[MPlayer-users] libavcodec mpeg4 - blocky clip

[drwhat]

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On Tuesday 29 April 2003 11:33 pm, Michael Waters wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi,
>
> I came across a clip from a dvd which is difficult to encode well with lavc
> mpeg4.  I tried several different options and with bitrates between 750 and
> 2000 kbs.  The encoded file ends up very blocky especially in the moving
> grass and in the sky during scene transitions.
>
> If you look in divx2pass.log, lavc seems like it's possibly not sensing
> motion or something and assigns q values which are too large. (...just my
> uninformed guess :) ).  In case the clip is useful in improving libavcodec,
> I uploaded to incoming/ :
>
> wtness_lavc_enc_prob.avi
> wtness_lavc_enc_prob-encoded.avi
> wtness_lavc_enc_prob.txt
> wtness_divx2pass.log
>
> I'm using mencoder 0.90.  It's about 70sec and for the encoded file, I
> used:
>
> mencoder wtness_lavc_enc_prob.avi \
>  -vop denoise3d,scale=656:352,crop=706:480:8:0 \
>  -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1200\
>
> :vhq:v4mv:keyint=300:vlelim=-4:vcelim=9:lumi_mask=0.05:dark_mask=0.01:vpass
> :=1 \
>
>  -oac copy  -o wtness_lavc_enc_prob-encoded.avi
>
> ...and vpass=2 for the 2nd pass.
>
> Michael

have you tried something like 

 -lavcopts vcodec=mpeg4:vbitrate=1200:v4mv -vop pp=lb
									 ^^^^^^^^^^^^^^^^
I had the same problem, till I added in those.....
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