[MEncoder-users] a question

[Tom Brinkman]

On Sunday 29 January 2006 17:33, Kirill Radzikhovskyy wrote:
> Hey, I use mencoder to convert divx movies to DVD mpg, for further
> DVD authoring,
> dvdauthor only accepts MPEG files of certain resolution that
> corresponds to PAL DVD or NTSC DVD format
> Anyways, that was just introduction
>
> to convert movies i use (copyed from manual)
>
> mencoder -oac lavc -ovc lavc -of mpeg -mpegopts format=dvd -vf
> scale=720:576,harddup -srate 48000 -af lavcresample=48000 -lavcopts
> vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=5000:
>keyint=15:acodec=ac3:abitrate=192:aspect=16/9 -ofps 25  -o
> output.mpg input.avi
>
> That works fine with input files that have aspect ratio of 16/9.
>
> However I got this really weird movie, which is like extra wide :P
> its resolution is 640 x 272.
> When I use the listed above command, it literally shrinks it to
> 720:576 (pal dvd format) and all faces become like squashed.
> I was wondering , is there a way, not to scale it , but to cut that
> extra wideness to make it usual 16/9, for proper convertion
>
> Thanks in advance,
>
> Kirill R

    640:272 is cinemascope 2.35:1  The correct aspect for wide screen 
theater movies.  For lack of a better method an understandin, I also 
use a 'copied' example to resize (mb's) movies. Often correctin 
aspect (scale) in the process. An croppin too, specially bin/cue 
stuff (after convertin to .mpg, with 'vcdxrip').

mencoder input.xxx -ovc lavc -lavcopts 
vcodec=mpeg4:keyint=132:vbitrate=2200 -vf 
crop=xxx:xxx:8:68,scale=640:272 -oac mp3lame -o output.avi

input.xxx can be several formats, eg, .mpg, bin, .avi, .vob, etc., 
maybe others.

vbitrate= can be varied to suit. I use it in conjunction with scale= 
to target either 700mb or 1400mb. Which I split to fit on CDr's. I 
try to stay above 900br.

crop= should first be run as 'cropdetect' for at least 30 seconds of 
encoding time. Allows crop to settle on proper numbers that should 
then be used when you start over. Proper crop also opens the 
opportunity to increase scale an br.

scale= as above varied, but try'n to maintain 2.35:1 for cinemascope. 
16:9 for TV like stuff, an 1.33:1 for fullscreen. The acid test is 
round things should be round, square=square, an people shouldn't look 
like 10' tall anorexics, or overly plump like the Michelin Man ;)

   EG, a movie I'm re-encodin as I type is set to 1373br, an 688:292 
to target 1400+mb's. crop wasn't needed, but I often find it's better 
to use it even when the movie doesn't need cropping. I use 
transcode's 'avisplit' to divide into < 703 mb to fit CDr's. There's 
also 'avisync' to fix A/V mismatch if needed.  Usually a 1410 or so 
mb file, will split into <703 mb parts. CDr ready

   I've done a lot of usenet d/l's this way. 100's, damn near a 1,000. 
If anyone has suggestions I'm all ears ;)  Of course this is all with 
Linux, I have no idea about that other OS

-- 
	Tom Brinkman		      Corpus Christi, Texas