r/AV1 is available on https://lemmy.world/c/av1 due to changes in Reddit policies.
You can read more about it [here](https://archive.is/6IeXF).
*I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AV1) if you have any questions or concerns.*
As always, you can download \`ffmpeg\` builds with svt-av1 included on it's CI server:
Linux:
[https://gitlab.com/AOMediaCodec/SVT-AV1/-/jobs/6884418603/artifacts/browse](https://gitlab.com/AOMediaCodec/SVT-AV1/-/jobs/6884418603/artifacts/browse)
Windows:
[https://gitlab.com/AOMediaCodec/SVT-AV1/-/jobs/6884418456/artifacts/browse](https://gitlab.com/AOMediaCodec/SVT-AV1/-/jobs/6884418456/artifacts/browse)
https://gitlab.com/AOMediaCodec/SVT-AV1/-/blob/master/Docs/Appendix-Variance-Boost.md
> This option controls how many superblocks are boosted. It determines this based on the internal low-contrast/high-contrast ratio in each superblock. A value of 1 means only 1/8 of the superblock needs to be low-contrast to boost it, while a value of 8 requires the entire superblock to be low-contrast for a boost to be applied.
Lower octile values are less efficient (more high contrast areas are boosted alongside low contrast areas, which inflates bitrate), while higher values are less visually consistent (fewer low contrast areas are boosted, which can create low quality area "holes" within superblocks).
The default value is 6. Recommended values are between 4 and 7.
well yea, the setting to help is to increase the octile lol. that's just the nature of low octile as described in the above post. it's inefficient and not recommended for most cases.
VB is very new and looks extremely promising in fixing some of the biggest weaknesses i've noticed with av1, but at the moment the filesize cost is far too much to be worth it imo. i am seeing a 50% increase in file size with 1080p files. i am hopeful that these issues with VB will be improved as it matures.
> higher values are less visually consistent
> which can create low quality area "holes" within superblocks
Lower octiles boost bit rates more evenly throughout the frame. Higher octiles are more picky about what needs to be boosted.
This causes blocks that are low quality and high quality to be adjacent with a very sharp cut off. Lower octiles are less efficient but the quality gap between adjacent blocks is smaller, which leads to a smoother image without as much blocking as the higher octiles.
They probably need to implement a function that increases bit rates around boosted blocks to ease the flow and reach smoother gradients. Would lower the efficiency a bit but lead to a significant improvement on perceptual quality.
i don't know enough about qcomp to tell you how exactly it's different, but yes it is
highly recommend reading through [this thread](https://gitlab.com/AOMediaCodec/SVT-AV1/-/blob/master/Docs/Appendix-Variance-Boost.md)
r/AV1 is available on https://lemmy.world/c/av1 due to changes in Reddit policies. You can read more about it [here](https://archive.is/6IeXF). *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AV1) if you have any questions or concerns.*
Wow, that was relatively soon after the 2.0 release. Nifty.
As with many projects, guess they were developing versions in tandem.
As always, you can download \`ffmpeg\` builds with svt-av1 included on it's CI server: Linux: [https://gitlab.com/AOMediaCodec/SVT-AV1/-/jobs/6884418603/artifacts/browse](https://gitlab.com/AOMediaCodec/SVT-AV1/-/jobs/6884418603/artifacts/browse) Windows: [https://gitlab.com/AOMediaCodec/SVT-AV1/-/jobs/6884418456/artifacts/browse](https://gitlab.com/AOMediaCodec/SVT-AV1/-/jobs/6884418456/artifacts/browse)
> you can download `ffmpeg` builds with svt-av1 included on it's CI server TIL!! Thank you.
Variance Boost looks very promising but very blocky even at lower octiles. Any settings that can help with that?
https://gitlab.com/AOMediaCodec/SVT-AV1/-/blob/master/Docs/Appendix-Variance-Boost.md > This option controls how many superblocks are boosted. It determines this based on the internal low-contrast/high-contrast ratio in each superblock. A value of 1 means only 1/8 of the superblock needs to be low-contrast to boost it, while a value of 8 requires the entire superblock to be low-contrast for a boost to be applied. Lower octile values are less efficient (more high contrast areas are boosted alongside low contrast areas, which inflates bitrate), while higher values are less visually consistent (fewer low contrast areas are boosted, which can create low quality area "holes" within superblocks). The default value is 6. Recommended values are between 4 and 7. well yea, the setting to help is to increase the octile lol. that's just the nature of low octile as described in the above post. it's inefficient and not recommended for most cases. VB is very new and looks extremely promising in fixing some of the biggest weaknesses i've noticed with av1, but at the moment the filesize cost is far too much to be worth it imo. i am seeing a 50% increase in file size with 1080p files. i am hopeful that these issues with VB will be improved as it matures.
> higher values are less visually consistent > which can create low quality area "holes" within superblocks Lower octiles boost bit rates more evenly throughout the frame. Higher octiles are more picky about what needs to be boosted. This causes blocks that are low quality and high quality to be adjacent with a very sharp cut off. Lower octiles are less efficient but the quality gap between adjacent blocks is smaller, which leads to a smoother image without as much blocking as the higher octiles. They probably need to implement a function that increases bit rates around boosted blocks to ease the flow and reach smoother gradients. Would lower the efficiency a bit but lead to a significant improvement on perceptual quality.
is variance boost different from qcomp?
i don't know enough about qcomp to tell you how exactly it's different, but yes it is highly recommend reading through [this thread](https://gitlab.com/AOMediaCodec/SVT-AV1/-/blob/master/Docs/Appendix-Variance-Boost.md)