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4 votes
Accepted

How to extract a video frame using NVIDIA card

Since the video bitstream is being decoded on the GPU, CUDA upload isn't required. Command with format conversion is ffmpeg -hwaccel cuvid -c:v h264_cuvid -resize 1024x70 -i video_source \ -...
Gyan's user avatar
  • 33.3k
4 votes

FFMPEG: hardware acceleration for libvpx

Libvpx has no hardware encoding or acceleration support of any kind, it's purely a software implementation. There are some VP9 hardware encoders out there but they're few in number and neither Nvidia ...
veikk0's user avatar
  • 164
3 votes

FFmpeg hardware cuda decoding and overlay picture

For 1st question - Most likely you're looking at not applicable error (the default yuv420p is not usable here - you may also need to get newer ffmpeg) - while using the hwdownload you need to tell ...
Pavel Frkal's user avatar
3 votes

Configure CQP (CRF) for h264_nvenc

CRF != CQP. The former may have variable QP but tries to maintain quality. CQP is a cruder form of rate-control. For nvenc, use -rc vbr_hq -qmin 0 and add -cq X where X sets a quality level; range is ...
Gyan's user avatar
  • 33.3k
2 votes
Accepted

FFmpeg mosaic with hardware acceleration on Quadro P4000

Regarding, Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_hwupload_cuda_17 in [tmp3][lowerright] overlay=shortest=1:x=720:y=480;hwupload_cuda you have to replace the ; ...
Gyan's user avatar
  • 33.3k
2 votes
Accepted

Improve performance on 4 x 4K mosaic with FFmpeg

The problem was about the overlay filter which is too slow. I've changed for a combination of hstack and vstack as you can see here : ffmpeg \ -hwaccel cuvid -c:v h264_cuvid -i ...
c.censier's user avatar
  • 163
2 votes

Configure CQP (CRF) for h264_nvenc

from reading: ffmpeg -h encoder=h264_nvenc and the nvidia nvenc examples at (https://devblogs.nvidia.com/nvidia-ffmpeg-transcoding-guide/), I've arrived at: ffmpeg -vsync 0 -hwaccel cuvid -c:v ...
jjisnow's user avatar
  • 121
1 vote
Accepted

FFmpeg/nvenc(cuda): Where is the documentation for h264_nvenc encoder?

You may check https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/nvenc.h#L186-L221 and the valid can be referenced from https://github.com/FFmpeg/nv-codec-headers/blob/master/include/ffnvcodec/...
xer-rex's user avatar
  • 817
1 vote
Accepted

After Effects CS6 not recognizing GTX 1050 Ti GPU

Updating the Optix.dll to Optix.1.dll version 3.9.1 worked.
Ajith's user avatar
  • 111
1 vote

Configure CQP (CRF) for h264_nvenc

If you don't specify bit rate yourself, FFmpeg will assume a default bit rate of 256 kbit\s, you have to unset it with -b:v 0.
Awa's user avatar
  • 11
1 vote

How to extract a video frame using NVIDIA card

Actually we can extract a video frame using only NVIDIA card via thumbnail_cuda filter. For it is necessary to configure FFmpeg with: --enable-cuda-sdk --enable-filter=scale_cuda --enable-filter=...
Ivan Kolesnikov's user avatar
1 vote
Accepted

Using multiple graphics cards in Davinci Resolve

The free version of Resolve doesn't support multiple GPUs. The Studio (paid) version does. However, combining multiple GPU cards generally doesn't increase VRAM (i.e., if you only have 4GB per card, ...
Michael Tiemann's user avatar

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