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Hi Clay,

In the discussion about grouping and locking, we touched the question
how to attach effects. Just some additional notes...

> On 10:49 Thu 24 Jul, Ichthyostega wrote:
>> Regarding Effects:
>> - you have effects in a global bus insert (e.g.
>>   global deinterlacer)
>> - you have effects on some timespan, irrespective of the content.
>>   This kind of effects are very frequently combined with automation.
>> - you have effects applied to a whole clip
>> - you have effects which need to be applied to a specific source media
>> - you have effects applied just to a part of a clip,
>>   typically with automation
>> - you have the situation where an effect spans a transition.

Clay Barnes schrieb:

> None of the rendering effects is at odds with my idea in the least, 
> though I need to work out a good representation of effects tied to
> the absolute last output rather than any one meta-track (i.e. global 
> effects).

for the global ones, I'd propose to handle them like the inserts in a
mixing desk. I think it's helpful to have a section of global mixing
busses. At least for sound it is. It would allow the sound editor to
do the standard work in-application (and only do the mastering stuff
in a separate DAW like Ardour or Pro Toools)

For the GUI this would mean to have an additional window with channel
stripes, one for each global output and one for each, additional
(optional) global subgroup mixing bus.
The implementation in the proc layer is almost trivial: the internal
behaviour of a global bus and a single clip in the timeline is almost
entirely identical. Internally, both form a processing chain or "pipe"
(as I call them internally in the proc layer code), starting from a
source port and going through a couple of effects and fader components
and end with a mixing step (the latter will be inserted automatically
on demand by the builder which does the internal wiring).
So the only difference would be, that a clip has a start and end point,
while such a "global pipe" or bus is always there. And, of course, the
GUI representation would be different.


Another point. In the enumeration above I wrote:
>> - you have effects which need to be applied to a specific source
>> media.

Obviously, this is a fine use case for meta-clips. You would put e.g.
the footage of one camera which needs to be colour/contrast corrected
in such a meta clip, do the necessary adjustments and then cut the
meta clip into the main EDL as if it was another source clip.

Cheers,
Hermann V.


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