The issue has been fixed (already in the previous alpha).
And, finally: Iris is included in the benchmark
BUT:
As with the previous alpha versions in this Beta the Iris model goes havoc on the actual Beta of MacOS 14.0 Sonoma, creating crazy moiree like artifacts:
On macOS (Iâm using Apple Silicon), the tool tip for âDynamic Compression Levelâ shows up when it shouldnât when hovering your mouse over the gap under the âTarget bitrateâ section of the export settings.
This shows up when selecting either the H264, H265, or VP9 encoder options.
This same âissueâ impacts Windows (tested with a Nvidia GPU) when the VP9 and AV1 encoders are selected.
TVAI always used a constant bitrate from version 3.0 up until this release. So to match older versions you need to set your export settings to: Bitrate -> Constant Target bitrate -> The setting you picked in older versions
In which case, the settings you should pick would be: Bitrate -> Constant Target bitrate -> Auto
Sadly it seems this option has been removed from all the devices that now support a dynamic bitrate mode. Maybe an unintentional change?
For reference, in older versions of TVAI, if you select âAutoâ TVAI will pick a bitrate that it thought would work for your settings, then just export in âconstant bitrate modeâ with the selected bitrate.
H264 and H265 on macOS (Using Apple Silicon) doesnât have this option for me. Is this an oversight or intentional and just missed off the release notes?
hevc_videotoolbox (and probably h264_videotoolbox) do support a âconstant quantizationâ or âconstant qualityâ mode.
The -q:v is the âconstant quantizationâ or âconstant qualityâ activator. And it operates in reverse compared to most other modes like this. The range of values you can use are 0-100. 100 is the highest quality, 0 is the lowest quality (or auto? If itâs auto, then 1 is the lowest quality).
av1_nvenc also supports a âconstant quantizeâ or âconstant qualityâ mode, same for VP9. Can we expect the encoders with missing dynamic bitrate options, but with support for that feature, to get them by the final release of this version?
@20rushtonj The new dynamic bitrate settings are using the CQP quality control options available on NVIDIA and AMD GPUs. The dynamic medium setting should create the closest result to the previous auto mode, which uses â-b:v 0â to set a variable bitrate automatically.
The three dynamic modes were tested using VMAF to create different options for balancing file size and video quality.
Here is the average VMAF score for each setting in the current Beta:
Iris is totally broken with MacOS Sonoma Beta.
It gives a totally blurred picture with moire; about the only detail left comes from the Recover original details.
Weâre rolling this out to NVIDIA and AMD GPUs on Windows for now, but we plan to add Intel and Apple Silicon options as soon as possible after next weekâs initial release.
AV1 and VP9 will definitely also be updated to use CQ rate control.
For this first beta release weâre hoping to get some feedback that will help fine tune the three levels of quality offered in this mode.
Right now the High setting is producing files that are significantly larger than the Medium setting, so we could look into targeting 95 for the High setting. Thanks for trying it out!
This Beta version is noticeably slower than the previous alpha version with Proteus 2x model on AMD. Iâm using this setting quite often and this performance regression is quite significant.
