ffmpeg - Titan Black 不能使用 NVENC 吗？

Question

我用 --enable-nvenc 编译了 FFMPEG 并想用 NVENC 编码器进行编码，但是在运行 ffmpeg 时出现了这个错误消息。

[nvenc_h264 @ 0x8ed020] 4 CUDA capable devices found
[nvenc_h264 @ 0x8ed020] [ GPU #0 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
[nvenc_h264 @ 0x8ed020] [ GPU #1 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
[nvenc_h264 @ 0x8ed020] [ GPU #2 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
[nvenc_h264 @ 0x8ed020] [ GPU #3 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
[nvenc_h264 @ 0x8ed020] No NVENC capable devices found

我有 Titan black gpu，正如官方文件所说，它应该得到支持。

我的 nvenc-sdk 版本是 5.0

下面列出了 nvidia-smi 信息。

~> nvidia-smi
Wed Jan  6 16:36:55 2016
+------------------------------------------------------+
| NVIDIA-SMI 352.39     Driver Version: 352.39         |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce GTX TIT...  Off  | 0000:02:00.0     Off |                  N/A |
| 54%   82C    P2   215W / 250W |   4422MiB /  6143MiB |     77%      Default |
+-------------------------------+----------------------+----------------------+
|   1  GeForce GTX TIT...  Off  | 0000:04:00.0     Off |                  N/A |
| 55%   82C    P2   160W / 250W |   5926MiB /  6143MiB |     84%      Default |
+-------------------------------+----------------------+----------------------+
|   2  GeForce GTX TIT...  Off  | 0000:83:00.0     Off |                  N/A |
| 58%   83C    P2   147W / 250W |   5926MiB /  6143MiB |     68%      Default |
+-------------------------------+----------------------+----------------------+
|   3  GeForce GTX TIT...  Off  | 0000:84:00.0     Off |                  N/A |
| 53%   83C    P2   191W / 250W |   3155MiB /  6143MiB |     85%      Default |
+-------------------------------+----------------------+----------------------+

Answer 1

由于代表率低，无法评论您的答案，但对于以后遇到此问题的任何人，我会尽力为您节省时间并告诉您您正在寻找的 ffmpeg 标志是 -pix_fmt yuv420p。

这将使整个命令类似于以下内容:
ffmpeg -f x11grab -i :0.0 -vcodec nvenc -pix_fmt yuv420p output.mp4