Bug: AVIF conversion just changes the file type, the size stays the same to the byte

[kazerniel]

Describe the bug
I tried manually converting some images to AVIF: JPG and WEBP book covers and a JPG photo with lots of details. In every case the file got converted to AVIF (I have the "revert to original if larger" option ticked), but the file size is the exact same bytes as the input size. I find this extremely implausible to happen, unless there's some bug in the process. The images still display after the conversion as normal.

To Reproduce
Steps to reproduce the behavior:

1. Pick a fairly detailed, slightly compressed JPG, like this one
2. Right click, Convert/compress, to AVIF with the settings on the screenshot below
3. See that the file is now AVIF, but the file size is the exact same to the bytes, as the original

Screenshots

Desktop (please complete the following information):

• OS: Win10
• CPU: AMD Ryzen 5 3600
• Obsidian version: 1.10.6

[kazerniel]

I wonder if it's related to #363, as the conversion modal often hangs after pressing the Process button, and I have to Cancel it, and only see it afterwards that the file was actually converted.

[kazerniel]

Turns out that while AVIF conversion is affected, WebP conversion works all right, so it may indeed be an issue with ffmpeg.