[FFmpeg-user] Ffmpeg Nvenc GPU decode still use much more cpu resource

unicor unicorok at 163.com
Tue Dec 25 20:21:27 EET 2018

The command is:
ffmpeg -hwaccel_device 1 -hwaccel cuvid -c:v h264_cuvid -y -i a.mkv -b:v 768k -r 25 -acodec libfdk_acc -ac 2 -b:a 96k -ar 44100 -vf ‘scale_npp=854:480,hwdownload,format=nv12’ -c:v h264_nvenc b.mp4
The error is:
Bit depth 10 is not supported.
The video probe information:

> 在 2018年12月26日,00:36,Carl Zwanzig <cpz at tuunq.com> 写道:
> Hello,
>> On 12/25/2018 8:09 AM, dd wrote:
>> We replace cpu with gpu to ffmpeg recently, met a performance problem.
>> As the following problem Code:
>> ffmpeg -hwaccel_device 2 -hwaccel cuvid -i a.mp4 -vf “scale=1080:720,overlay=()” -gpu 2  -c:v h264_nvenc out.mp4
>> it use much more cpu resource, but a little gpu, it is not we want. see the attachment picture.
> You need to make sure you're using a current, or at least recent, version of ffmpeg and also to post the entire command output from the command you use.
> Later,
> z!
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