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I have a series of PNGs that have transparent backgrounds. When I place them on the strip in Video Editing and render, the background on the video is black.

I've made certain that the Transparent box is checked, and that any file formats, container or codec selections allow for RGBA, before rendering animation. Still, the background of the video turns out black!

The file is here, and I'm desperate (and appreciative) for direction: waving flag

I would like to render the PNG files, within the Sequencer, as an mp4, WITH A TRANSPARENT BACKGROUND. Hope this is descriptive enough to gather a response?

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  • $\begingroup$ Did you expressly set a background color? $\endgroup$ Feb 25, 2020 at 21:35
  • $\begingroup$ What is your preferred final output? AVI ... FFMpeg? PNG? $\endgroup$ Feb 25, 2020 at 21:40
  • $\begingroup$ Please show your desired settings as a well planned Blender screen capture. $\endgroup$ Feb 25, 2020 at 21:49
  • $\begingroup$ What's your question? How to compile a video file with transparent background? If so, you'll have to encode your files to 10bit prores/dnxhd or avi uncompressed which I don't think is supported by blender, Further reading: en.wikipedia.org/wiki/Avid_DNxHD $\endgroup$
    – brockmann
    Feb 25, 2020 at 21:56
  • $\begingroup$ Do you want to render PNGs from a collection of other PNGs? $\endgroup$ Feb 25, 2020 at 22:04

1 Answer 1

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Expressly set a background to the color of your choice. Shift A ... then choose color. Show the sidebar with N. Then pick a new color such as blue or red. For many video types there is no transparency, there is a final color calculated, which may be black by default.

If you are merging transparent PNGs into a sequence of PNGs, then choose a sequence of you PNGs as your output. There is also OpenEXR which may require a little more work to see in your default operating system if the occasion arises.

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  • $\begingroup$ If the question is how to compile a transparent video file out of RGBA pngs, this answer is way off. $\endgroup$
    – brockmann
    Feb 25, 2020 at 22:05
  • $\begingroup$ Yes, Brockmann, the question is "How to render a video file with a transparent background, using PNG image in sequence. $\endgroup$
    – jmarkt
    Feb 26, 2020 at 0:23
  • $\begingroup$ Could please add that to your question as requested to re-open it? Also see my comment here @jmarkt $\endgroup$
    – brockmann
    Feb 26, 2020 at 6:22
  • $\begingroup$ As it turns out, in spite of the background being black, it DOES produce transparency when rendered as Alpha Over and placed over a video strip in VSE. $\endgroup$
    – jmarkt
    Feb 27, 2020 at 20:10

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