h264_cuvid (without hwaccel) + hwupload_cuda filter is currently broken. The 
resample_sample_fmt in the input stream is not updated after h264_cuvid decoder 
is initialized, due to this reconfiguration of the filter graph is triggered 
after the decode. During reconfiguration, Scale filter is inserted after 
hwupload_cuda filter and the filter configuration fails during format merging.

Try the following command line to observe the issue:

ffmpeg -y -c:v h264_cuvid -i amazing.264 -vf hwupload_cuda -c:v h264_nvenc 
out.264

Thanks,
Sumit

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Attachment: 0001-ffmpeg-reset-resample-format-in-the-input-stream-aft.patch
Description: 0001-ffmpeg-reset-resample-format-in-the-input-stream-aft.patch

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