[Cin] Fade black flash

[Andrew Randrianasulu]

On Thursday, June 24, 2021, Andrew Randrianasulu <randrianasulu at gmail.com>
wrote:

>
>
> On Thursday, June 24, 2021, Phyllis Smith via Cin <
> cin at lists.cinelerra-gg.org> wrote:
>
>> Camille,
>> A Freelancer has provided a fix for the fade bug in Title plugin and the
>> Dissolve transition BUT I can not
>> tell for sure if it is a correct fix (seems to work on Fedora O/S with
>> your black flash demo).  I have asked
>> IgorBeg to test if he has time.  A little more information is in BT #559.
>>
>
> i found few links that might be useful??
>
>
>
> hm, looking at this bug note it seems to use some for of gamma correction?
>
> https://entropymine.com/imageworsener/srgbformula/
>
> https://excamera.com/sphinx/article-srgb.html
>
> https://stackoverflow.com/questions/6475373/optimizations-for-pow-with-
> const-non-integer-exponent
>
>
> you might want to check speed loss after this fix, especially on slower
> machines? If speed fails down too much - may be those speed tricks can help
> Freelancer?
>


also, this link especially warn *against* using sRGB in
composition/interpolation...?

But may be in our case hidden bug was compensated by this?

more digging probably needed...


https://www.realtimerendering.com/blog/tag/srgb/



>
>
>
>>
>> If you would like to test for yourself, there is a new AppImage that
>> works on both older and newer distros at:
>>    https://cinelerra-gg.org/download/testing/cin_for_older_
>> distros.AppImage
>> For those not yet familar with using an AppImage, all you have to do is
>> download the file (does not destroy
>> your current Cinelerra) and make it executable via a window command:
>> chmod +x cin_for_older_distros.AppImage
>> and then just run it from a window via:   ./cin_for_older_distros.AppIma
>> ge
>>
>> If anyone else tests, PLEASE provide feedback -- the only problem I had
>> was that for an older Ubuntu 16 distro
>> I have to use a new $HOME/.bcast5 to get it to work correctly.
>>
>>
>>
>> On Tue, Mar 9, 2021 at 1:47 AM Camille Harang via Cin <
>> cin at lists.cinelerra-gg.org> wrote:
>>
>>> I've attached the editing file along with the PNGs.
>>>
>>> Camille.
>>>
>>>
>>> Le 09/03/2021 à 01:41, Sam via Cin a écrit :
>>>
>>> Camille,
>>>
>>> I vaguely remember such a similar case, but it was a very long time ago,
>>> hence this old work around with the fade line.
>>> However, after trying to reproduce this problem currently, I have not
>>> succeeded. It runs fine every time, just like Phyllis, without the problem
>>> you describe.
>>>
>>> My question to you. Which Cinelerra version are you using? Can you show
>>> a screenshot or short video of your timeline scenario and what parameters
>>> are set on your end so we can better reproduce the error? Maybe we missed a
>>> setting you are doing and with an exact match of the setting we can
>>> reproduce this issue. Thanks in advance.
>>>
>>> Sam
>>>
>>>
>>> Am 09.03.21 um 00:48 schrieb Phyllis Smith via Cin:
>>>
>>> Camille,
>>> Honestly, I never see a flash and I have tried several variations based
>>> on your description with the "fade in text parameter" being the easiest.  I
>>> did do a recording of it and planned to show that but the recording does
>>> not do a precise capture job so you can not tell it is working correctly.
>>> There was no flash when playing at normal speed and then I tried single
>>> stepping and still no flash.
>>>
>>> Andrea,
>>> I will try attaching a screenshot of how to set this up easily with the
>>> hopes that you can try that.  Basically, I just created about 3 seconds of
>>> nothing and added a Title plugin making sure to set the Fade parameter on
>>> the Title menu to 3.0 seconds (I use the reset button first to make sure
>>> there are no leftover weird settings).
>>>
>>> On Mon, Mar 8, 2021 at 8:22 AM Camille Harang via Cin <
>>> cin at lists.cinelerra-gg.org> wrote:
>>>
>>>> Hi Sam, thanks for your reply, yes the fade line works, however it's
>>>> not suitable for what I want to do, I want to fade many snippets of text
>>>> and transparent PNGs on the same track, with always the same video
>>>> transition filter set to the same duration. Otherwise it's too complicated
>>>> to combine them on two tracks and adjust manually the fade curve for each.
>>>> I posted the example of fade in text parameter as it's simpler than
>>>> transition do explain, but it produces the same "black flash" bug.
>>>>
>>>> Thank you,
>>>>
>>>> Camille.
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Cin mailing list
>>> Cin at lists.cinelerra-gg.org
>>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>>
>>
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