[MEncoder-users] rip dvd to mkv, ogm, mp4 script

[Martin Matusiak]

On Tue, Oct 14, 2008 at 4:28 PM, James Hastings-Trew <jimht at shaw.ca> wrote:
> Martin Matusiak wrote:
>> Hello James,
>>
>> That was quite a handful. Is this "it" on deinterlacing? As in all of
>> the possible cases that can be used as a universal strategy?
>>
>>
> It's not perfect - nothing is. I've encoded a lot of DVDs into .avi and
> .mp4 formats, and you can always be thrown a curve-ball or find
> something in a title that goes outside norm.
>
> Examples:
> Just about every Disney DVD I've encountered has the main film at
> 23.976, but the very start of the movie has several frame rate switches
> from video to film for the various logo and title cards that come up
> first. This could confuse the algorithm I outlined into believing that
> the title is "mixed" frame rate, when it is just film with some wonky
> stuff at the start. The best workaround is to do the detection on the
> 2nd chapter, rather than the first.
>
> Every Simpsons episode is done at film rate, but the intro has several
> video edits and inserts (the part where Bart draws on the blackboard is
> interlaced video, for example), and there will be several edits that
> break telecine cadence throughout the episode. The thing should be
> treated as "mixed" because the vast bulk of the video is actually
> progressive film but there are so many edits at the start that it will
> fool the algorithm into thinking it is video.

These two problems seem to occur because you're only seeing the start
of the title. Suppose you could see all of it, would the heuristic
draw the right conclusion?

> Japanese Anime DVDs can be particularly problematic, especially if the
> material was originally done for TV, because they have a tendency to
> hard telecine the progressive material, and then mix in video-rate
> scenes and edits. The algorithm might decide that these are "mixed"
> rate, but really should be treated as video.

And this one just seems like an anomaly from the rule.

You make a distinction between film and video, could you explain that?