🎬 ConditionalVideos

Server-aware cinematic triggers for Minecraft. Configure conditions once and let clients play synced videos — local files, URLs, or full playlists — exactly when it matters.

✨ Overview

ConditionalVideos plays custom videos when specific in-game events are detected. It is not strictly client-side: it runs on both client and dedicated server, with different responsibilities in each environment.

It is designed for curated gameplay experiences such as servers, story maps, quest packs, and roleplay setups where cinematic feedback improves immersion.

🧩 Compatibility & Requirements

• Minecraft Version: 1.20.1
• Loaders: Fabric, Forge
• Java: 17+
• Client Config File: config/conditionalvideos.json
• Dedicated Server Config File: config/conditionalvideos-server.json
• Required Fabric API (Fabric only)
• Required WATERMeDIA: Multimedia API v3 (client side)
• Required WATERMeDIA: Native Binaries (client side, ships with WATERMeDIA)
• Optional WATERMeDIA: YouTube Extension — required only if your config uses YouTube URLs

Update 1.2.0 will arrive for versions 1.21.1 later!

🧭 Client vs Server (Important)

Client Instance

• Creates and uses:
  • config/conditionalvideos.json
• In singleplayer:
  • Uses local client config directly.
  • Local source paths are resolved from the local game directory (or absolute path).
  • URL sources (http://, https://, YouTube links) are streamed directly through WATERMeDIA.
• In multiplayer:
  • Acts as a passive receiver for server data.
  • Receives synced server config at runtime (it does not use your local client rules for server gameplay).
  • Downloads server-provided local-file videos to cache and reuses them on reconnect.
  • URL sources defined by the server are streamed directly by the client without going through the file transfer pipeline.
  • Cache location pattern:
  • config/conditionalvideos/<server-id>/<condition-type>/<file>
• On disconnect:
  • Synced runtime state is cleared and re-requested next time you join.

Dedicated Server Instance

• Creates and uses:
  • config/conditionalvideos-server.json
• Owns the authoritative config for connected clients.
• On player join:
  • Sends synced config to clients.
  • Publishes a manifest of configured local-file videos (URLs are excluded — the client fetches them by itself).
  • Serves missing/outdated files to clients in 32 KiB chunks. Each chunk is verified by sha256 before it is moved into the client cache.
• If you replace a video file on server or change path/config:
  • Clients detect hash mismatch and re-download updated files automatically.

What this means in practice

• Clients still need the mod installed to receive/play synced videos from the server.
• You can install video assets only on the server and clients will receive needed files automatically.
• URLs (including YouTube links) do not need to be deployed to the server filesystem — the client streams them directly. They only need to be reachable from the client.
• Local client config stays useful for singleplayer testing, but does not override dedicated-server behavior in multiplayer.
• For multiplayer content pipelines, treat conditionalvideos-server.json as the source of truth.

⏳ Multiplayer Loading Screen

Whenever any condition is about to play a local-file video that lives in the server manifest but has not been downloaded into the local cache yet, a full-screen loading overlay (black background + animated spinner + translatable text) takes over while the file is transferred in the background. Vanilla Minecraft sounds are muted during the wait, and as soon as the download finishes the loading screen hands off seamlessly to the playback screen.

• Applies to every condition (firstJoin, playerDeath, deathByEntity, entityKilled, advancementCompleted, dimensionChanged) — not just the first-join cinematic.
• For firstJoin specifically, the server also puts the player in Spectator from the moment the loading screen appears until the playback finishes, so the world is invisible and silent during the wait. Other conditions only show the overlay; gameplay keeps running underneath them, matching the existing behavior of the playback screen.
• URL/YouTube sources skip the loading screen — WATERMeDIA handles buffering directly inside the playback screen.
• Already-cached files skip the loading screen and jump straight to playback.
• If the server is unreachable or the download stalls, the loading screen times out after about a minute and the player resumes normal gameplay.

🎯 Supported Conditions

Supports multiple gameplay trigger types so you can tailor cinematic playback to meaningful moments during progression.

• First connection trigger (firstJoin) Plays an intro/cinematic when the player enters the world/session.

• General death trigger (playerDeath) Works as the default fallback cinematic for any player death event.

• Death by entity trigger (deathByEntity) Lets you override the generic death behavior with custom videos based on the killer entity ID (namespace:entity), such as minecraft:zombie or minecraft:creeper. When this trigger matches, it takes precedence over the general death trigger.

• Entity kill trigger (entityKilled) Plays a video when the player defeats specific configured entity IDs.

• Advancement completion trigger (advancementCompleted) Plays a video when configured advancements are completed.

• Dimension transition trigger (dimensionChanged) Plays a video when the player enters configured dimensions.

🧱 Condition Object Schema

Each condition entry now holds a playlist under videos: [...] plus a few shared flags. Each item in videos is a VideoEntry describing a single clip plus its overlay/skip/loop/transition options.

Shared condition fields

VideoEntry fields

Loop semantics: videoLoop = true implies skippable = true. The skip hint stays hidden after the first loop iteration so the on-screen text does not flicker on every replay.

Playlist transitions: transition is a property of the incoming entry. For example, if videos[1].transition = "fadeOut/In", the player fades out videos[0] while fading in videos[1]. cut is an instant frame-perfect swap.

🌐 Source Resolution

Each source is classified automatically:

In multiplayer the server only ships local-file sources to clients. URLs in the synced server config are passed through verbatim, and each client opens them independently.

📁 Path Rules by Environment

Singleplayer / Client-only local playback

• source can be:
  • Relative path (resolved from game directory)
  • Absolute path
  • URL / YouTube link

Dedicated server playback for connected clients

• Server resolves local source paths from the server filesystem.
• Client does not need that same path to exist locally — server-provided files are streamed and cached automatically.
• URLs configured on the server are sent verbatim and resolved on each client.

Recommendation: keep all server video assets in a dedicated folder (for example videos/) and reference them with relative paths in conditionalvideos-server.json.

⌨️ In-Game Controls

While a video is playing:

• Tap ESC → skip to the next playlist entry (or close the playback if it is the last one). Looped entries are interrupted as well.
• Hold ESC for ~1 second, then release → close the playback screen entirely without queuing the next entry. The release-after-hold behavior prevents the in-world pause menu from toggling repeatedly if you keep the key pressed.
• The mouse cursor auto-hides after a few seconds of inactivity and reappears the moment the mouse moves.
• Vanilla Minecraft sounds are muted while a video (or the multiplayer loading screen) is on screen.

skippable = false disables both the tap and hold behaviors for that entry; the player must wait for it to finish or for the playlist to advance via nextAt / videoLoop = false.

🌍 Localization

UI strings (Press ESC to skip, Loading video…) ship in four locales out of the box:

• en_us
• es_es
• es_ar
• es_mx

Additional translations can be added by dropping a new <locale>.json into a resource pack under assets/conditionalvideos/lang/.

🔁 Session Tracking Field

The config includes one internal tracking field managed by the mod:

• consumedConditionSessions
  • Stores condition/session keys that were already consumed when repeatableInSameSession is false.
  • Prevents non-repeatable conditions from replaying in the same session.

You usually should not edit this field manually unless you intentionally want to reset session trigger history for testing.

🔄 Config Migration

The on-disk schema is versioned via configVersion. Configs created by ConditionalVideos 1.1.x (with the legacy video: "..." field per condition) are migrated automatically the first time 1.2.0 reads them:

1. A backup of the original file is written next to it as conditionalvideos.json.bak-v<previousVersion> (or conditionalvideos-server.json.bak-v...).
2. Each legacy condition's video string and decorator fields are folded into a single-entry videos: [...] playlist.
3. The file is rewritten with configVersion: 2.

If you want to revert, the .bak-v1 file is left untouched and you can restore it manually.

🗂️ Full config/conditionalvideos.json or config/conditionalvideos-server.json Example

{
  "configVersion": 2,
  "firstJoin": {
    "repeatableInSameSession": false,
    "playlistLoop": false,
    "videos": [
      {
        "source": "videos/intro_part1.mp4",
        "skippable": true,
        "enableBackground": true,
        "colorBackground": "#FF000000",
        "videoTitle": "&6&lWelcome",
        "videoTitlePosition": "topLeft",
        "videoDescription": "&fEnjoy your journey",
        "videoDescriptionPosition": "topLeft",
        "titleTextScale": 1.4,
        "descriptionTextScale": 1.0,
        "textBoxOpacity": 0.5,
        "videoVolume": 0.8,
        "nextAt": 8.0
      },
      {
        "source": "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
        "skippable": true,
        "enableBackground": true,
        "colorBackground": "#FF000000",
        "videoVolume": 1.0,
        "transition": "fadeOut/In"
      }
    ]
  },
  "playerDeath": {
    "repeatableInSameSession": true,
    "playlistLoop": false,
    "videos": [
      {
        "source": "videos/death/default_death.mp4",
        "skippable": true,
        "enableBackground": true,
        "colorBackground": "#AA000000",
        "videoTitle": "&cYou Died",
        "videoTitlePosition": "bottomLeft",
        "videoDescription": "&7Try again",
        "videoDescriptionPosition": "bottomLeft"
      }
    ]
  },
  "entityKilled": {
    "minecraft:skeleton": {
      "repeatableInSameSession": true,
      "videos": [
        {
          "source": "videos/kills/skeleton.mp4",
          "skippable": true,
          "enableBackground": false,
          "colorBackground": "#000000",
          "videoTitle": "&fSkeleton Defeated",
          "videoTitlePosition": "topRight",
          "videoDescription": "&7Nice shot",
          "videoDescriptionPosition": "topRight"
        }
      ]
    },
    "minecraft:warden": {
      "repeatableInSameSession": false,
      "videos": [
        {
          "source": "videos/kills/warden.mp4",
          "skippable": false,
          "enableBackground": true,
          "colorBackground": "#CC000000",
          "videoTitle": "&5&lEpic Victory",
          "videoTitlePosition": "topRight",
          "videoDescription": "&dYou defeated the Warden",
          "videoDescriptionPosition": "topRight",
          "titleTextScale": 1.6
        }
      ]
    }
  },
  "deathByEntity": {
    "minecraft:zombie": {
      "repeatableInSameSession": true,
      "videos": [
        {
          "source": "videos/death/zombie_death.mp4",
          "skippable": true,
          "enableBackground": true,
          "colorBackground": "#B0000000",
          "videoTitle": "&2A Zombie got you",
          "videoTitlePosition": "bottomRight",
          "videoDescription": "&7Watch your back at night",
          "videoDescriptionPosition": "bottomRight"
        }
      ]
    },
    "minecraft:creeper": {
      "repeatableInSameSession": false,
      "videos": [
        {
          "source": "videos/death/creeper_death.mp4",
          "skippable": true,
          "enableBackground": true,
          "colorBackground": "#99000000",
          "videoTitle": "&aBoom...",
          "videoTitlePosition": "bottomRight",
          "videoDescription": "&7A Creeper surprised you",
          "videoDescriptionPosition": "bottomRight"
        }
      ]
    }
  },
  "advancementCompleted": {
    "minecraft:story/mine_diamond": {
      "repeatableInSameSession": false,
      "videos": [
        {
          "source": "videos/advancements/diamond.mp4",
          "skippable": true,
          "enableBackground": false,
          "colorBackground": "#000000",
          "videoTitle": "&bDiamonds!",
          "videoTitlePosition": "topLeft",
          "videoDescription": "&fFirst diamond obtained",
          "videoDescriptionPosition": "topLeft"
        }
      ]
    },
    "minecraft:nether/root": {
      "repeatableInSameSession": false,
      "videos": [
        {
          "source": "videos/advancements/nether_entry.mp4",
          "skippable": true,
          "enableBackground": true,
          "colorBackground": "#AA1A0000",
          "videoTitle": "&4Welcome to the Nether",
          "videoTitlePosition": "topLeft",
          "videoDescription": "&7Temperature rising",
          "videoDescriptionPosition": "topLeft"
        }
      ]
    }
  },
  "dimensionChanged": {
    "minecraft:the_nether": {
      "repeatableInSameSession": true,
      "playlistLoop": true,
      "videos": [
        {
          "source": "videos/dimensions/nether_loop.mp4",
          "skippable": true,
          "videoLoop": true,
          "enableBackground": true,
          "colorBackground": "#CC000000",
          "videoTitle": "&cEntered the Nether",
          "videoTitlePosition": "bottomLeft",
          "videoDescription": "&7Press ESC when you are ready",
          "videoDescriptionPosition": "bottomLeft"
        }
      ]
    },
    "minecraft:the_end": {
      "repeatableInSameSession": false,
      "videos": [
        {
          "source": "videos/dimensions/end.mp4",
          "skippable": false,
          "enableBackground": true,
          "colorBackground": "#CC000000",
          "videoTitle": "&5The End awaits",
          "videoTitlePosition": "bottomLeft",
          "videoDescription": "&dPrepare for the dragon",
          "videoDescriptionPosition": "bottomLeft"
        }
      ]
    }
  },
  "consumedConditionSessions": []
}

🛠️ Support

• Found a bug or want to request a feature?