@opmeyer1

Hi! 

Thanks for making such a detailed bug report. Tagging our team here to log the bug report / get that into our system.

@woland @dusx

Hi Isadora team — short bug report and recommended fix for matching input signal pixel formats to capture setting pixel formats UltraStudio 4K Mini HDMI RGB/YUV feeds.

Problem (symptoms): When Isadora opens the Blackmagic driver the device is forced into YUV 4:2:2 input mode, producing a black preview even though the incoming HDMI signal is present at 1080p60 RGB 10‑bit. Launching Blackmagic Media Express immediately reconfigures the device to RGB10 and the image returns.

Possible root cause: Isadora is calling the Desktop Video API without negotiating or selecting the correct pixel format/display mode (or is explicitly requesting a YUV pixel format). The Blackmagic driver will accept an explicit RGB10 request or perform auto‑negotiation if asked; currently Isadora’s call path forces YUV.

Recommended fix 

1. Negotiate display mode + pixel format on open — call the Desktop Video API to enumerate supported display modes (GetDisplayModeIterator / display mode list) and choose the exact 1080p60 mode reported by the device.
2. Request RGB10 explicitly when available — call EnableVideoInput (or equivalent) with the matching display mode and bmdFormat10BitRGB (or the SDK constant for 10‑bit RGB).
3. Expose a UI override — add a simple capture setting: Pixel Format: Auto / Force RGB10/ Force RGB8/ Force YUV422 for troubleshooting and edge cases.

I personally did up to 10, using a Blackmagic Decklink Quad (8 Outputs), and two HDMI ports (control monitor / additional monitor for the backstage crew)

With a RTX 4090, and a speedy CPU you should be able to push that to do a Blackmagic Decklink + a Datapath FX4.

@ray said:

I already have an rtx 4090 and an rtx 3070 installed

@DusX Could you please provide advice about working with multiple graphics cards on Windows? 

I always forget if this is a no-no or something that's fine to do after some specific configuration.

@skulpture said:

Get a datapath FX4 or similar. It takes a single 4k input and splits it into quads; then you get 4 individual FHD outputs.https://www.datapath.co.uk/dat... 

 This would be my suggestion as well

@ubik

Can you send the patch either here (if you're comfortable) or in a support ticket (see the link in my signature) so we can take a look at it? In medical terms, it can be hard to diagnose a patient over the phone rather than through a physical exam.

Hello all,

There have been a few questions in the past few months, so I just wanted to give a *very* quick and dirty explanation of how to connect Isadora to Rokoko Studio in order to get tracking data from the Rokoko Smartsuit Pro/Pro II and Smart Gloves.

Setup Steps: 

1. Download and install Isadora
2. If you don't have an Isadora license and want to be able to save your work, purchase an Isadora License
   • Note: There are short-term and long-term options for licenses. Check the store for more details.
3. Download and install Rokoko Studio from Rokoko's website.
   • Note: This software is what collects the live data from the suit/gloves
4. Get a Rokoko Plus subscription so that you can stream the data to Isadora from the Rokoko Studio Software.
5. Get your suit/gloves connected to your WiFi and ensure they show up in Rokoko Studio
   • Note: If you are having trouble, feel free to consult:
     • Rokoko's Onboarding Essentials YouTube playlist
     • Rokoko's help articles
6. Download the Rokoko Studio Live Watcher Add-On, unzip it, and follow the setup steps inside to connect Rokoko Studio to Isadora
   • Note: If you are having trouble, feel free to consult Rokoko's article on connecting Rokoko Studio to Isadora.

@nic

Here is a GLSL shader, that will unwarp a 'fisheye' (its not going to be perfect, since its not calibrated to any specific lens), but it should provide a decent result.

/*
Fisheye Correction - Fragment Shader
For Isadora GLSL Shader actor
*/
// ISADORA_PLUGIN_NAME("Fisheye Correction")
// ISADORA_PLUGIN_DESC("Corrects fisheye lens distortion from an input video stream to create a flatter, non-fisheye output.")
// ISADORA_FLOAT_PARAM(strength, strn, 0.0, 200.0, 100.0, "Amount of fisheye correction. Higher values remove more barrel distortion.")
uniform float strength;
// ISADORA_FLOAT_PARAM(zoom, zoom, 50.0, 200.0, 115.0, "Zooms the corrected image to hide curved black edges.")
uniform float zoom;
// ISADORA_FLOAT_PARAM(horz_center, ctrx, -100.0, 100.0, 0.0, "Horizontal center of the lens correction.")
uniform float horz_center;
// ISADORA_FLOAT_PARAM(vert_center, ctry, -100.0, 100.0, 0.0, "Vertical center of the lens correction.")
uniform float vert_center;
// ISADORA_FLOAT_PARAM(edge_softness, edge, 0.0, 20.0, 2.0, "Softens the edge where the corrected image runs outside the source.")
uniform float edge_softness;
// Built-in Isadora uniforms
uniform vec2 resolution;
uniform sampler2D tex0;
void main(void)
{
    vec2 uv = gl_TexCoord[0].xy;
    // Move coordinates so that 0,0 is the image center.
    vec2 center = vec2(0.5) + vec2(horz_center, vert_center) / 200.0;
    vec2 p = uv - center;
    // Correct for non-square aspect ratio.
    float aspect = resolution.x / resolution.y;
    p.x *= aspect;
    // Zoom after correction. Higher zoom crops the outer edges.
    p /= zoom / 100.0;
    // Distance from lens center.
    float r = length(p);
    // Barrel/fisheye correction.
    // The shader samples farther outward as pixels move from the center,
    // which visually straightens fisheye-curved lines.
    float k = strength / 100.0;
    float corrected_r = r * (1.0 + k * r * r);
    vec2 corrected_p = p;
    if (r > 0.00001) {
        corrected_p = normalize(p) * corrected_r;
    }
    // Undo aspect correction and return to texture coordinates.
    corrected_p.x /= aspect;
    vec2 sample_uv = corrected_p + center;
    // Create a soft mask so out-of-range areas fade to black.
    float soft = edge_softness / 100.0;
    float mask_x = smoothstep(0.0, soft, sample_uv.x) *
                   smoothstep(0.0, soft, 1.0 - sample_uv.x);
    float mask_y = smoothstep(0.0, soft, sample_uv.y) *
                   smoothstep(0.0, soft, 1.0 - sample_uv.y);
    float mask = mask_x * mask_y;
    // Clamp sampling to avoid texture wrapping artifacts.
    sample_uv = clamp(sample_uv, vec2(0.0), vec2(1.0));
    vec4 color = texture2D(tex0, sample_uv);
    gl_FragColor = vec4(color.rgb * mask, color.a);
}

Hi all, 

Does anyone know a way to undistort a feed from a fisheye lens? I know there is an actor to create a fisheye effect, but I wondered if there is some way of undoing the distortion?

Nic

I like the Blackmagic Decklink Quad (8 switchable in/out). It's under Capture and Playback, here: Products | Blackmagic Design

The one I have seems to have been replaced by a newer version, but I found it on eBay: Blackmagic Design BMDPCB143A DeckLink Quad PCIe SDI Capture Card | eBay

Cheers,

Hugh