mencoder to go from mpeg2 -- xvid

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mencoder to go from mpeg2 -- xvid

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greysky

Newbie

8. October 2005 @ 13:34

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Here's the script I'm currently using to encode MPEG2 (720x480) --> xvid (512x384) on win32 using MPlayer-mingw32-dev-CVS-050928.

///batch file///
mencoder -ovc xvid -vf scale=512:384 -sws 9 -xvidencopts pass=1 -nosound -o test-1.avi test.mpg
mencoder -ovc xvid -vf scale=512:384 -sws 9 -xvidencopts bitrate=1100:pass=2 -oac mp3lame -lameopts fast:preset=standard -o test-final.avi test.mpg
///end of batch file///

Firstly, there are several questions I have for people who know:

1. Am I missing any options?
2. How can I alter this to be a 3 or 4 pass encode?

Secondly, when I use that script I do get a file out that plays under Windows (mplayerc) just fine; however, one problem is that the resulting file has problems in virtual dub and virtualdub mod giving an error, "Warning: nothing to output bframe decoder lag."

Also, if I demux the mp3 file and analyze it with mrquestionman or encspot, I don't see the correct results. Mrquestionman usually shows the switches one used to encode (in this case --alt-preset fast standard). Additionally, the vbrheader is all messed up. The bitrates usually jump between 128,224,256 etc. in normal files. The demuxed file just hovers around 190 jumping by 1 kbps or so.

Can anyone suggestion what I'm doing wrong?

[ + quote]

celtic_d

AfterDawn Addict

8. October 2005 @ 22:19

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1. You are missing -passlogfile.
2. Doesn't look like you can since pass only accepts 1-2.

That is because the default settings are 2 bframes without packed bitstream and you are decoding via VfW. VfW can't properly handle bframes, the message is inserted by the decoder, however I thought it was removed and replaced with a black frame some time ago?

[ + quote]

greysky

Newbie

9. October 2005 @ 02:49

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Thanks for the reply. I lookedup the passlogfile switch in the manual and this is what it said:

Quote:
−passlogfile <filename>

Dump first pass information to <filename> instead of the default divx2pass.log in two pass encoding mode.

Doesn't that just allow me to rename the log file?

About the 2 pass, you're right, I was reading the section on vpass=<1-3> and got confused... what's the difference?

[ + quote]

http://ecoding.n3.net <--- for all your CD and DVD backup needs!

celtic_d

AfterDawn Addict

9. October 2005 @ 17:16

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vpass is for libavcodec. So you could for instance run three passes with libavcodecs mpeg-4 codec.

Better to specify a log file I think so as to not overwrite/use the wrong one.

[ + quote]

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