Need some help with MEncoder commandline, please

[zehd]

Hi all. I'm doing finishing touches on a new version of ZProcess where it will now use MEncoder to transcode files.

One thing I can do with FFmpeg is create a video rectangle inside a 4x3 field that may not necessarily be centred. Here's an example, including the commandline that would create the rectangel...

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Code:

"C:\Program Files\devnz\gbpvr\Third Party\FFmpeg\ffmpeg.exe" -y -i "C:\TV\Recorded\Battlestar Galactica\Battlestar.Galactica-S03E08-Hero.avi" -target ntsc-dvd  -deinterlace  -b 4000000 -vcodec mpeg2video -ab 224 -ar 48000 -acodec mp2 -ac 2 -r 23.976023976024 -s [B]560x308[/B] [B]-padtop 64 -padbottom 108 -padleft 56 -padright 24[/B] -aspect 4:3  "C:\TV\Override\Battlestar.Galactica-S03E08-Hero.mpg"

With ffmpeg, I can play with the padding. The resulting padding + Rectangle size equals a 640x480 video...

In Mencoder, when I create the same size rectangle, it is automatically centred vertically and horizontally, within the field

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Code:

"C:\Program Files\devnz\gbpvr\Third Party\mplayer\mencoder.exe" -oac lavc -ovc lavc -of mpeg -mpegopts format=dvd:tsaf -vf lavcdeint,scale=[B]560:308[/B],expand=[B]640:480[/B],harddup -srate 48000 -af lavcresample=48000 -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=4000:vbitrate=4000:keyint=15:acodec=mp2:abitrate=224:aspect=4/3  -fps 23.976 -ofps 23.976023976024 -o "C:\TV\Override\Battlestar.Galactica-S03E08-Hero.mpg" "C:\TV\Recorded\Battlestar Galactica\Battlestar.Galactica-S03E08-Hero.avi"

With the MEncoder docs, it say that I can create hieght and width of a rectangle and define the x,y coordinates of the start of that rectangle, which would be great (I can create that code in ZProcess).. I just can't get it working...

http://www.mplayerhq.hu/DOCS/man/en/mplayer.1.html

I think it's in the scale or expand, but everything I do has the rectangle centred...

Any ideas?

Thanks
Frank

[-stattik-]

Are you trying to crop the video or encode add black space around it? I've probably got a snippit somewhere.

[zehd]

Are you trying to crop the video or encode add black space around it? I've probably got a snippit somewhere.

Yeah, I'm trying to take a 16:9 video aspect ratio and letterbox into a 4:3. The problem is, that many of the avis guys have, don't have set aspect ratios or resluotions...

ZProcess already calculates the required padding. So I just need to be able to designate my own values for top, bottom, left and right padding, lie I can do with ffmpeg...

It would be great if you could get me in the right direction

Thanks

Frank

[-stattik-]

expand=-80:-172:56:64 should do the trick although I'm not able to test this at the time. If you don't mind me asking, why would you not want to center the picture in the frame?

[zehd]

expand=-80:-172:56:64 should do the trick although I'm not able to test this at the time.

Thanks Stattik... I'm gonna try this...

If you don't mind me asking, why would you not want to center the picture in the frame?

Great question. Well first of all, the actual 4x3 field that is sent to an MVP, overscans, and is not always centred itself. (Possibly a symptom of an older TV too) With this tweaking, I'm able to optimize the picture so that there is absolutely no cut off.

And my Wife is insistent on having a OSD clock from her TV, and I hate how it overlays in the bottom left of the screen, usually over some writing or something. So I also shift the whole kit and kaboodle up above that. It ends up creating a Letterbox that's actually placed similarily to the first illustration in my first post...

[Ted the Penguin]

And my Wife is insistent on having a OSD clock from her TV

ouch, NFG

[zehd]

ouch, NFG

And that's the inspiration for ZProcess....

[HtV]

And that's the inspiration for ZProcess....

I can feel it...........there's love in the air.

[zehd]

BTW, I got that command thingy working... Thanks