SVT-AV1 Crash at 8K

[Nevril]

I want to upscale a few videos I have to 8K resolution starting from 4K.
Input Height 1600 to 2160 -> Output 2X.

I have no issues encoding using x265, and I have no issues encoding with SVT-AV1 up to Speed Preset 5.

If I choose Speed Preset 4 or lower the encoding crashes.

I also tried with a 1080 source and had no issues bringing it to 3240 but then crashed again when trying 3600 or 4096.

Seems resolution related.

Side question: is there a way to see which version of SVT-AV1 encoder Hybrid is using? I'm assuming 3.0+, but just for curiosity.

[Selur]

is there a way to see which version of SVT-AV1 encoder Hybrid is using?

No, it's not visivile inside Hybrid atm.

Hybrid\64bit>SvtAv1EncApp.exe --version
SVT-AV1 v3.1.0-rc1-3-gcc569c1 (release)

I can reproduce the crash with speed < 5, I will look into it.


Cu Selur

[Selur]

Using a 'simple' call:

ffmpeg -y -loglevel fatal -noautorotate -nostdin -threads 8 -ignore_editlist true -i "G:\TestClips&Co\files\MPEG-4 H.264\4k\4k_sample_4096x2160.mp4" -map 0:0 -an -sn -vf scale=8192:4320 -pix_fmt yuv420p10le -strict -1 -fps_mode passthrough  -sws_flags spline -f yuv4mpegpipe - | SvtAv1EncApp --input stdin  --width 8192 --height 4320 --fps-num 25 --fps-denom 1 --input-depth 10 --profile 0 --tile-rows 0 --tile-columns 0 --progress 2 --rc 0 --crf 35 --mbr 0 --aq-mode 2 --preset 4  --matrix-coefficients 9 --color-range 0 --output "J:\tmp\2025-08-01@16_38_20_9110\2025-08-01@16_38_20_9110_01.av1"

I get:

Svt[info]: -------------------------------------------
Svt[info]: SVT [version]:       SVT-AV1 Encoder Lib v3.1.0-rc1-3-gcc569c1
Svt[info]: SVT [build]  :       GCC 15.1.0       64 bit
Svt[info]: LIB Build date: Jul 27 2025 10:37:43
Svt[info]: -------------------------------------------
Svt[error]: Instance 1: 8k+ resolution support is limited to M5 and faster presets.
Svt[warn]: Instance 1: 8K and higher resolution support is currently a work-in-progress project, and is only available for demos, experimentation, and further development uses and should not be used for benchmarking until fully implemented.

=> I'll add a check for it to Hybrid to warn the user, but atm. there is nothing I can do to really fix it, since it's not a bug in Hybrid.

Cu Selur

[Nevril]

Thanks!
I didn't know about the limitation. Interesting.
I guess I'll keep x265 for the time being.

[Selur]

Uploaded a new dev version which:
a. throws '8K and higher resolution support is a work-in-progress project in SVT-AV1 and currently not available.' when width*height > 21012480. (see: svt-av1 source code)
b. includes SVT-AV1 version info under "Config->Tools->Tool Versions"

Cu Selur