[MPlayer-users] Converting DivX4 -> MPEG ?

[D Richard Felker III]

On Mon, Oct 27, 2003 at 09:33:10AM +0100, Levente Novák wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> >
> >
> >IMO SVCD should *never* be used for archival or distribution purposes
> >because it (a) loses lots of resolution, and (b) wastes lots of bits
> >on black borders, lowering quality beyond the already bad compression
> >of mpeg2.
> >
> For archival purposes, the best option is to use a lossless codec (like 
> HuffYUV, FFV1, LJPEG) at a resolution at least the Nyquist frequency of 
> your source (generally twice that of the number of analog "lines" your 
> capture standard uses). Unfortunately they all give huge files. But you 
> can be sure that all the information you got from your capture card will 
> be preserved, especially if the colorspace is the same you used with 
> your capture card (most cards sample 4:2:2 internally, so there is no 
> need to use 4:4:4 or RGB though).

Who said anything about capturing? We're talking about dvdrips here...
:)

> For distribution, it's right that MPEG-4 compresses better than MPEG-2. 
> With camcorder (moderately noisy) sources however, I prefer sometimes 
> MPEG-2 to the less blocky MPEG-4 but where blocks tend often to "stick" 
> to the foreground on scenes when the camcorder is moving while shooting. 
> It's maybe only specific to my sources and my taste, I'm not saying this 
> is a general solution.

Use the mpeg_quant option to lavc, and/or denoise your input before
encoding.

Rich