[Kdenlive-devel] Where are the default project profiles?

[John T. Mertz]

IMO it is better to use proper terminology, instead of shorthand for
framerates (I.e. "29.97p" instead of "30p", "59.94i" instead of "60i"
or "30i")

This removes confusion because there is no vagueness about what the
frame rate is, whereas if you say '30p' this could mean '29.97p' or a
true 30 fps. This is less common with, say 30p, but is more critical
for formats such as 23.98p where there is a standard for shooting both
23.98p or a true 24fps, so simply using shorthand '24p' instead of
'23.98p' can be very confusing.

My recommendations for frame rates is the following:

59.94i (for interlaced NTSC)
29.97p (for progressive NTSC @ 30fps)
59.94p (for progressive NTSC @ 60fps)

23.98p (for 24p video media shot at 23.976 fps rate - most video
cameras. In this case it is ok to abbreviate 23.976 as 23.98)
24p (for true 24 fps media, typically film)

50i (for interlaced PAL)
25p (for progressive PAL @25fps)
50p (for progressive PAL @50fps)


This will make professional videographers happy :)

-JTM

P.S. I would never refer to 50i media as 25i, nor 59.94i media as
29.97i or 30i. I understand the logic behind it but this terminoligy
is atypical.


On 8/23/10, Simon Eugster <simon.eu at gmail.com> wrote:
> I noticed that in the transcode dialog we use 60i and 30p – Think we
> should try to stay consistent there?
>
> 2010/8/21 Simon Eugster <simon.eu at gmail.com>:
>> 2010/8/4 Dan Dennedy <dan at dennedy.org>:
>>> On Wed, Aug 4, 2010 at 1:24 PM, Simon A. Eugster <simon.eu at gmail.com>
>>> wrote:
>>>> On 04.08.2010 22:20, Till Theato wrote:
>>>>> -----BEGIN PGP SIGNED MESSAGE-----
>>>>> Hash: SHA1
>>>>>
>>>>> On 08/04/2010 09:38 PM, Simon A. Eugster wrote:
>>>>>> I would like to add 1080/50i there. See:
>>>>>> http://kdenlive.org/forum/choosing-video-profile-which-choose
>>>>>> But where are they stored? Couldn't find anything.
>>>>>
>>>>> Don't expect Kdenlive to reveal all its secrets ;)
>>>>> Actually they aren't in Kdenlive at all.
>>>>
>>>> I thought so; git grep usually reveals such things :)
>>>>
>>>>> Have a look at your MLT source directory: profiles/
>>>>> or on the system something similar to /usr/share/mlt/profiles/
>>>>> However there is no need to add 1080/50i. HD 1080i 25fps (or
>>>>> /usr/share/mlt/profiles/atsc_1080_50i) is the right one. "25fps" is not
>>>>> meant to be 25i and therefore 12.5p. Sounds a bit misleading though.
>>>>
>>>> Is there something like an official naming?
>>>> I mean, there are 25 full frames, but 50 interlaced frames. And isn't
>>>> the
>>>> frame rate actually 50 fps? (A half frame every 50th second?) Because
>>>> otherwise it would not make sense to store them interlaced.
>>>
>>> No, it is 50 fields per second, but the 'f' in fps means frames, and
>>> there is 25 frame per second. I used to use Hz for the vertical
>>> refresh rate, which is probably most correct, but I chose to dumb it
>>> down and keep it simple for people who are not so familiar with
>>> interlace. Those who are knowledgable should be able to understand
>>> from both the 'fps' and the other fields that are shown when selecting
>>> profiles.
>>
>> Thanks for the explanation! Clear now.
>> http://kdenlive.svn.sourceforge.net/viewvc/kdenlive?view=revision&revision=4741
>>
>> Simon
>>
>
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