Bug with Multiple USB Capture Cards and Audio

E

ElleBee977

New Member
Hi New to OBS on the Mac, but used it with windows before. I've found a bug with version 30.2.3 and the audio part of capture cards

If I plug in a single capture card it works fine - video is fine, then I add an Audio input capture and I am able to choose the usb card. works fine. I want to use two capture cards, one for an XBOX with its audio, but then use a second one for just a video input from an older DSLR using its mini HDMI out into another identical capture card.

Screenshot 2024-12-06 at 5.54.49 PM.png


I then connect my second capture card (which is the same model (Guermok HDMI/USBC) and instead of enumerating another usb audio device, it adds the second one but overwrites the first one and as a result I lose the audio that was previously setup

Screenshot 2024-12-06 at 5.57.15 PM.png


I would expect to see both audio capture inputs available to me, but this is not the case.

I confirmed that this works properly on the windows version of OBS as you can see below when I use the same two capture cards plugged into my PC, both are selectable for use.

pc-obs-audio.png


please let me know if you need any more information and I can post it here -- thanks -- ~Lori
 
L

Lawrence_SoCal

Active Member
Not necessarily, and in this case most likely NOT an OBS Studio bug
1. best practice is to test at Operating System level first (especially before blaming OBS Studio)
2. This sounds like a USB device violating standards and re-using serial number... there are numerous threads (more on Windows OS side, but same USB device issue where mfg NOT properly following USB standards, and usually a non-issue until you get multiple of same device, and a program (like OBS Studio) that needs deeper/tighter integration than others.

I'm not sure, but I'd guess in your case the problem is your devices. And you need to fix at device and/or operating system level. most likely nothing OBS Studio can reasonably do about it... but just guessing
To confirm, you should be able at Operating System level (or special app/tool) to see USB device enumeration and I'd guess both devices show up as the same (which is a violation of USB standards).
 
E

ElleBee977

New Member
If it was a problem with devices and serialization, then wouldn’t it affect the windows version as well? that works just fine as you can see above, and it does not affect the video part of the capture card either. I see both of those no problem. I was able to make progress with the issue by mapping the two audio devices to auxiliary audio devices in settings/audio - because in that dialog box, both *do* actually show up. its just in this other place, they do not seem to show up. So again. I would think this points to an issue in that particular piece of code.
 
L

Lawrence_SoCal

Active Member
What you describe could easily be explained by driver issues. And different applications (and Operating Systems) may use different workarounds, that means 1 defective setup (ie duplicate device serial numbers works in 1 situation and not another). From an end-user perspective, understandable (even if wrong) to consider issue an application bug. But there can be good reasons certain vendors do/don't use certain work-arounds (vs requiring vendors to get their act together). And Windows vs MacOS defintely handle enumeration differently.
The issue is that most device vendors don't really have an issue as vast majority of folks don't get multiple of same device... so issue doesn't come up, so Mfg takes a shortcut. *IF* my guess is right, and you want to use OBS Studio, you either need to get a replacement device that doesn't duplicate the ID info (as out of spec, would be a reasonable warranty claim, but vendor may simply offer a refund as they don't have a reasonable way to fix issue), or a different (newer?) model/version/etc so duplicate isn't an issue. But, you need to confirm if duplicate USB ID info is the problem first
 
A

AaronD

Active Member
Lawrence_SoCal said:
...confirm if duplicate USB ID info is the problem first
Click to expand...
Does Mac have the lsusb command? Here's what it does on my Linux box:
Code: 
aaron@aaron-ubuntustudio-m6800:~$ lsusb
Bus 002 Device 004: ID 0a5c:5801 Broadcom Corp. BCM5880 Secure Applications Processor with fingerprint swipe sensor
Bus 002 Device 003: ID 8087:07dc Intel Corp. Bluetooth wireless interface
Bus 002 Device 002: ID 8087:8000 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 056a:4001 Wacom Co., Ltd TPC4001
Bus 001 Device 003: ID 0c45:64d0 Microdia Integrated Webcam
Bus 001 Device 002: ID 8087:8008 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 002: ID 413c:5534 Dell Computer Corp. Hub of E-Port Replicator
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 006: ID 047d:2048 Kensington Orbit Trackball with Scroll Ring
Bus 003 Device 005: ID 03f0:032a HP, Inc HP LaserJet Professional P1102w
Bus 003 Device 004: ID 05e1:0408 Syntek Semiconductor Co., Ltd STK1160 Video Capture Device
Bus 003 Device 002: ID 413c:2134 Dell Computer Corp. Hub of E-Port Replicator
Bus 003 Device 003: ID 413c:2513 Dell Computer Corp. internal USB Hub of E-Port Replicator
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
aaron@aaron-ubuntustudio-m6800:~$ lsusb -v -d 0a5c:5801

Bus 002 Device 004: ID 0a5c:5801 Broadcom Corp. BCM5880 Secure Applications Processor with fingerprint swipe sensor
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0  
  bDeviceSubClass         0  
  bDeviceProtocol         0  
  bMaxPacketSize0        64
  idVendor           0x0a5c Broadcom Corp.
  idProduct          0x5801 BCM5880 Secure Applications Processor with fingerprint swipe sensor
  bcdDevice            1.01
  iManufacturer           1 Broadcom Corp
  iProduct                2 5880
  iSerial                 3 0123456789ABCD
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x00ab
    bNumInterfaces          3
    bConfigurationValue     0
    iConfiguration          0  
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       254 Application Specific Interface
      bInterfaceSubClass      0  
      bInterfaceProtocol      0  
      iInterface              4 Broadcom USH w/swipe sensor
      ** UNRECOGNIZED:  10 25 00 00 00 00 00 00 00 00 00 00 00 00 00 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0010  1x 16 bytes
        bInterval              32
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass        11 Chip/SmartCard
      bInterfaceSubClass      0  
      bInterfaceProtocol      0  
      iInterface              5 Contacted SmartCard
      ChipCard Interface Descriptor:
        bLength                54
        bDescriptorType        33
        bcdCCID              1.00
        nMaxSlotIndex           0
        bVoltageSupport         7  5.0V 3.0V 1.8V  
        dwProtocols             3  T=0 T=1
        dwDefaultClock       4000
        dwMaxiumumClock      4000
        bNumClockSupported      0
        dwDataRate           9600 bps
        dwMaxDataRate      250000 bps
        bNumDataRatesSupp.      0
        dwMaxIFSD             247
        dwSyncProtocols  00000000  
        dwMechanical     00000000  
        dwFeatures       000102BA
          Auto configuration based on ATR
          Auto voltage selection
          Auto clock change
          Auto baud rate change
          Auto PPS made by CCID
          NAD value other than 0x00 accepted
          TPDU level exchange
        dwMaxCCIDMsgLen       271
        bClassGetResponse      00
        bClassEnvelope         00
        wlcdLayout           none
        bPINSupport             0  
        bMaxCCIDBusySlots       1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0010  1x 16 bytes
        bInterval              32
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass       254 Application Specific Interface
      bInterfaceSubClass      0  
      bInterfaceProtocol      0  
      iInterface              7 Broadcom USH
      ** UNRECOGNIZED:  10 26 00 00 00 00 00 00 00 00 00 00 00 00 00 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x87  EP 7 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0010  1x 16 bytes
        bInterval              32
Device Status:     0x0000
  (Bus Powered)
aaron@aaron-ubuntustudio-m6800:~$
The iSerial 3 0123456789ABCD line looks suspicious to me. That's the serial number. Or more accurately, it specifies that the serial number is in string #3. Requesting string #3 then returns 0123456789ABCD, which seems like the sort of thing that would be the same for all devices, in violation of the USB spec. But like Lawrence said, it's only a problem if you have multiple of the same VID:PID pair (Vendor ID, Product ID), and who's going to have multiple fingerprint readers?
 
A

AaronD

Active Member
I suppose, to satisfy the more eagle-eyed viewers, I should look at the Composite -> USB video capture, that's hooked up to a VCR:
Code: 
aaron@aaron-ubuntustudio-m6800:~$ sudo lsusb -v -d 05e1:0408
[sudo] password for aaron:  

Bus 003 Device 004: ID 05e1:0408 Syntek Semiconductor Co., Ltd STK1160 Video Capture Device
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0  
  bDeviceSubClass         0  
  bDeviceProtocol         0  
  bMaxPacketSize0        64
  idVendor           0x05e1 Syntek Semiconductor Co., Ltd
  idProduct          0x0408 STK1160 Video Capture Device
  bcdDevice            0.05
  iManufacturer           1 Syntek Semiconductor
  iProduct                2 USB 2.0 Video Capture Controller
  iSerial                 0  
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x00fb
    bNumInterfaces          3
    bConfigurationValue     1
    iConfiguration          0  
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0  
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0  
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0300  1x 768 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       2
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0  
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x03fc  1x 1020 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       3
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0  
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       4
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0  
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0c00  2x 1024 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       5
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0  
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x1400  3x 1024 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol      0  
      iInterface             11 USB Audio Interface
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength       0x0026
        bInCollection           1
        baInterfaceNr(0)        2
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             1
        wTerminalType      0x0201 Microphone
        bAssocTerminal          0
        bNrChannels             1
        wChannelConfig     0x0000
        iChannelNames           0  
        iTerminal               0  
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             2
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID               3
        iTerminal               0  
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype      6 (FEATURE_UNIT)
        bUnitID                 3
        bSourceID               1
        bControlSize            1
        bmaControls(0)       0x01
          Mute Control
        iFeature                0  
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol      0  
      iInterface             11 USB Audio Interface
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol      0  
      iInterface             11 USB Audio Interface
      AudioStreaming Interface Descriptor:
        bLength                 7
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bDelay                  1 frames
        wFormatTag         0x0002 PCM8
      AudioStreaming Interface Descriptor:
        bLength                11
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bNrChannels             1
        bSubframeSize           1
        bBitResolution          8
        bSamFreqType            1 Discrete
        tSamFreq[ 0]         8000
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0009  1x 9 bytes
        bInterval               4
        AudioStreaming Endpoint Descriptor:
          bLength                 7
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bLockDelayUnits         0 Undefined
          wLockDelay         0x0000
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0  
  bDeviceSubClass         0  
  bDeviceProtocol         0  
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0000
  (Bus Powered)
aaron@aaron-ubuntustudio-m6800:~$
For some reason, this one needed more permissions than the other, hence the sudo up front, and the password. Its serial number is blank. (string #0)
 
L

Lawrence_SoCal

Active Member
The joy First world consumers get when buying less expensive products that often work, right up until they don't...
LOTS of lazy USB implementation, well outside of standards and best practice... and they often work, so folks assume it isn't the device problem when an issue does arise ... but it often is the device (and/or its equally sloppy driver) causing the problem (or poor quality or outright wrong USB cable.. ex USB2 cable between USB3 device and port).. ugh USB is such a mess... Thunderbolt not being a lot better
 
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