Certainly! Here is an example command that changes the exposure of a series of images using ffmpeg, encodes the output using the AV1 video codec, and saves the output as an MKV file:
```
ffmpeg -i image-%d.png -vf "curves=levels=0:0.5:1" -c:v libaom-av1 -pix_fmt yuv420p output.mkv
```
In this command, the -c:v option specifies the video codec to be used for encoding the output video. Instead of libx264, we're using libaom-av1, which is the AV1 codec.

The -pix_fmt option specifies the pixel format for the output video, which is set to yuv420p in this example.

Finally, the output file is named output.mkv, which saves the output as an MKV file instead of an MP4 file.
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