avif: allow at least two images

Christopher Degawarequested to merge
1480c1/SVT-AV1:avif into master

Description

This is an attempt at getting the encoder to accept more than just one frame in avif mode.

For this attempt, I just removed the guard around avif mode only allowing 1 frame and adjusted some values until the encoder accepted and encoded 2 frames and dav1d decodes the resulting file properly. This is a draft, as we still need to determine if there's any other side effect, beyond memory usage changing.

Issue

Author(s)

@1480c1

Performance impact

  • quality
  • memory
  • speed
  • 8 bit
  • 10 bit
  • N/A

Test set

  • obj-1-fast can be found here
  • other
  • N/A

Merge method

  • Allow the maintainer to squash and merge when PR is ready to create a 1-commit to the master branch. The maintainer will be able to fix typos / combine commit messages to create a more readable 1-commit message or use whatever is stated in the 'Description' section
  • I will clean up my commits and the maintainer shall use 'rebase and merge' to the master branch

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