[MPlayer-DOCS] encoding guide draft

[Nico Sabbi]

D Richard Felker III wrote:

>
>II.2. Constraints of DVD, SVCD, and VCD
>
>Unfortunately, the DVD, SVCD, and VCD formats are subject to heavy
>constraints. Only a small selection of encoded picture sizes & aspect
>ratios are available. If your movie does not meet one of these, you
>must scale and crop or add black borders (which are bad for quality!)
>to make it compliant.
>
>Format      Resolution  V.Codec A.Codec           FPS    Aspect
>NTSC DVD    720x480 *   MPEG-2  MP2,MP3,AC3,PCM   24,30  4:3,16:9
>NTSC SVCD   480x480     MPEG-2  MP2               30     4:3
>NTSC VCD    352x240     MPEG-1  MP2               24,30  4:3
>PAL DVD     720x576 *   MPEG-2  MP2,MP3,AC3,PCM   25     4:3,16:9
>PAL SVCD    480x576     MPEG-2  MP2               25     4:3
>PAL VCD     352x288     MPEG-1  MP2               25     4:3
>
>* DVD also offers other resolutions but they are usually not
>  desirable.
>  
>

mp3 is neither permitted nor frequently supported by players;
for dvd x=704 is standard and very useful, because it often permits to 
crop without rescaling