[FFmpeg-user] Encoding 4K 60Hz lossless from a capture card

Alex Pizzi alex.p at avenview.com
Wed Dec 13 04:39:05 EET 2017

Windows 10 64-bit
Ryzen 7
GTX 1080

Hi all,

I'm trying to encode 4K 30/60Hz video in a lossless format from a 4K
capture card and everything I've tried gives me a similar error as in the
linked image, [real-time buffer too full or near too full frame dropped]


This is the command I've tried most recently:

ffmpeg.exe -f dshow -video_size 3840x2160 -framerate 30 -pixel_format bgr24
-rtbufsize INT_MAX -i video="MZ0380 PCI, Analog 01 Capture" -vf fps=30

With the images dumped to a 10G RAM disk or 850 EVO. I'm doing this to skip
the encoding step.

I get the same error when encoding with h265 lossless and NVENC h265

I need the video to be lossless as it will be used to test hardware h265

Video source is a 4K Blu-ray.

Any help would be greatly appreciated. Thank you.

-Alex P

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