处理/C920 Logitech捕获帧率视频演讲 [英] Processing / C920 logitech capture frame rate video discourse

问题描述

我正在使用Processing 2.0b进行开发，并且我刚刚购买了C920罗技Webam，以获得良好的捕获质量.

I'm developing on Processing 2.0b, and i just bought a C920 logitech webam for a good capture quality.

然后我尝试以1920 x 1080捕获，问题是我的速度低于每秒15 fps. 当我列出所有可捕获的设备时，程序将写:

Then I try to capture at 1920 x 1080, the problem is that I'm under 15 fps per seconds.. When I list all the devices availsable to capture, the program write:

某些大小和fps

Some size and fps

...

-[61]名称= HD Pro网络摄像头C920，尺寸= 1024x576，fps = 5"

-[61] "name=HD Pro Webcam C920,size=1024x576,fps=5"

-[62]名称= HD Pro网络摄像头C920，尺寸= 1024x576，fps = 30"

-[62] "name=HD Pro Webcam C920,size=1024x576,fps=30"

-[63]名称= HD Pro网络摄像头C920，尺寸= 1280x720，fps = 5"

-[63] "name=HD Pro Webcam C920,size=1280x720,fps=5"

-[64]名称= HD Pro网络摄像头C920，尺寸= 1280x720，fps = 30"

-[64] "name=HD Pro Webcam C920,size=1280x720,fps=30"

-[65]名称= HD Pro网络摄像头C920，尺寸= 1600x896，fps = 5"

-[65] "name=HD Pro Webcam C920,size=1600x896,fps=5"

-[66]名称= HD Pro网络摄像头C920，尺寸= 1600x896，fps = 30"

-[66] "name=HD Pro Webcam C920,size=1600x896,fps=30"

-[67]名称= HD Pro网络摄像头C920，尺寸= 1920x1080，fps = 5"

-[67] "name=HD Pro Webcam C920,size=1920x1080,fps=5"

-[68]名称= HD Pro网络摄像头C920，尺寸= 1920x1080，fps = 30"

-[68] "name=HD Pro Webcam C920,size=1920x1080,fps=30"

...

其他尺寸和fps ...

some others size and fps...

所以，据我所读..对于1920 x 1080大小，可以使用30 fps的帧率.

So, as I can read.. for the size 1920 x 1080 the framerate of 30 fps is available..

怎么了?

即使我强制程序或以30 fps的速度运行..在cam.start();上也会出现崩溃，告诉我该大小的帧速率不可用...

Even if I force the program or run at 30 fps.. theres a crash pointing on cam.start(); telling me that the framerate for this size isn't available...

有什么帮助...吗?

推荐答案

几个月前，我也遇到了这个问题.这是我在论坛中搜索并联系客户支持后发现的:

I ran into this problem a few months back as well. Here's what I found, searching through forums and contacting customer support:

Logitech C920仅在直接支持H.264的应用程序中以1080p提供30fps，并且可以直接从摄像机提取H.264流. C920可以进行板载H.264压缩，但是大多数应用程序不支持直接从摄像机提取压缩后的数据流.相反，他们必须解压缩然后重新压缩流，从而降低帧速率.

The Logitech C920 only provides 30fps at 1080p with applications that supports H.264 directly, and can pull in the H.264 stream directly from the camera. The C920 does on-board H.264 compression, but most applications don't support pulling the compressed stream straight from the camera; instead, they have to decompress then re-compress the stream, dropping the framerate.

Skype直接从摄像机支持H.264，因此使用Skype，您应该能够获得1920x1080 @ 30fps，但是处理时您将看不到如此高的帧率.另外，我认为您必须使用Windows才能使用Logitech驱动程序来支持此功能.

Skype supports H.264 straight from the camera, so with Skype you should be able to get 1920x1080 @ 30fps, but you won't see this high framerate with Processing. Also, I think you have to use Windows to use the Logitech drivers to support this.

如果可以找到，我会发布我做过一段时间的研究，但是不幸的是，答案是您必须降低分辨率或帧率.

I'll post the research I did a while back if I can find it, but unfortunately the answer is that you'll have to drop either your resolution or your framerate.

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