[FFmpeg-user] Input Buffer ovverun with Decklink 8K Pro and Nvenc

jroch jroch at b-stream.com
Wed Aug 5 20:10:00 EEST 2020


I'm trying to encode a live 8K footage from a decklink 8k p ro card using
nvenc hevc codec but i get  Decklink input buffer overrun! always. I have
tested outputting to -f null /dev/null but i get the same
I tried with the -thread_queue_size option too without luck.
My 2 pci ports are 16X each on a 32 lines pci express 3.0 mother board. 

My test command :

ffmpeg -thread_queue_size 5096 -f decklink -r 30000/1001 -rtbufsize 200M -i
'SDI1' -vsync 1 -c:a aac -b:a 128k -c:v hevc_nvenc -b:v 50M -preset fast
-profile main -level auto -f null /dev/null

Any ideas on how to troubleshoot this ?

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