[vlc-devel] Crystal HD for 1080i MPEG2 and closed captions on low-end system

Devin Heitmueller dheitmueller at kernellabs.com
Fri Jun 10 15:26:10 CEST 2011

On Thu, Jun 9, 2011 at 5:01 PM, Patrick Jackson <pejackson at gmail.com> wrote:
> Thank you for the prompt response.
> Doing some more testing with the software-only (i.e. no Crystal HD card) method, it seems that the closed-caption blending is really taxing the CPU. The way the letters are all blended to block the least amount of picture is very nice, but is there a setting that would make this easier on the CPU (like a black-barred background)?

I actually did a bunch of patches to the EIA-608 decoder so that it
now conforms to the spec in terms of caption placement (and fixing
other bugs too), as well as introducing a black background under the
text (which is what most people who actually use closed captioning
would expect).

The patches are for vlc-1.1.5, but I suspect they would probably
forward port without much difficulty:


It would be great to see these upstreamed, but I just haven't had a
chance to do it.


Devin J. Heitmueller - Kernel Labs

More information about the vlc-devel mailing list