how to use libvpx encode alpha

[...]

Hello, I am using libvpx to encode images with an alpha channel. Could you please provide a relevant demo program or code? Thanks Very much

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[James Zern]

Hi,

On Thu, Feb 5, 2026 at 9:57 AM '...' via WebM Discussion <webm-d...@webmproject.org> wrote:

Hello, I am using libvpx to encode images with an alpha channel. Could you please provide a relevant demo program or code? Thanks Very much

ffmpeg will encode videos or images containing alpha when using libvpx-vp8 or libvpx-vp9:

```

ffmpeg -i input -c:v libvpx-vp9 output.webm

```

You can see the source in libvpxenc.c:

  https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/refs/heads/release/8.0:/libavcodec/libvpxenc.c

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