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Verify NVENC patch
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Jai Luthra edited this page Dec 11, 2025
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Linux
Run the patch tester script:
tools/patch-tester/patch-tester.sh
Or alternatively directly run the following ffmpeg command:
ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda \
-f lavfi -i testsrc -t 50 \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 1M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 2M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 3M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 4M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 5M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 6M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 7M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 8M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 9M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 10M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 11M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 12M -f null - \
-vf hwupload -c:a copy -c:v h264_nvenc -b:v 13M -f null -
This only requires to have installed a recent ffmpeg version compiled with nvenc enabled. Almost all distributions have it now.
Windows
Download FFmpeg from: https://www.gyan.dev/ffmpeg/builds/ffmpeg-git-full.7z
Then run the patch tester BAT or PowerShell script found in the win/tools/patch-tester directory.
Or alternatively manually run the following command:
ffmpeg.exe -y -hwaccel cuda -hwaccel_output_format cuda ^
-f lavfi -i testsrc -t 50 ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 1M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 2M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 3M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 4M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 5M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 6M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 7M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 8M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 9M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 10M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 11M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 12M -f null - ^
-vf hwupload -fps_mode passthrough -c:a copy -c:v h264_nvenc -b:v 13M -f null -
Output
If you get a message like:
[h264_nvenc @ 0x55fc31535fc0] OpenEncodeSessionEx failed: out of memory (10): (no details)
Error initializing output stream 3:0 -- Error while opening encoder for output stream #3:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!
Then the patch has failed.
But if the ffmpeg starts to work and shows:
frame= 560 fps=329 q=8.0 Lq=8.0 q=8.0 q=8.0 size=N/A time=00:00:22.40 bitrate=N/A speed=13.2x
Then... Congratulations! The patch works.