Re: [Mjpeg-users] Compare yuvscaler and y4mscaler

[Steven M. S. <sm...@2B...>]

On Sun, 4 Jan 2004 ro...@ub... wrote:

> I am encoding from a 672x272 AVI movie.

	Ah, ok.   

> > 	Ah, I see the "-vf expand :504" in the mplayer command.   Why is that
> > 	present?   Perhaps if that was left out things would work better.
> 
> It adds black borders at the top and bottom of the video, bringing the

	I think that is what the '-I matte=' option of y4mscaler is for.

> the frame size to 672x504, which gives an aspect ratio of 4:3. Omitting
> the expansion from mplayer does not help y4mscaler.

	I didn't see the 672x272 (and thought perhaps you were coming from
	a DVD).

> mplayer also hard codes a subtitle stream into the video stream. It is
> being put at the bottom black border.

	What happens if you expand to just 480 instead of 504?   That would
	give a size of 640x480 which is also 4/3 and is a NTSC frame size.

> > 	Is the data really progressive?   If so then the 'interlace: none'
> > 	is correct.  
> 
> Yes, it is progressive.

	Ok - was curious about that because that is one of the things that
	is often not set up right in the yuv4mpeg header.

> > > Adding the option "-I norm=NTSC" to the y4mscaler command line does
> > > not help (the error message is the same from y4mscaler).
> 
> Where can I ask about it?
	
	Right here - the author of y4mscaler hangs out here on occasion ;)

	Cheers,
	Steven Schultz