[MEncoder-users] Need help reducing 720p 60fps to 30fps or 24fps

[Chris Capon]

On 2010-01-20 15:29, Laine Lee wrote:
> This was as close as I could get with your sample. Is there a chance that
> the recording might contain dropped frames? The parts of my results that
> seemed most jerky appeared so sporadically.
>
> mencoder [debug-sample.mpg] -oac lavc -ovc lavc -of mpeg -vf
> tinterlace=4,filmdint=io=30:24/fast=0,softskip,harddup -noskip  -fps
> 60000/1001 -ofps 24000/1001 -mpegopts format=dvd:tsaf:muxrate=40000 -af
> lavcresample=48000 -lavcopts
> vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vstrict=0:aspect=16/9:a
> codec=ac3:abitrate=384:keyint=15:trell:mbd=2:vbitrate=6000 -srate 48000 -o
> [debug-sample_done.mpg]
>
> Laine Lee
>
>    
Laine, thanks for going above and beyond again.  I appreciate it.  The 
tinterlace=4 setting does seem to give the best results so far and I'll 
go with these settings.

The sporadic motion is still coming from the few frames which have 
interlace artifacts.  They break the 3:2 pattern on an irregular basis 
and I think filmdint doesn't have a way to handle them.  I hoped there 
were other tricks for dealing with poorly deinterlaced progressive video.

There probably aren't any dropped frames in this clip.  It comes from a 
digital TV broadcast and I would expect transmission errors to show up 
as decoding errors on the MPEG-TS container.  It is more likely the 
interlace artifacts are a result of how the original film was prepared 
for broadcast.

Again, thanks for your help.
Cheers,
Chris.