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
pgpGcQkvmntOo.pgp
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