Running on Linux / Wayland / Niri

[korken89]

Hi, thanks for this library!

I've been testing a bit and when I try to run the main.rs, it gives the output pipewire: State changed to error(no more input formats) and exits with a RecvError.
Does anyone know how to solve this? I tried the PR related to #132 , but it did not help.

I might be able to help debug, but I'm not quite sure what I'm looking for 😅

[korken89]

I extracted the pipewire node for the screen capture by starting OBS with a Screen Capture (Pipewire), which seemed to use the same dialog and expose the active node.

I compared the result with the config here and in #132 , but I can't really find anything that sticks out - does anyone have better eyes than me?
The only things I could find were wrong min/max for FrameRate and VideoSize, but I tried matching them just to see if it would help - but it did not.

  {
    "id": 93,
    "type": "PipeWire:Interface:Node",
    "version": 3,
    "permissions": [ "r", "w", "x", "m" ],
    "info": {
      "max-input-ports": 2,
      "max-output-ports": 0,
      "change-mask": [ "input-ports", "output-ports", "state", "props", "params" ],
      "n-input-ports": 1,
      "n-output-ports": 0,
      "state": "running",
      "error": null,
      "props": {
        "adapt.follower.spa-node": "",
        "client.id": 92,
        "clock.quantum-limit": 8192,
        "factory.id": 9,
        "library.name": "videoconvert/libspa-videoconvert",
        "media.category": "Capture",
        "media.class": "Stream/Input/Video",
        "media.name": "OBS Studio",
        "media.role": "Screen",
        "media.type": "Video",
        "node.async": true,
        "node.autoconnect": true,
        "node.driver-id": 90,
        "node.loop.class": "main",
        "node.loop.name": "PipeWire thread",
        "node.name": ".obs-wrapped",
        "node.target": 90,
        "node.want-driver": true,
        "object.id": 93,
        "object.register": false,
        "object.serial": 128,
        "port.group": "stream.0",
        "stream.is-live": true
      },
      "params": {
        "EnumFormat": [
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "BGRA",
            "modifier": {
              "default": 0,
              "alt1": 0,
              "alt2": 72057594037927937,
              "alt3": 72057594037927938,
              "alt4": 72057594037927942,
              "alt5": 72057594037927943,
              "alt6": 72057594037927944,
              "alt7": 72057594037927935
            },
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          },
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "RGBA",
            "modifier": {
              "default": 0,
              "alt1": 0,
              "alt2": 72057594037927937,
              "alt3": 72057594037927938,
              "alt4": 72057594037927942,
              "alt5": 72057594037927943,
              "alt6": 72057594037927944,
              "alt7": 72057594037927935
            },
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          },
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "BGRx",
            "modifier": {
              "default": 0,
              "alt1": 0,
              "alt2": 72057594037927937,
              "alt3": 72057594037927938,
              "alt4": 72057594037927942,
              "alt5": 72057594037927943,
              "alt6": 72057594037927944,
              "alt7": 72057594037927935
            },
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          },
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "RGBx",
            "modifier": {
              "default": 0,
              "alt1": 0,
              "alt2": 72057594037927937,
              "alt3": 72057594037927938,
              "alt4": 72057594037927942,
              "alt5": 72057594037927943,
              "alt6": 72057594037927944,
              "alt7": 72057594037927935
            },
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          },
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "ABGR_210LE",
            "modifier": {
              "default": 0,
              "alt1": 0,
              "alt2": 72057594037927937,
              "alt3": 72057594037927938,
              "alt4": 72057594037927942,
              "alt5": 72057594037927944,
              "alt6": 72057594037927935
            },
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          },
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "BGRA",
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          },
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "RGBA",
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          },
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "BGRx",
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          },
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "RGBx",
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          },
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "ABGR_210LE",
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          },
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "xBGR_210LE",
            "size": { "default": { "width": 1920, "height": 1080 }, "min": { "width": 1, "height": 1 }, "max": { "width": 8192, "height": 4320 } },
            "framerate": { "default": { "num": 60, "denom": 1 }, "min": { "num": 0, "denom": 1 }, "max": { "num": 360, "denom": 1 } }
          }
        ],
        "PropInfo": [ ],
        "Props": [ ],
        "Format": [
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "BGRx",
            "modifier": 72057594037927944,
            "size": { "width": 3840, "height": 2160 },
            "framerate": { "num": 0, "denom": 1 },
            "maxFramerate": { "num": 60000, "denom": 1000 }
          }
        ],
        "EnumPortConfig": [
          {
            "direction": "Input",
            "mode": "passthrough"
          }
        ],
        "PortConfig": [
          {
            "direction": "Input",
            "mode": "passthrough"
          }
        ],
        "Latency": [
          {
            "direction": "Output",
            "minQuantum": 0.000000,
            "maxQuantum": 0.000000,
            "minRate": 0,
            "maxRate": 0,
            "minNs": 0,
            "maxNs": 0
          }
        ],
        "ProcessLatency": [
        ],
        "Tag": [ ]
      }
    }
  },

[korken89]

Wait, I was able to stop scap at the right moment and it was looking at another node - sorry for the confusion!
Here is the node, I've not had time to analyze it yet for errors:

  {
    "id": 90,
    "type": "PipeWire:Interface:Node",
    "version": 3,
    "permissions": [ "r", "w", "x", "m" ],
    "info": {
      "max-input-ports": 0,
      "max-output-ports": 2,
      "change-mask": [ "input-ports", "output-ports", "state", "props", "params" ],
      "n-input-ports": 0,
      "n-output-ports": 1,
      "state": "suspended",
      "error": null,
      "props": {
        "adapt.follower.spa-node": "",
        "client.id": 77,
        "clock.quantum-limit": 8192,
        "factory.id": 9,
        "library.name": "videoconvert/libspa-videoconvert",
        "media.class": "Stream/Output/Video",
        "media.name": "niri-screen-cast-src",
        "node.async": true,
        "node.driver": true,
        "node.loop.class": "main",
        "node.loop.name": "main-loop",
        "node.name": "niri",
        "node.want-driver": true,
        "object.id": 90,
        "object.register": false,
        "object.serial": 215,
        "port.group": "stream.0",
        "stream.is-live": true
      },
      "params": {
        "EnumFormat": [
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "BGRx",
            "modifier": {
              "default": 0,
              "alt1": 0,
              "alt2": 72057594037927937,
              "alt3": 72057594037927938,
              "alt4": 72057594037927942,
              "alt5": 72057594037927944,
              "alt6": 72057594037927935
            },
            "size": { "width": 3840, "height": 2160 },
            "framerate": { "num": 0, "denom": 1 },
            "maxFramerate": { "default": { "num": 60000, "denom": 1000 }, "min": { "num": 1, "denom": 1 }, "max": { "num": 60000, "denom": 1000 } }
          }
        ],
        "PropInfo": [ ],
        "Props": [ ],
        "Format": [ ],
        "EnumPortConfig": [
          {
            "direction": "Output",
            "mode": "passthrough"
          }
        ],
        "PortConfig": [
          {
            "direction": "Output",
            "mode": "passthrough"
          }
        ],
        "Latency": [ ],
        "ProcessLatency": [
        ],
        "Tag": [ ]
      }
    }
  },
  {
    "id": 90,
    "type": "PipeWire:Interface:Node",
    "version": 3,
    "permissions": [ "r", "w", "x", "m" ],
    "info": {
      "max-input-ports": 0,
      "max-output-ports": 2,
      "change-mask": [ "input-ports", "output-ports", "state", "props", "params" ],
      "n-input-ports": 0,
      "n-output-ports": 1,
      "state": "suspended",
      "error": null,
      "props": {
        "adapt.follower.spa-node": "",
        "client.id": 77,
        "clock.quantum-limit": 8192,
        "factory.id": 9,
        "library.name": "videoconvert/libspa-videoconvert",
        "media.class": "Stream/Output/Video",
        "media.name": "niri-screen-cast-src",
        "node.async": true,
        "node.driver": true,
        "node.loop.class": "main",
        "node.loop.name": "main-loop",
        "node.name": "niri",
        "node.want-driver": true,
        "object.id": 90,
        "object.register": false,
        "object.serial": 215,
        "port.group": "stream.0",
        "stream.is-live": true
      },
      "params": {
        "EnumFormat": [
          {
            "mediaType": "video",
            "mediaSubtype": "raw",
            "format": "BGRx",
            "modifier": {
              "default": 0,
              "alt1": 0,
              "alt2": 72057594037927937,
              "alt3": 72057594037927938,
              "alt4": 72057594037927942,
              "alt5": 72057594037927944,
              "alt6": 72057594037927935
            },
            "size": { "width": 3840, "height": 2160 },
            "framerate": { "num": 0, "denom": 1 },
            "maxFramerate": { "default": { "num": 60000, "denom": 1000 }, "min": { "num": 1, "denom": 1 }, "max": { "num": 60000, "denom": 1000 } }
          }
        ],
        "PropInfo": [ ],
        "Props": [ ],
        "Format": [ ],
        "EnumPortConfig": [
          {
            "direction": "Output",
            "mode": "passthrough"
          }
        ],
        "PortConfig": [
          {
            "direction": "Output",
            "mode": "passthrough"
          }
        ],
        "Latency": [ ],
        "ProcessLatency": [
        ],
        "Tag": [ ]
      }
    }
  },

[korken89]

Ooohh, if I change pw::spa::utils::Fraction { num: 60, denom: 1 } to pw::spa::utils::Fraction { num: 60000, denom: 1000 } (from #149) it starts working 🎉
It seems pipewire is really picky about the fraction, and it does not do reduction to check if the two above are equal.