contrib: aom: update to 3.13.0

• New Features

  • New tuning mode AOM_TUNE_SSIMULACRA2 for the AOME_SET_TUNING codec control (--tune=ssimulacra2) in all-intra mode. The feature detection macro AOM_HAVE_TUNE_SSIMULACRA2, if defined, indicates that AOM_TUNE_SSIMULACRA2 is available. AOM_TUNE_SSIMULACRA2 was developed to maximize SSIMULACRA 2 scores.
  • New codec control AV1E_SET_SCREEN_CONTENT_DETECTION_MODE (--screen-detection-mode). This codec control helps select between two screen detection modes:
    • Mode 1: standard (default)
    • Mode 2: anti-aliased text and graphics aware
  • New codec control AV1E_SET_ENABLE_ADAPTIVE_SHARPNESS (--enable-adaptive-sharpness). When enabled, it modulates sharpness based on frame QP, which helps mitigate blocking artifacts in the low to medium quality range.
  • Added low complexity decode mode for 720p vertical videos.
  • ROI feature implemented for RTC: for delta QP, skip encoding, and reference selection.
  • External scaling feature for SVC: allow downscaled images to be passed into encoder for spatial layers without reconfiguring it.
  • Allow per-frame calculation of PSNR (contribution from Meta).

  • Compression Efficiency Improvements

    • Variance Boost is now enabled for tuning modes AOM_TUNE_IQ and AOM_TUNE_SSIMULACRA2 at speeds 8 and 9 (2-5% SSIMULACRA 2 BD-Rate gains)
    • Several quality/time tradeoff improvements and bug fixes for all intra mode speeds 8 and 9.
      • Up to 6.9% SSIMULACRA 2 BD-Rate gains for speed 8
      • Up to 2.2% SSIMULACRA 2 BD-Rate gains for speed 9

  • Perceptual Quality Improvements

    • RTC: Visual quality improvements for screen content mode.
    • RTC: Visual quality improvements for video mode for resolutions >= 720p.

  • Speedups

    • Optimize intraBC search for better speed/efficiency tradeoffs for all intra mode speeds >= 1
    • Optimize intraBC block hashing process
    • RTC Screen: speed feature added to speed 12 for ~2x speedup on slide/scene changes, for resolutions >= 720p.
    • ML based speedup improvement on the partition pruning for speed <= 2

  • Other Improvements

    • Fixes for RPS (reference picture selection) for RTC: Based on av1_discuss issue: https://groups.google.com/a/aomedia.org/g/av1-discuss/c/sqFad980SsA

  • Bug Fixes

    • b:421196988: all intra speed 8: overuse of palette mode unnecessarily inflating file sizes
    • b:423804955: Improve quality for 4K Screencast
    • webrtc:388070060: Allow per-frame calculation of PSNR
    • b:433046392, b:432035817: Fix to SVC crash triggered with Jitsi video conference app.
    • b:419622699: Fix integer overflow in update_buffer_level
    • b:407813259: Fix to update seq_params for number of layers change
    • b:400885218: External scaling for AV1
    • b:391849810: High AV1 frame encode time on slide changes
    • b:399575647: Too aggressive QP backoff at scene changes
    • b:383306740: Quality degradation at horizontal scrolling