png - MLT transparency of watermarks and tracks not working

Question

I am trying to get melt to work, but it seems, it doesn't support transparency (alpha channels)! Using the official watermarking example, I get a black background behind the PNG and don't see any video through.

melt \
test.mp4 out=1000 \
-track \
watermark1.png out=1000 \
-transition composite fill=1 in=0 out=1000 a_track=0 b_track=1 geometry=85%/5%:10%x10% sliced_composite=1 \
$*

I installed melt via "brew" version 6.20.0 on a mac, obviously.

Any help would be much appreciated!

Answer 1

你的命令非常适合我。我在 Windows 上，我使用了 Shotcut 附带的 melt.exe 命令。也许你的融化版本中缺少一些东西。考虑从这里下载 Shotcut：

https://shotcut.org/download/

然后，使用包含的 melt 版本来尝试您的命令。

另外，您确定您的 png 文件具有透明背景吗？对不起，但我只需要问一下。