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FR3141
n00b
Joined: 13 Jan 2018
Posts: 39
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 Posted: Sat May 26, 2018 11:27 pm Post subject: Nvidia Nvenc Fails |
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I am using the proprietary Nvidia drivers with a GT 730 based video card. The GT 730 has both vdpau and nvenc capabilities.
However, whenever I use ffmpeg to try any kind of recording or transcoding with the h264_nvenc codec, I get the following error:
[h264_nvenc @ 0xdd9aa0] Loaded Nvenc version 8.1
[h264_nvenc @ 0xdd9aa0] Nvenc initialized successfully
[h264_nvenc @ 0xdd9aa0] Cannot init CUDA
[h264_nvenc @ 0xdd9aa0] Nvenc unloaded
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0
What is the problem here or how can I debug this further?
My nvidia-drivers does have the CUDA libraries:
/usr/lib64/libcuda.so -> libcuda.so.396.24
/usr/lib64/libcuda.so.1 -> libcuda.so.396.24
Has anyone experienced this problem? An Internet search produces very few reports. |
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FR3141
n00b
Joined: 13 Jan 2018
Posts: 39
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| Posted: Mon May 28, 2018 3:23 pm Post subject: |
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I just want to add some more debugging information. Using the strace utility I get the following output:
| Code: | stat("/dev/nvidia-uvm", {st_mode=S_IFCHR|0666, st_rdev=makedev(249, 0), ...}) = 0
stat("/dev/nvidia-uvm-tools", {st_mode=S_IFCHR|0666, st_rdev=makedev(249, 1), ...}) = 0
openat(AT_FDCWD, "/dev/nvidia-uvm", O_RDWR|O_CLOEXEC) = -1 EIO (Input/output error)
openat(AT_FDCWD, "/dev/nvidia-uvm", O_RDWR) = -1 EIO (Input/output error)
ioctl(-5, _IOC(0, 0x00, 0x01, 0x3000), 0x7ffe40bf25c0) = -1 EBADF (Bad file descriptor)
ioctl(-5, _IOC(0, 0x00, 0x02, 0x3000), 0) = -1 EBADF (Bad file descriptor)
close(-5) = -1 EBADF (Bad file descriptor)
write(2, "\33[48;5;0m\33[38;5;51m[h264_nvenc @"..., 48[h264_nvenc @ 0x2411c00] ) = 48
write(2, "\33[48;5;0m\33[38;5;196mCannot init "..., 41Cannot init CUDA
) = 41
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Apparently. ffmpeg tries to open the "/dev/nvidia-uvm" file, which is the device node for CUDA, but receives an error. After this the program exits with the "Cannot init CUDA" message.
I am not sure, but it would seem that the nvidia proprietary module is responsible for the input output error.
Could someone try to invoke nvenc with a suitable Nvidia card and report the results? One possible command for a screen capture is this:
ffmpeg -f x11grab -r 15 -s 640x480 -i :0.0+0,0 -vcodec h264_nvenc -preset default -pix_fmt yuv420p video.avi
Ffmpeg has to be emerged with "USE-nvenc"
[Moderator edit: added [code] tags to preserve output layout. -Hu] |
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