Ok, I think I'm a step further: to keep colors correct from image sequences to the final QT, I found that it helps to use a 'colormatrix=bt601:bt709' on the background. Working fine when I use this as the only color filter. But when adding it with my overlay like this:
-vf "movie=watermark.png [logo]; [in]colormatrix=bt601:bt709[cc]; [cc][logo] overlay=format=rgb:x=831:y=982 [out] the colormatrix changes the background video much more than when I use it without the overlay. Anyone knows how I would add this colormatrix stuff before I do the overlay? I'm quite new to this whole FFmpeg filter stuff, so I may have this setup quite wrong. Would it be better to use 'filter_complex' method? Thanks, Abraham Am 07.08.2014 um 18:02 schrieb Schneider, Abraham: > Hi there! > > Sorry for abusing this group a little bit, but I have no idea where to ask > this and maybe there are some people here who ran in the same problem already: > > I want to use FFmpeg to convert JPEG image sequences to Quicktime movies. All > working fine so far. Now I also wanted to add text burnins and overlaying of > the company logo. Text is also working fine, but the logo gets me strange > results: > > I'm using the '-vf "movie=watermarklogo.png [watermark]; [in][watermark] > overlay=10:10 [out]"' method. Problem is: as soon as I add this logo to my > ffmpeg rendering, the color of my underlying video changes. It gets kind of > brighter, or a gamma shift or so. > > I tried a premultiplied PNG, an unpremultiplied, same wrong result for the > background. > > Does anyone know if it is possible to overlay a logo over a background in > FFmpeg without changing the background, like a normal 'over' in Nuke? Any > hints on how to do that and/or what might be wrong on my solution at the > moment? How should the PNG file look like? 3 channels? 4 channels? > Premultiplied? > > Thanks for any help, > > Abraham > > > Abraham Schneider > Head of VFX pipeline / VFX Supervisor > > > Türkenstr. 89, 80799 München / > Phone +49 89 3809-1096 > > EMail [email protected] > > Visit us on Facebook!________________________________ > > > ARRI Film & TV Services GmbH > Sitz: München Registergericht: Amtsgericht München > Handelsregisternummer: HRB 69396 > Geschäftsführer: Helge Jürgens, Josef Reidinger > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users _______________________________________________ Nuke-users mailing list [email protected], http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
