[FFmpeg-user] Reversing PAL->NTSC telecining.

[Nicholas Robbins]

> On Monday, January 6, 2014 7:41 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> > Nicholas Robbins <nickrobbins <at> yahoo.com> writes:
> 
>>  >>  >>  >>  If you recall, something about how mplayer 
> dumps its 
>>  >>  >>  >>  vobs labels them as ~60fps, when they are 
> really ~30.
>>  > 
>>  > I would like to look at this issue (if it is reproducible.
>>  > (The fps filter should not be necessary.)
>> 
>>  So, do you want the output of perhaps
>> 
>>  mplayer -dvd-device /dev/sr0 dvd://1 -dumpfile out.vob 
>>  -dumpstream -endpos 2M
> 
> Correct.

uploaded robbins.vob and robbins-vob.mkv. robbins.vob is the result of 

mplayer -dvd-device /dev/sr0 dvd://2 -dumpfile robbins.vob -dumpstream -endpos 2MB

and robbins-vob.mkv is the result of mkvmerge -o robbins-vob.mkv robbins.vob

it looks like it may be a problem with mkvmerge or how the ffmpeg tools look at mkv's.

>>  >>  a) -vf fps=30000/1001,fieldmatch,decimate=6
>>  > 
>>  >>  won't a) leave interlaced frames?
>>  > 
>>  > Only for very badly cut material.
> 
>>  the ffmpeg docs suggest including yadif.
> 
> It also suggests that fieldmatch is better than 
> pullup but I still haven't seen a sample that 
> shows this (it is much slower though).
> 
>>  fieldmatch=order=tff:combmatch=full,yadif=deint=interlaced,decimate
> 
> I think this does not always work correctly so you should 
> probably only use it if necessary for your sample.
> 
> Carl Eugen

What would "not work correctly" look like?

-Nick