugged during creating... its not going to be fixed by simply playing it somewhere else.

For example... if I misspell a word in a document and save it as .doc its going to still be misspelled in Word, Google Docs, Text Edit, etc... What I open the file in... doesn't fix the original problem.
__________________
MartyF81 is offline  
Old 09-22-2016, 01:37 PM   #9
mfmcgreal
 
Join Date: Jul 2010
Location: Manchester, UK
Posts: 596
OS: OS X El Capitan

My System


Quote:
Originally Posted by MartyF81 View Post
Ya actually I did just play the video... and see a bunch of glitching all over the place.


H264 is just a codec. But Garbage in = Garbage out. If the original file is bugged during creating... its not going to be fixed by simply playing it somewhere else.

For example... if I misspell a word in a document and save it as .doc its going to still be misspelled in Word, Google Docs, Text Edit, etc... What I open the file in... doesn't fix the original problem.
I misunderstood your original point ..

I thought you were speaking as if Magic Lantern was still actively creating the issue whilst streaming, which of course isn't possible. As you say, if the problems in the original file, it will be there forever, regardless of codec.
mfmcgreal is offline  
Closed Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
New computer lagging
Hello everyone, I bought a computer 2 weeks ago, was AMAZING! running star wars battlefront at 60fps full graphics, the division 60fps at full graphics. Life couldn't be better. And then... My wife accidentally unplugged the power cable... Now, my PC lags as if it an Atari, My fps goes...
wolf5659 Other Hardware Support 5 03-21-2016 11:48 AM
Sound Driver needed!
My PC Intel i815/E/EP, my onboard sound device stopped working! Can I fix it by installing a new driver update, or what can I do please help! My dxdiag log(if needed): ------------------ System Information ------------------ Time of this report: 12/11/2012, 23:33:50 Machine name:...
VergilDD Sound Cards 1 12-11-2012 05:55 PM
BSOD with new vegas
Hi, I usually played this game fine, it BSOD a couple of time during gameplay but they were always isoleted accidents. Now I've re installed it and Every time I go out of the first building it BSOD after the loading screen. I've done a memory check and it came out without errors. Can someone...
Eingya PC Gaming Support 2 11-21-2012 03:31 PM
video card or driver doesn't support UBYTE4N vertex data
------------------ System Information ------------------ Time of this report: 2/26/2012, 05:38:07 Machine name: JFZ-PC Operating System: Windows 7 Ultimate 32-bit (6.1, Build 7600) (7600.win7_gdr.111025-1503) Language: English (Regional Setting: English) System...
jfz09 Video Card Support 5 02-26-2012 08:41 AM
Missing video drivers
Right my friend was playing Sims 3 this morning and it said there was an update, so he updated and then everything just went weird, seems like the graphics card driver was uninstalled and he could play sims 3 before but after the update it said he couldn't. I tried to find the graphics card name...
Nekoh Driver Support 10 03-26-2011 04:44 PM

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Post a Question


» Site Navigation
 > FAQ
  > 10.0.0.2
Powered by vBadvanced CMPS v3.2.3


All times are GMT -7. The time now is 02:20 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright 2001 - 2018, Tech Support Forum

Windows 10 - Windows 7 - Windows XP - Windows Vista - Trojan Removal - Spyware Removal - Virus Removal - Networking - Security - Top Web Hosts