[MEncoder-users] Progressive DVD duplicate frame , skipping frame error

[scowl at wballphotos.com]

On Wed, 07 Dec 2011 22:17:58 -0800, Jason Cumiskey 
<jason.cumiskey at gmail.com> wrote:
> I am encoding a purely progressive dvd and am running into either 
> duplicate frames or skipping frame issues.  As I understand from the 
> mencoder docs, purely progressive content should use:
> -ofps 24000/1001
>
> but this produces skipping frame errors about 1 a sec. 
>
> If I omit that, I get a duplicate frame error about 1 a sec. 

Try -noskip and possibly -mc 0 with -ofps 24000/1001. If the input and 
output are both purely 24000/1001 then no frame should ever be skipped 
or duplicated. 

> Looking at some of the resulting video, I don't really see problems 
> with either. 

Step through the frames where the skipped frames and duplicates were 
encoded. You will probably find that a frame is being skipped or 
duplicated. In many cases you won't notice at normal speed but in some 
cases like pans and action scenes the skipped frames will be annoying. 

I have to use -noskip when encoding progressive material with x264. If 
I don't it will duplicate every 11th frame and drop a frame 11 frames 
later to compensate for the extra frame. Oddly I don't need -noskip 
when encoding with xvid. I don't know why.