[Cin] Fade black flash

[Andrew Randrianasulu]

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?




>
> 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.AppImage
>
> 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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