As a photographer who has a few thousand of his own photos on Commons: I'd support adding AVIF, and I would use it if available.

Might the issue be related to which decoder ffmpeg uses for AV1 (libdav1d or libaom-av1)? I've been using libaom-av1 for decode in the build of ffmpeg I'm using locally.

Uploaded a 1-minute test file (AV1 with FGS). Video transcodes all error out (on both enwiki and commons).

Yes, the film grain features of AV1 were used in encoding. I had no issue using ffmpeg with this clip on my local machine; could this be an issue in an older version of ffmpeg deployed on WMF servers?

Don't know if it is AV1 that is causing the issue, but for comparison, https://commons.wikimedia.org/wiki/File:The_Kid_(1921).webm is also an AV1 file (actually, both a larger file overall and with almost 5 times the bitrate) and it transcoded just fine (uploaded on January 12).

Please add

For non-stash and async... here's an example of a failed upload (same error occurs whether the chunk size is large or small).

In T355031#9531204, @Racconish wrote:

Not sure such an upload would be fair use.

<edit> I added another file, but got it to upload myself after multiple tries.

To add: