FFMpeg 在 OSX Mojave 上访问 AVFoundation usb 子设备相机

Question

我有一个用于 VR 的双 USB 摄像头：两个摄像头，一个 USB 接口。在 linux 上，它出现在 /dev/video0 和 /dev/video1 中，我可以使用 ffmpeg -i /dev/video0

进行捕获

在 Mojave 上，我可以在 USB 集线器中看到两个设备：

USB 2.0 Hub:

Product ID: 0x0101
Vendor ID:  0x1a40  (TERMINUS TECHNOLOGY INC.)
Version:    1.11
Speed:  Up to 480Mb/sec
Location ID:    0x14200000 / 8
Current Available (mA): 500
Current Required (mA):  100
Extra Operating Current (mA):   0

    Stereo Vision 2:

    Product ID: 0x9901
    Vendor ID:  0x0ac8  (Z-Star Microelectronics Corporation)
    Version:    27.02
    Serial Number:  SN0099
    Speed:  Up to 480Mb/sec
    Manufacturer:   SHENZHEN RERVISION TECHNOLOGY
    Location ID:    0x14220000 / 10
    Current Available (mA): 500
    Current Required (mA):  500
    Extra Operating Current (mA):   0

    Stereo Vision 2:

    Product ID: 0x9902
    Vendor ID:  0x0ac8  (Z-Star Microelectronics Corporation)
    Version:    27.02
    Serial Number:  SN0100
    Speed:  Up to 480Mb/sec
    Manufacturer:   SHENZHEN RERVISION TECHNOLOGY
    Location ID:    0x14210000 / 9
    Current Available (mA): 500
    Current Required (mA):  500
    Extra Operating Current (mA):   0

但是当我列出设备时，我只能看到一个 [0]:

ffmpeg -f avfoundation -list_devices true -i ""
    [AVFoundation input device @ 0x7fae5b501a80] AVFoundation video devices:
    [AVFoundation input device @ 0x7fae5b501a80] [0] Stereo Vision 2
    [AVFoundation input device @ 0x7fae5b501a80] [1] FaceTime HD Camera
    [AVFoundation input device @ 0x7fae5b501a80] [2] Capture screen 0

从该设备捕获从其中一个摄像头捕获。

如何让 ffmpeg 也检测到第二个 USB 设备？

Answer 1

一年后我重温了这篇文章。 ffmpeg 的更新导致两个设备都可以正常看到。

==> Upgrading 1 outdated package: 
ffmpeg 4.1.4_2 -> 4.3.1

..

ffmpeg -f avfoundation -list_devices true -i "" 

[AVFoundation indev @ 0x7f85b2e00380] AVFoundation video devices:
[AVFoundation indev @ 0x7f85b2e00380] [0] Stereo Vision 2 #2
[AVFoundation indev @ 0x7f85b2e00380] [1] Stereo Vision 2
[AVFoundation indev @ 0x7f85b2e00380] [2] FaceTime HD Camera
[AVFoundation indev @ 0x7f85b2e00380] [3] Capture screen 0

FFMpeg 在 OSX Mojave 上访问 AVFoundation usb 子设备相机

FFMpeg access AVFoundation usb subdevice camera on OSX Mojave

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