Yes, seems to be a problem, but I have no idea what the repercussions of the patch would be based on the following in the release notes for September 2020 which says in the Bugs/Issues fixed: "Alpha is being set to 1 for background color always now – just a missing thing."
On Fri, Nov 11, 2022 at 5:31 AM Andrew Randrianasulu < [email protected]> wrote: > User 'goat' reported cingg failed to create png sequence with alpha, even > if proj set to rgba and png settings also include alpha. > > I ..spend a lot of tume in filepng and fule, until it dawned at me Ican > check older cingg! > > Bug was not there in june 15 2020 selfbuild. > > And bug was present in 09 30 2020 ubuntu 16 static tar ... > > > So I searched git log and found this commit > > > https://git.cinelerra-gg.org/git/?p=goodguy/cinelerra.git;a=blobdiff;f=cinelerra-5.1/cinelerra/virtualvconsole.C;h=3c3fb86f5710e15954c927f358210027cb819ed1;hp=193761b6763a61d11b0b85c8edbb4ec658df2b99;hb=abdff69b9309c7d5cd2ed6ce17dd2e0d85aef9a1;hpb=0b751b07a28e84a721b2bb76083db6629aa26d73 > > > i tried to set alpha to 0 (zero) in virtialvconsole and suddently pngs and > exrs and tgas got their alpha back! > > > How to check: > > Load video into cingg > Set format to rgba-8 bit > Set Alpha plugin over video, with parameter 0.5 > or use fader. > Set output render to one frame, png, use alpha. > > Render > > While image will be with right format alpha will be absent as evidenced > by gimp's colorpicker. > > patch cingg with attached patch, hope alpha will be back! > > > But of course we better to re-test video formats with alpha too ... (just > not sure how) > > note, ffmpeg's png encoder worked ok, and so did tiff encoder. But > png/exr/tga were all busted wrt alpha. > > >
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