Capture.list() showing duplicate cameras

danielcorbani · September 16, 2025, 3:05pm

Hi everyone!

I wonder if anyone could help me understand this issue with hte Video Library in Processing. When I want to select a camera to be used, I call Capture.list() to see all connected cameras, but sometimes it gives duplicate results. For example, I have only two cameras connected, one is the laptop built-in HD User Facing, and the other is a regular USB CAMERA. But printing the content of Capture.list() gives:

0: USB CAMERA #1
1: HD User Facing #1
2: USB CAMERA #2
3: HD User Facing #2

Is it supposed to happen? How should I deal with that? Just consider the last two?

glv · September 16, 2025, 4:36pm

Hello @danielcorbani,

I have always seen this.
Consider the first one or the duplicate… it makes no difference here for me.

:)

moon · September 16, 2025, 5:24pm

Hi @danielcorbani,

Thanks for pointing this out. I think this might have something to do with this issue here:

github.com/processing/processing-video

Capture.list() with video library 2.0 does not enumerate all camera configuration of each camera, just the unique camera names

opened 11:53AM - 13 Feb 21 UTC

aanestis

Capture.list() with video library 2.0 does not enumerate all camera configuratio…ns of each camera, just the unique camera names. That means that it is not possible to search for a specific configuration and then initialize the camera using the constructor Capture(parent, requestConfig). That was possible with the Video 1.0.1 library list() method and is still described in the video tutorial (https://www.processing.org/tutorials/video/)). I have reverted to the previous version for now, but is this going to be the behavior from now on?

I’m not 100% certain and need to dig into it. But the duplicate entries are likely a result of the processing-video implementation not showing all of the configuration options for a particular device. It’s reducing it down to just the device name.

I’m learning the ins and outs of the processing code base, including the libraries. Hope I can make time to address this soon, but certainly could use help if someone is interested in exploring a solution. And if that someone is nervous, I would be more than happy to talk them through it

Thank you!

Moon

glv · September 16, 2025, 6:05pm

I sometimes pop into Processing 2.2.1 for details about my cam (185 choices):

Camera List < Click to expand!

[0] "name=Logitech QuickCam Pro 9000,size=640x480,fps=5"
[1] "name=Logitech QuickCam Pro 9000,size=640x480,fps=30"
[2] "name=Logitech QuickCam Pro 9000,size=160x90,fps=5"
[3] "name=Logitech QuickCam Pro 9000,size=160x90,fps=30"
[4] "name=Logitech QuickCam Pro 9000,size=160x100,fps=5"
[5] "name=Logitech QuickCam Pro 9000,size=160x100,fps=30"
[6] "name=Logitech QuickCam Pro 9000,size=160x120,fps=5"
[7] "name=Logitech QuickCam Pro 9000,size=160x120,fps=30"
[8] "name=Logitech QuickCam Pro 9000,size=176x144,fps=5"
[9] "name=Logitech QuickCam Pro 9000,size=176x144,fps=30"
[10] "name=Logitech QuickCam Pro 9000,size=320x180,fps=5"
[11] "name=Logitech QuickCam Pro 9000,size=320x180,fps=30"
[12] "name=Logitech QuickCam Pro 9000,size=320x200,fps=5"
[13] "name=Logitech QuickCam Pro 9000,size=320x200,fps=30"
[14] "name=Logitech QuickCam Pro 9000,size=320x240,fps=5"
[15] "name=Logitech QuickCam Pro 9000,size=320x240,fps=30"
[16] "name=Logitech QuickCam Pro 9000,size=352x288,fps=5"
[17] "name=Logitech QuickCam Pro 9000,size=352x288,fps=30"
[18] "name=Logitech QuickCam Pro 9000,size=640x360,fps=5"
[19] "name=Logitech QuickCam Pro 9000,size=640x360,fps=30"
[20] "name=Logitech QuickCam Pro 9000,size=640x400,fps=5"
[21] "name=Logitech QuickCam Pro 9000,size=640x400,fps=30"
[22] "name=Logitech QuickCam Pro 9000,size=864x480,fps=5"
[23] "name=Logitech QuickCam Pro 9000,size=864x480,fps=15"
[24] "name=Logitech QuickCam Pro 9000,size=768x480,fps=5"
[25] "name=Logitech QuickCam Pro 9000,size=768x480,fps=15"
[26] "name=Logitech QuickCam Pro 9000,size=800x450,fps=5"
[27] "name=Logitech QuickCam Pro 9000,size=800x450,fps=15"
[28] "name=Logitech QuickCam Pro 9000,size=800x500,fps=5"
[29] "name=Logitech QuickCam Pro 9000,size=800x500,fps=15"
[30] "name=Logitech QuickCam Pro 9000,size=800x600,fps=5"
[31] "name=Logitech QuickCam Pro 9000,size=800x600,fps=15"
[32] "name=Logitech QuickCam Pro 9000,size=960x720,fps=5"
[33] "name=Logitech QuickCam Pro 9000,size=960x720,fps=15"
[34] "name=Logitech QuickCam Pro 9000,size=1280x720,fps=5"
[35] "name=Logitech QuickCam Pro 9000,size=1280x800,fps=5"
[36] "name=Logitech QuickCam Pro 9000,size=1280x1024,fps=5"
[37] "name=Logitech QuickCam Pro 9000,size=1600x900,fps=5"
[38] "name=Logitech QuickCam Pro 9000,size=1600x1000,fps=5"
[39] "name=Logitech QuickCam Pro 9000,size=1600x1200,fps=5"
[40] "name=Logitech QuickCam Pro 9000,size=640x480,fps=5"
[41] "name=Logitech QuickCam Pro 9000,size=640x480,fps=30"
[42] "name=Logitech QuickCam Pro 9000,size=160x90,fps=5"
[43] "name=Logitech QuickCam Pro 9000,size=160x90,fps=30"
[44] "name=Logitech QuickCam Pro 9000,size=160x100,fps=5"
[45] "name=Logitech QuickCam Pro 9000,size=160x100,fps=30"
[46] "name=Logitech QuickCam Pro 9000,size=160x120,fps=5"
[47] "name=Logitech QuickCam Pro 9000,size=160x120,fps=30"
[48] "name=Logitech QuickCam Pro 9000,size=176x144,fps=5"
[49] "name=Logitech QuickCam Pro 9000,size=176x144,fps=30"
[50] "name=Logitech QuickCam Pro 9000,size=320x180,fps=5"
[51] "name=Logitech QuickCam Pro 9000,size=320x180,fps=30"
[52] "name=Logitech QuickCam Pro 9000,size=320x200,fps=5"
[53] "name=Logitech QuickCam Pro 9000,size=320x200,fps=30"
[54] "name=Logitech QuickCam Pro 9000,size=320x240,fps=5"
[55] "name=Logitech QuickCam Pro 9000,size=320x240,fps=30"
[56] "name=Logitech QuickCam Pro 9000,size=352x288,fps=5"
[57] "name=Logitech QuickCam Pro 9000,size=352x288,fps=30"
[58] "name=Logitech QuickCam Pro 9000,size=640x360,fps=5"
[59] "name=Logitech QuickCam Pro 9000,size=640x360,fps=30"
[60] "name=Logitech QuickCam Pro 9000,size=640x400,fps=5"
[61] "name=Logitech QuickCam Pro 9000,size=640x400,fps=30"
[62] "name=Logitech QuickCam Pro 9000,size=864x480,fps=5"
[63] "name=Logitech QuickCam Pro 9000,size=864x480,fps=15"
[64] "name=Logitech QuickCam Pro 9000,size=768x480,fps=5"
[65] "name=Logitech QuickCam Pro 9000,size=768x480,fps=15"
[66] "name=Logitech QuickCam Pro 9000,size=800x450,fps=5"
[67] "name=Logitech QuickCam Pro 9000,size=800x450,fps=15"
[68] "name=Logitech QuickCam Pro 9000,size=800x500,fps=5"
[69] "name=Logitech QuickCam Pro 9000,size=800x500,fps=15"
[70] "name=Logitech QuickCam Pro 9000,size=800x600,fps=5"
[71] "name=Logitech QuickCam Pro 9000,size=800x600,fps=15"
[72] "name=Logitech QuickCam Pro 9000,size=960x720,fps=5"
[73] "name=Logitech QuickCam Pro 9000,size=960x720,fps=15"
[74] "name=Logitech QuickCam Pro 9000,size=1280x720,fps=5"
[75] "name=Logitech QuickCam Pro 9000,size=1280x800,fps=5"
[76] "name=Logitech QuickCam Pro 9000,size=1280x1024,fps=5"
[77] "name=Logitech QuickCam Pro 9000,size=1600x900,fps=5"
[78] "name=Logitech QuickCam Pro 9000,size=1600x1000,fps=5"
[79] "name=Logitech QuickCam Pro 9000,size=1600x1200,fps=5"
[80] "name=HD Pro Webcam C920,size=640x480,fps=5"
[81] "name=HD Pro Webcam C920,size=640x480,fps=30"
[82] "name=HD Pro Webcam C920,size=160x90,fps=5"
[83] "name=HD Pro Webcam C920,size=160x90,fps=30"
[84] "name=HD Pro Webcam C920,size=160x120,fps=5"
[85] "name=HD Pro Webcam C920,size=160x120,fps=30"
[86] "name=HD Pro Webcam C920,size=176x144,fps=5"
[87] "name=HD Pro Webcam C920,size=176x144,fps=30"
[88] "name=HD Pro Webcam C920,size=320x180,fps=5"
[89] "name=HD Pro Webcam C920,size=320x180,fps=30"
[90] "name=HD Pro Webcam C920,size=320x240,fps=5"
[91] "name=HD Pro Webcam C920,size=320x240,fps=30"
[92] "name=HD Pro Webcam C920,size=352x288,fps=5"
[93] "name=HD Pro Webcam C920,size=352x288,fps=30"
[94] "name=HD Pro Webcam C920,size=432x240,fps=5"
[95] "name=HD Pro Webcam C920,size=432x240,fps=30"
[96] "name=HD Pro Webcam C920,size=640x360,fps=5"
[97] "name=HD Pro Webcam C920,size=640x360,fps=30"
[98] "name=HD Pro Webcam C920,size=800x448,fps=5"
[99] "name=HD Pro Webcam C920,size=800x448,fps=30"
[100] "name=HD Pro Webcam C920,size=800x600,fps=5"
[101] "name=HD Pro Webcam C920,size=800x600,fps=24"
[102] "name=HD Pro Webcam C920,size=864x480,fps=5"
[103] "name=HD Pro Webcam C920,size=864x480,fps=24"
[104] "name=HD Pro Webcam C920,size=960x720,fps=5"
[105] "name=HD Pro Webcam C920,size=960x720,fps=15"
[106] "name=HD Pro Webcam C920,size=1024x576,fps=5"
[107] "name=HD Pro Webcam C920,size=1024x576,fps=15"
[108] "name=HD Pro Webcam C920,size=1280x720,fps=5"
[109] "name=HD Pro Webcam C920,size=1280x720,fps=10"
[110] "name=HD Pro Webcam C920,size=1600x896,fps=5"
[111] "name=HD Pro Webcam C920,size=1600x896,fps=15/2"
[112] "name=HD Pro Webcam C920,size=1920x1080,fps=5"
[113] "name=HD Pro Webcam C920,size=2304x1296,fps=2"
[114] "name=HD Pro Webcam C920,size=2304x1536,fps=2"
[115] "name=HD Pro Webcam C920,size=640x480,fps=5"
[116] "name=HD Pro Webcam C920,size=640x480,fps=30"
[117] "name=HD Pro Webcam C920,size=160x90,fps=5"
[118] "name=HD Pro Webcam C920,size=160x90,fps=30"
[119] "name=HD Pro Webcam C920,size=160x120,fps=5"
[120] "name=HD Pro Webcam C920,size=160x120,fps=30"
[121] "name=HD Pro Webcam C920,size=176x144,fps=5"
[122] "name=HD Pro Webcam C920,size=176x144,fps=30"
[123] "name=HD Pro Webcam C920,size=320x180,fps=5"
[124] "name=HD Pro Webcam C920,size=320x180,fps=30"
[125] "name=HD Pro Webcam C920,size=320x240,fps=5"
[126] "name=HD Pro Webcam C920,size=320x240,fps=30"
[127] "name=HD Pro Webcam C920,size=352x288,fps=5"
[128] "name=HD Pro Webcam C920,size=352x288,fps=30"
[129] "name=HD Pro Webcam C920,size=432x240,fps=5"
[130] "name=HD Pro Webcam C920,size=432x240,fps=30"
[131] "name=HD Pro Webcam C920,size=640x360,fps=5"
[132] "name=HD Pro Webcam C920,size=640x360,fps=30"
[133] "name=HD Pro Webcam C920,size=800x448,fps=5"
[134] "name=HD Pro Webcam C920,size=800x448,fps=30"
[135] "name=HD Pro Webcam C920,size=800x600,fps=5"
[136] "name=HD Pro Webcam C920,size=800x600,fps=30"
[137] "name=HD Pro Webcam C920,size=864x480,fps=5"
[138] "name=HD Pro Webcam C920,size=864x480,fps=30"
[139] "name=HD Pro Webcam C920,size=960x720,fps=5"
[140] "name=HD Pro Webcam C920,size=960x720,fps=30"
[141] "name=HD Pro Webcam C920,size=1024x576,fps=5"
[142] "name=HD Pro Webcam C920,size=1024x576,fps=30"
[143] "name=HD Pro Webcam C920,size=1280x720,fps=5"
[144] "name=HD Pro Webcam C920,size=1280x720,fps=30"
[145] "name=HD Pro Webcam C920,size=1600x896,fps=5"
[146] "name=HD Pro Webcam C920,size=1600x896,fps=30"
[147] "name=HD Pro Webcam C920,size=1920x1080,fps=5"
[148] "name=HD Pro Webcam C920,size=1920x1080,fps=30"
[149] "name=HD Pro Webcam C920,size=640x480,fps=5"
[150] "name=HD Pro Webcam C920,size=640x480,fps=30"
[151] "name=HD Pro Webcam C920,size=160x90,fps=5"
[152] "name=HD Pro Webcam C920,size=160x90,fps=30"
[153] "name=HD Pro Webcam C920,size=160x120,fps=5"
[154] "name=HD Pro Webcam C920,size=160x120,fps=30"
[155] "name=HD Pro Webcam C920,size=176x144,fps=5"
[156] "name=HD Pro Webcam C920,size=176x144,fps=30"
[157] "name=HD Pro Webcam C920,size=320x180,fps=5"
[158] "name=HD Pro Webcam C920,size=320x180,fps=30"
[159] "name=HD Pro Webcam C920,size=320x240,fps=5"
[160] "name=HD Pro Webcam C920,size=320x240,fps=30"
[161] "name=HD Pro Webcam C920,size=352x288,fps=5"
[162] "name=HD Pro Webcam C920,size=352x288,fps=30"
[163] "name=HD Pro Webcam C920,size=432x240,fps=5"
[164] "name=HD Pro Webcam C920,size=432x240,fps=30"
[165] "name=HD Pro Webcam C920,size=640x360,fps=5"
[166] "name=HD Pro Webcam C920,size=640x360,fps=30"
[167] "name=HD Pro Webcam C920,size=800x448,fps=5"
[168] "name=HD Pro Webcam C920,size=800x448,fps=30"
[169] "name=HD Pro Webcam C920,size=800x600,fps=5"
[170] "name=HD Pro Webcam C920,size=800x600,fps=30"
[171] "name=HD Pro Webcam C920,size=864x480,fps=5"
[172] "name=HD Pro Webcam C920,size=864x480,fps=30"
[173] "name=HD Pro Webcam C920,size=960x720,fps=5"
[174] "name=HD Pro Webcam C920,size=960x720,fps=30"
[175] "name=HD Pro Webcam C920,size=1024x576,fps=5"
[176] "name=HD Pro Webcam C920,size=1024x576,fps=30"
[177] "name=HD Pro Webcam C920,size=1280x720,fps=5"
[178] "name=HD Pro Webcam C920,size=1280x720,fps=30"
[179] "name=HD Pro Webcam C920,size=1600x896,fps=5"
[180] "name=HD Pro Webcam C920,size=1600x896,fps=30"
[181] "name=HD Pro Webcam C920,size=1920x1080,fps=5"
[182] "name=HD Pro Webcam C920,size=1920x1080,fps=30"
[183] "name=Camo,size=1280x720,fps=0"
[184] "name=Camo,size=1280x720,fps=30"

This will NOT apply to recent versions but does support your statement.

:)

moon · September 16, 2025, 6:08pm

Wow! My hunch was from working with camera inputs in the web browser. Very helpful, thank you, @glv

@danielcorbani I suppose for now, you can pop back into Processing 2.2.1 … sigh.

glv · September 16, 2025, 6:35pm

It has been a while but I recall doing things like this:

import processing.video.*;

Capture video;

void setup() {
  size(640, 480);

  // List all available cameras
  String[] cameras = Capture.list();
  printArray(cameras);
  
  // From list and used later!
  String myCameraString = "Logitech QuickCam Pro 9000 #1";
  
  // From Processing 2.2.1 (for reference only): 
  // [14] "name=Logitech QuickCam Pro 9000,size=320x240,fps=5"
  
  // Latest Processing:
  // https://processing.org/reference/libraries/video/Capture.html  
  // Capture(parent, width, height, device, fps) See reference.
  // Modified for Processing 4.4.7:
  
  video = new Capture(this, 300, 240, myCameraString, 5);
  
  video.start();
}

void draw() {
  if (video.available()) {
    video.read();
    image(video, 0, 0);
  }
}

Reference:

Capture / Libraries / Processing.org
Constructor (used in example):
Capture(parent, width, height, device, fps)

:)

You are welcome!
I manage to navigate my way around from experience and persistence.
Enjoy the ride!

:)

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Capture.list() showing duplicate cameras

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