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+From [@lars18th](https://github.com/keylase/nvidia-patch/issues/491)
+
+Here a simple command to check if the patching works:
+```
+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 4M -f null - \
+-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 8M -f null - \
+-vf hwupload -c:a copy -c:v h264_nvenc -b:v 6M -f null -  
+```
+
+This only requires to have installed a recent ffmpeg version compiled with nvenc enabled. Almost all distributions have it now.
+
+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.