[MPlayer-users] Horrible Compression Artifacts in High Motion Scenes

[Kichigai Mentat]

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On Oct 3, 2005, at 16.40, Rich Felker wrote:

> On Mon, Oct 03, 2005 at 10:43:06AM -0500, Kichigai Mentat wrote:
>
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>> Hello. I'm attempting to compress a video with the following command
>> line:
>>
>> mencoder INPUT -o OUTPUT -nosound -ovc lavc -lavcopts
>> vcodec=mpeg4:vpass=3:aspect=16/9:idct=8:trell:vmax_b_frames=0:vqmax=3 
>> 1:v
>> hq:v4mv:vrc_eq=tex:vfdct=5:dia=-1:vbitrate=1200:vrc_minrate=650:vrc_m 
>> axr
>> ate=2500:vrc_buf_size=1835 -vf
>> crop=720:464:0:8,filmdint=dint_thres=256,pp=lb -ofps 29.976
>>
>
> Where did you get this command line? vhq is old and equivalent to
> mbd=1; mbd=2 is usually considered better. overriding idct/fdct is
> unnecessary and may be a bad idea. dia=-1 is probably experimental, no
> idea if it works well. minrate/maxrate/bufsize ALWAYS lower quality
> and are just for making bitrate-restricted encodes for dvd/vcd/etc.
>
> Finally and most importantly, don't set vrc_eq unless you understand
> it. Setting it to tex is probably a bad idea.
>
> Somehow I have a feeling your deinterlacing is bad too, since you're
> using such nonsensical options in general.
Well, that's the one part I pulled off of an earlier discussion from  
the mailing list. The discussion was actually about whether one  
should crop before or after interlacing, but it eventually spun off  
into different kinds of deinterlacing methods, so I pulled from both  
parts.
>
>
>> My guess was with that kind of a bitrate, there would be enough
>>
>
> 1200 is not terribly high, but should work plenty well for live action
> content (as opposed to anime which might show artifacts).
Well, it's got mixed content. It's not detailed animation, but rather  
semi-crude cell animation with a lot of reused (like repeating  
backgrounds you'd see in older cartoons).
>
> Rich
>
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>

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