On Sun, Jul 16, 2017 at 08:26:57PM +0200, Peter Große wrote: > On Sun, 16 Jul 2017 18:33:33 +0200 > Paul B Mahol <one...@gmail.com> wrote: > > > > > how can one reproduce this bug? > > ffmpeg -i fate-suite/mfx/track_01_v02.mxf -filter_complex \ > "movie=fate-suite/png1/lena-rgba.png[logo];[v:0][logo]overlay" -an -vframes 1 > out.png > > In this example files from the fate suite are used. > > The source mxf file actually doesn't have an alpha channel, but the > autoscaler adds one on adapting pixel formats: > > [auto_scaler_0 @ 0x2118440] w:1280 h:720 fmt:yuv422p sar:1/1 -> w:1280 h:720 > fmt:yuva420p sar:1/1 flags:0x2 > > As seen here [1] the png file has a almost zero alpha value on the left side, > but the output is way too bright without the patch. > > I hope this helps. > > Regards > Peter > > [1] http://imgur.com/a/74ZF4
please also add a fate test for this [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Never trust a computer, one day, it may think you are the virus. -- Compn
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