[MPlayer-users] Re: [-] Crop before deinterlacing OK? NO

[Tobias Diedrich]

Rich Felker wrote:
> On Wed, Jul 20, 2005 at 09:18:34PM +0200, Tobias Diedrich wrote:
> > Rich Felker wrote:
> > 
> > > > How about using "-ofps 120000/1001"  :-)
> > > 
> > > Be aware this will use about 50 megs per hour in overhead because the
> > > avi format sucks. Otherwise it will work. Just make sure you don't use
> > > harddup, btw... :)
> > 
> > Maybe I'm mistaken, but I think it's only slightly over 2.6 megs per hour:
> > 
> > Assuming 24000/1001 fps content this should be 96000/1001 fps
> > duplicate frames.
> > 
> > 96000/1001 fps * 3600 seconds * 8 bytes per 'duplicate frame' / 1024 / 1024
> > 
> > => 2.634 MB/h
> 
> 8 bytes? Nope, 24 bytes. And I was talking about total avi overhead,
> not the additional overhead compared to 24000/1001 time base. So I
> guess the correct number is 10 megs per hour, or something like that.
> Sorry my original estimate was off by that much.. I thought I'd
> calculated it before and gotten something like 50. Maybe the 50 was
> for vorbis-in-avi with this same method..

Ok, I didn't include the index, which stupidly includes
non-keyframes and duplicate frames and adds 16 Bytes per chunk...
(I wrongly assumed that dupes wouldn't have to be indexed...)

At least 10 megs still doesn't sound quite as bad as 50 :-)

-- 
Tobias						PGP: http://9ac7e0bc.uguu.de