[FFmpeg-user] 4K 60Hz Directshow Video Capture

[William Caulfield]

On Mon, Feb 12, 2018 at 7:37 AM, Alex P <alex.p at avenview.com> wrote:

> Windows 10
>
> Intel i7-8700K
>
> GTX 1050Ti
>
> 16GB DDR4
>
> SATA Samsung Evo
>
>
>
> I'm using a Yuan 4K60 capture card with the end goal of capturing the video
> in a lossless format. I need it to be lossless as the clips will be used to
> test hardware h264 encoders.
>
>
>
> Product page:
> http://www.yuan.com.tw/products/capture/4k/sc560n1_lv_hdmi2.htm
>
> Directshow is supported.
>
>
>
> Command: ffmpeg -f dshow -video_size 3840x2160 -framerate 59.9 -rtbufsize
> 2100000000 -pixel_format bgr24 -i video="MZ0380 PCI, Analog 01 Capture"
> -c:v
> libx265 -x265-params lossless=1 out1.avi
>
>
>
> I have also tried writing to null: ffmpeg -f dshow -video_size 3840x2160
> -framerate 59.9 -rtbufsize 2100000000 -pixel_format bgr24 -i video="MZ0380
> PCI, Analog 01 Capture" -c:v libx265 -x265-params lossless=1 -f null -
>
>
>
> I get the same error (see attatched) and I have to force quit by pressing
> Ctrl-C a bunch. Error also occurs if I write to a RAM disk.
>
>
>
> [dshow @ 000001dda20ca3a0] real-time buffer [MZ0380 PCI, Analog 01 Capture]
> [video input] too full or near too full (63% of size: 2100000000 [rtbufsize
> parameter])! frame dropped!
>
>
>
> Any help would be appreciated. 1080p capture right to rawvideo is perfect.
> I
> would like to use NVENC in lossless mode if anyone has experience with
> that.
>
>
>
>

 haven't used Windows / Directshow for a few years, but back in the day I
would have attempted this using VirtualDub and HuffYUV. I believe that
HuffYUV is available for ffmpeg, but can't say that I've ever tried it.




-- 

*William Caulfield *| *ContentBridge Systems*