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Issue 19: Thin bar of black and white pixels
2 people starred this issue and may be notified of changes. Back to list
Status:  WontFix
Owner:  yoav.yer...@gmail.com
Closed:  Nov 2008


 
Reported by smacdiarmid, Nov 6, 2008
What steps will reproduce the problem?
1. Play a .mpg file using VLC (or other players) after downloading a show
2.
3.

What is the expected output? What do you see instead?
Everything plays fine but there is a very thin bar (maybe a couple of pixels tall) across the top of 
the whole screen that just displays random black and white pixels.

What version of the product are you using? On what operating system?
iTivo 1.3 OS X 10.5.5

Please provide any additional information below.



Nov 6, 2008
Project Member #1 yoav.yer...@gmail.com
I'm pretty sure you're seeing the hidden 'closed captioning' information.  It is
transmitted in the first few scanlines of your TV show.  TV's do not show the outside
edge of an image, so you're not seeing it but it is there.

  It would be possible to forcibly remove the first few rows and rescale the image,
but that would lead to a lot more granularity as the image is scaled, and re-encoded
multiple times.

  Marking this as a 'wont fix' assuming that this is what it is...  Tell me if this
is not the case...
Status: WontFix
Owner: yoav.yerushalmi
Labels: -Type-Defect -Priority-Medium Type-Other Priority-Low
Dec 12, 2008
#2 smacdiarmid
Is there any way to fix this without affecting show quality.  I know with Handbrake you can tell it to crop the first 
4 lines and that takes care of the problem.  I haven't noticed any decrease in quality as a result.

Is there a similar method that could be be used with the mencoder h.264 options, to simply crop the top few 
lines and leave the video quality in tact.

If so that would be great.  It is a little distracting when watching the shows on your computer to have the 
randomly displaying white pixels in the top few lines.
Dec 12, 2008
Project Member #3 yoav.yer...@gmail.com
Yes it is possible to crop with mencoder or with handbrake.
  Both of those yield a loss in quality (although you may not notice it  :).

  Look up 'mencoder crop' in google for description.  Unfortunately you're gonna need
to know the size of the image before you can crop it (or you can scale and then crop,
but that will be even worse quality loss).

  Then put the options into your advanced options tab...

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