[CinCV TNG] [PATCH] Removed can_copy_from from file* sources

Einar Rünkaru einarrunkaru at gmail.com
Sat Jul 15 22:08:09 CEST 2017



On 07/15/2017 10:51 PM, igor_ubuntu wrote:
> 
> 
> 2017-07-15 22:40 GMT+03:00 Einar Rünkaru <einarrunkaru at gmail.com 
> <mailto:einarrunkaru at gmail.com>>:
> 
> 
>     On 07/15/2017 10:11 PM, igor_ubuntu wrote:
> 
>         АFAIU
>         If a user want to get directly copied frames, he should set:
>         1 video track, no effects, input and output have the same size,
>         input and output media is all I-frames.
> 
>         Then he goes to File/Render and set the same parameters as in
>         original.
>         If the parameters are not exactly the same (or (for example) if
>         he had a effect on track), the user will get reencoded result.
> 
>         Right ?
> 
> 
>     Yes. When cinelerra decides to copy frame, rendering parameters
>     affecting the result are ignored. DV hasnt any.
> 
> 
>     Einar
> 
> 
> But if a user sets the same parameters as in original (+ no effects, 
> ...), he will get directly copied frames. Right ?
> 

Rendering parameters are ignored. For example if source PNG list has no 
alpha, but user sets 'use alpha' in rendereng parameters, the direct 
copied frames have no alpha, renderd have alpha.

You may get no visible effect, because on your test case cinelerra does 
not use direct copy because of unrevealed bug or color conversion does 
not create visible effect.

I never tested the direct copy, so I can't be sure that it works. But 
there have been reports some 5-10 years ago.

Einar


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