[MEncoder-users] harddup filter

[Tobias Brockamp]

Am 23.07.2007 um 13:55 schrieb Grozdan Nikolov:

> Hi,
>
> Maybe a silly question but am I correct to assume that the  
> 'harddup' filter
> should come before the 'crop' and 'scale' filters? eg,
>
>     -vf harddup,crop=720:544:0:16,scale=512:384:0:0
>
> The reason I ask is because when I start mencoder, I see the  
> harddup filter is
> opened as the last one....

http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-vcd-dvd.html

14.8.2.2. Maintaining A/V sync

In order to maintain audio/video synchronization throughout the  
encode, MEncoder has to drop or duplicate frames. This works rather  
well when muxing into an AVI file, but is almost guaranteed to fail  
to maintain A/V sync with other muxers such as MPEG. This is why it  
is necessary to append the harddup video filter at the end of the  
filter chain to avoid this kind of problem. You can find more  
technical information about harddup in the section Improving muxing  
and A/V sync reliability or in the manual page.

>
> xvid: using library version 1.1.2 (build xvid-1.1.2)
> Opening video filter: [expand osd=1]
> Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
> Opening video filter: [scale w=512 h=384 interlaced=0 chr-drop=0]
> Opening video filter: [crop w=720 h=544 x=0 y=16]
> Crop: 720 x 544, 0 ; 16
> Opening video filter: [harddup]
>
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