[mythtv-users] Custom Modeline

[David]

Cory Papenfuss wrote:

>     Don't take it so personally.  I looked at the webpage, and it 
> looks great.

Thanks - the wiki doesn't get a huge amount of encouragement (!) so it 
is in danger of fading away.

>   It will probably help out a lot of people.  I was attempting to 
> describe how modelines work so that people aren't so intimidated by 
> them.  I also took a look at videogen, and seeing something like:
>
> USAGE: videogen [-h] [-v|-q] [-fb|-nfb] [-nv|-nnv] [-f=<file|->] 
> [-m=<mode>]
>                 [-mdc=<n>] [-mhf=<n>] [-mvf=<n>] [-dvf=<n>] [-hv=<n>] 
> [-vv=<n>]
>                 [-hfp=<n>] [-hbp=<n>] [-hsp=<n>] [-vfp=<n>] [-vbp=<n>] 
> [-vsp=<n>]

Yeah - uck!

>
>     This is not directly intuitive to me.  I guess my main point is 
> that describing a video signal standard is inherently complicated.  
> Most times, an automated tool that generates generates a line for you 
> will do perfectly fine (think 'XF86Config').  Once in awhile, some 
> minor change might be necessary (think 'videogen' or 'xvidtune').  My 
> point is that if one requires all the strict control of all of the 
> options available with a tool like videogen, then you basically 
> already know everything necessary to compute the modeline yourself.  
> If I'm going to take the time to learn something, I would rather learn 
> the basics that are reusable later, rather than learn the finer 
> details of a one-time-use tool.

That's the spirit I in which I extended the HowTo

>
>     As another example, if one wanted to construct an underscanning 
> mode, how would one use the 'videogen' tool without already knowing 
> *exactly* what mode he wanted anyway?  How about shifting the picture 
> up/down/left/right? Hrm... maybe I aught to write my own utility or 
> add to videogen.... :)

What's underscanning? why would I want that?

(The javascript page I link to does the shifting calcs btw.)

feel free to add to the wiki as well as replying ;)
You can register so edit's bear your name (which is nice so people can 
know who they're talking to) or just do it anonymously.

David