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mattmartini / itivo

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Thin bar of black and white pixels #19

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
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.

Original issue reported on code.google.com by smacdiarmid on 7 Nov 2008 at 6:09

GoogleCodeExporter commented 9 years ago 
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...

Original comment by yoav.yer...@gmail.com on 7 Nov 2008 at 6:29

GoogleCodeExporter commented 9 years ago 
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.

Original comment by smacdiarmid on 12 Dec 2008 at 7:55

GoogleCodeExporter commented 9 years ago 
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...

Original comment by yoav.yer...@gmail.com on 12 Dec 2008 at 8:32