On Thu, 28 Oct 2004, Dik Takken wrote:
> > 1: 50 full-resolution images per second.
> > 2: 25 full-resolution images per second.
>
> That would be number 2 in my case :)
Ok - good, then mpeg2enc will do all the necessary work for you.
> > In case 2, however, you've got to do the same thing people do when they
> > convert wet film material into PAL: Take all odd-numbered lines of image 1
> > (I'm deliberately avoiding "frame" here, and in point 1.) and put them into
> > the top field, then all even-numbered lines of, still, image 1, and put them
> > into the bottom field. The purists seem to prefer not to call this an
> > interlaced stream, as the fields in fact represents the same point in time.
> This is exactly what I was trying to do. To be precise, I use this command
> to convert the images into a yuv stream:
>
> ppmtoy4m -F 25000:1000 -I t -L
Change that (or leave it as) "-I p"!
Then send the data into mpeg2enc. You will notice that mpeg2enc
detects the progressive format:
INFO: [mpeg2enc] Progressive input - selecting progressive encoding.
INFO: [mpeg2enc] Field order for input: none/progressive
INFO: [mpeg2enc] Progressive format frames = 1
If you have 'dvdview'
http://rachmaninoff.informatik.uni-mannheim.de/dvdview/
(Note: it has problems building with gcc 3.4.x and I have no idea
how to placate the newer C++ compilers)
you can run 'dvdview -v 3 file.m2v' and see:
picture_coding_type: P
picture structure: frame picture
frame pred frame dct: true
progressive frame: true
mpeg2enc does all the work, sets the flags and everything for you.
Can't get much easier than that - can you? ;)
Cheers,
Steven Schultz
-------------------------------------------------------
This Newsletter Sponsored by: Macrovision
For reliable Linux application installations, use the industry's leading
setup authoring tool, InstallShield X. Learn more and evaluate
today. http://clk.atdmt.com/MSI/go/ins0030000001msi/direct/01/
_______________________________________________
Mjpeg-users mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/mjpeg-users
