diff --git a/.github/workflows/create_heroku_review_app.yaml b/.github/workflows/create_heroku_review_app.yaml
index 61605fb65..7e3ade03a 100644
--- a/.github/workflows/create_heroku_review_app.yaml
+++ b/.github/workflows/create_heroku_review_app.yaml
@@ -7,7 +7,7 @@ jobs:
   create-review-app:
     runs-on: ubuntu-latest
     steps:
-      - uses: fastruby/manage-heroku-review-app@9fa49f0320460f278c3687bc348dd0cbb18555dc # v1.3
+      - uses: kqito/manage-heroku-review-app@55e434ad5ac86f21cf2f7654de1566973fbc7046
         with:
           action: create
         env:
diff --git a/.github/workflows/destroy_heroku_review_app.yaml b/.github/workflows/destroy_heroku_review_app.yaml
index b2bf67949..cbcec744a 100644
--- a/.github/workflows/destroy_heroku_review_app.yaml
+++ b/.github/workflows/destroy_heroku_review_app.yaml
@@ -7,7 +7,7 @@ jobs:
   destroy-review-app:
     runs-on: ubuntu-latest
     steps:
-      - uses: fastruby/manage-heroku-review-app@9fa49f0320460f278c3687bc348dd0cbb18555dc # v1.3
+      - uses: kqito/manage-heroku-review-app@55e434ad5ac86f21cf2f7654de1566973fbc7046
         with:
           action: destroy
         env:
diff --git a/package.json b/package.json
index 88d45e67d..cc3400cb3 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   "devDependencies": {
     "@wsh-2025/configs": "workspace:*"
   },
-  "packageManager": "pnpm@9.14.2+sha512.6e2baf77d06b9362294152c851c4f278ede37ab1eba3a55fda317a4a17b209f4dbb973fb250a77abc463a341fcb1f17f17cfa24091c4eb319cda0d9b84278387",
+  "packageManager": "pnpm@10.6.5+sha512.cdf928fca20832cd59ec53826492b7dc25dc524d4370b6b4adbf65803d32efaa6c1c88147c0ae4e8d579a6c9eec715757b50d4fa35eea179d868eada4ed043af",
   "engines": {
     "node": "22.14.0"
   },
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 576486ce7..df83d5f8d 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -10,7 +10,7 @@ overrides:
 
 patchedDependencies:
   shaka-player:
-    hash: ztcamgtqc3a62la4l6p3d6w4ae
+    hash: cf783c59ad29e5efd7af6f6200527ede2fa7d67950876972a6127d280b3dad0c
     path: patches/shaka-player.patch
 
 importers:
@@ -39,9 +39,6 @@ importers:
       '@epic-web/restore-scroll':
         specifier: 1.1.1
         version: 1.1.1(react-router-dom@7.0.2(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(react@19.0.0)
-      '@ffmpeg/ffmpeg':
-        specifier: 0.12.15
-        version: 0.12.15
       '@headlessui/react':
         specifier: 2.2.0
         version: 2.2.0(react-dom@19.0.0(react@19.0.0))(react@19.0.0)
@@ -148,12 +145,6 @@ importers:
       '@babel/preset-typescript':
         specifier: 7.26.0
         version: 7.26.0(@babel/core@7.26.0)
-      '@ffmpeg/core':
-        specifier: 0.12.10
-        version: 0.12.10
-      '@ffmpeg/util':
-        specifier: 0.12.2
-        version: 0.12.2
       '@iconify/json':
         specifier: 2.2.317
         version: 2.2.317
@@ -207,7 +198,7 @@ importers:
         version: 1.5.17
       shaka-player:
         specifier: 4.12.5
-        version: 4.12.5(patch_hash=ztcamgtqc3a62la4l6p3d6w4ae)
+        version: 4.12.5(patch_hash=cf783c59ad29e5efd7af6f6200527ede2fa7d67950876972a6127d280b3dad0c)
       typescript:
         specifier: 5.7.2
         version: 5.7.2
@@ -1539,22 +1530,6 @@ packages:
   '@fastify/swagger@9.4.0':
     resolution: {integrity: sha512-3hF7asqyNfu41aeDA/ATlIG0RY4XizgaDqPR0nc1Unt3EiXWjkVMiELLaH5WZKNvB4BA/5Wovxdin7N4ii7YHw==}
 
-  '@ffmpeg/core@0.12.10':
-    resolution: {integrity: sha512-dzNplnn2Nxle2c2i2rrDhqcB19q9cglCkWnoMTDN9Q9l3PvdjZWd1HfSPjCNWc/p8Q3CT+Es9fWOR0UhAeYQZA==}
-    engines: {node: '>=16.x'}
-
-  '@ffmpeg/ffmpeg@0.12.15':
-    resolution: {integrity: sha512-1C8Obr4GsN3xw+/1Ww6PFM84wSQAGsdoTuTWPOj2OizsRDLT4CXTaVjPhkw6ARyDus1B9X/L2LiXHqYYsGnRFw==}
-    engines: {node: '>=18.x'}
-
-  '@ffmpeg/types@0.12.4':
-    resolution: {integrity: sha512-k9vJQNBGTxE5AhYDtOYR5rO5fKsspbg51gbcwtbkw2lCdoIILzklulcjJfIDwrtn7XhDeF2M+THwJ2FGrLeV6A==}
-    engines: {node: '>=16.x'}
-
-  '@ffmpeg/util@0.12.2':
-    resolution: {integrity: sha512-ouyoW+4JB7WxjeZ2y6KpRvB+dLp7Cp4ro8z0HIVpZVCM7AwFlHa0c4R8Y/a4M3wMqATpYKhC7lSFHQ0T11MEDw==}
-    engines: {node: '>=18.x'}
-
   '@floating-ui/core@1.6.9':
     resolution: {integrity: sha512-uMXCuQ3BItDUbAMhIXw7UPXRfAlOAvZzdK9BWpE60MCn+Svt3aLn9jsPTi/WNGlRUu2uI0v5S7JiIUsbsvh3fw==}
 
@@ -6436,16 +6411,6 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
-  '@ffmpeg/core@0.12.10': {}
-
-  '@ffmpeg/ffmpeg@0.12.15':
-    dependencies:
-      '@ffmpeg/types': 0.12.4
-
-  '@ffmpeg/types@0.12.4': {}
-
-  '@ffmpeg/util@0.12.2': {}
-
   '@floating-ui/core@1.6.9':
     dependencies:
       '@floating-ui/utils': 0.2.9
@@ -9813,7 +9778,7 @@ snapshots:
 
   setprototypeof@1.2.0: {}
 
-  shaka-player@4.12.5(patch_hash=ztcamgtqc3a62la4l6p3d6w4ae):
+  shaka-player@4.12.5(patch_hash=cf783c59ad29e5efd7af6f6200527ede2fa7d67950876972a6127d280b3dad0c):
     dependencies:
       eme-encryption-scheme-polyfill: 2.1.6
 
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 07b8a536d..817f96aea 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -4,3 +4,7 @@ packages:
   - ./workspaces/client
   - ./workspaces/server
   - ./workspaces/test
+onlyBuiltDependencies:
+  - bcrypt
+  - core-js
+  - esbuild
diff --git a/public/images/001.jpeg b/public/images/001.jpeg
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index 000000000..7c9107cf5
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diff --git a/public/images/036.jpeg b/public/images/036.jpeg
deleted file mode 100644
index 1f349e9ab..000000000
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diff --git a/public/images/036.webp b/public/images/036.webp
new file mode 100644
index 000000000..e143b0486
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diff --git a/public/images/037.jpeg b/public/images/037.jpeg
deleted file mode 100644
index b18bed87b..000000000
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diff --git a/public/images/037.webp b/public/images/037.webp
new file mode 100644
index 000000000..049ddad09
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diff --git a/workspaces/client/package.json b/workspaces/client/package.json
index f6c261693..8de039d5e 100644
--- a/workspaces/client/package.json
+++ b/workspaces/client/package.json
@@ -12,7 +12,6 @@
     "@better-fetch/fetch": "1.1.15",
     "@dhmk/zustand-lens": "5.0.0",
     "@epic-web/restore-scroll": "1.1.1",
-    "@ffmpeg/ffmpeg": "0.12.15",
     "@headlessui/react": "2.2.0",
     "@radix-ui/react-slider": "1.2.3",
     "@standard-schema/spec": "1.0.0",
@@ -50,8 +49,6 @@
     "@babel/preset-env": "7.26.0",
     "@babel/preset-react": "7.25.9",
     "@babel/preset-typescript": "7.26.0",
-    "@ffmpeg/core": "0.12.10",
-    "@ffmpeg/util": "0.12.2",
     "@iconify/json": "2.2.317",
     "@iconify/types": "2.0.0",
     "@types/lodash": "4.17.16",
diff --git a/workspaces/client/src/features/player/logics/create_player.ts b/workspaces/client/src/features/player/logics/create_player.ts
index 823364d27..933e529a8 100644
--- a/workspaces/client/src/features/player/logics/create_player.ts
+++ b/workspaces/client/src/features/player/logics/create_player.ts
@@ -20,7 +20,7 @@ class ShakaPlayerWrapper implements PlayerWrapper {
     this.playerType = playerType;
     this._player.configure({
       streaming: {
-        bufferingGoal: 50,
+        bufferingGoal: 6,
       },
     });
   }
@@ -72,8 +72,8 @@ class HlsJSPlayerWrapper implements PlayerWrapper {
     volume: 0.25,
   });
   private _player = new HlsJs({
-    enableWorker: false,
-    maxBufferLength: 50,
+    enableWorker: true,
+    maxBufferLength: 3,
   });
   readonly playerType: PlayerType.HlsJS;
 
@@ -135,8 +135,8 @@ class VideoJSPlayerWrapper implements PlayerWrapper {
 
   constructor(playerType: PlayerType.VideoJS) {
     const vhsConfig = (videojs as unknown as { Vhs: VhsConfig }).Vhs;
-    vhsConfig.GOAL_BUFFER_LENGTH = 50;
-    vhsConfig.MAX_GOAL_BUFFER_LENGTH = 50;
+    vhsConfig.GOAL_BUFFER_LENGTH = 3;
+    vhsConfig.MAX_GOAL_BUFFER_LENGTH = 6;
     this.playerType = playerType;
   }
 
diff --git a/workspaces/client/src/pages/episode/hooks/useSeekThumbnail.ts b/workspaces/client/src/pages/episode/hooks/useSeekThumbnail.ts
index 8d0015d89..ad37a4f44 100644
--- a/workspaces/client/src/pages/episode/hooks/useSeekThumbnail.ts
+++ b/workspaces/client/src/pages/episode/hooks/useSeekThumbnail.ts
@@ -1,7 +1,5 @@
-import { FFmpeg } from '@ffmpeg/ffmpeg';
 import { StandardSchemaV1 } from '@standard-schema/spec';
 import * as schema from '@wsh-2025/schema/src/api/schema';
-import { Parser } from 'm3u8-parser';
 import { use } from 'react';
 
 interface Params {
@@ -9,62 +7,8 @@ interface Params {
 }
 
 async function getSeekThumbnail({ episode }: Params) {
-  // HLS のプレイリストを取得
-  const playlistUrl = `/streams/episode/${episode.id}/playlist.m3u8`;
-  const parser = new Parser();
-  parser.push(await fetch(playlistUrl).then((res) => res.text()));
-  parser.end();
-
-  // FFmpeg の初期化
-  const ffmpeg = new FFmpeg();
-  await ffmpeg.load({
-    coreURL: await import('@ffmpeg/core?arraybuffer').then(({ default: b }) => {
-      return URL.createObjectURL(new Blob([b], { type: 'text/javascript' }));
-    }),
-    wasmURL: await import('@ffmpeg/core/wasm?arraybuffer').then(({ default: b }) => {
-      return URL.createObjectURL(new Blob([b], { type: 'application/wasm' }));
-    }),
-  });
-
-  // 動画のセグメントファイルを取得
-  const segmentFiles = await Promise.all(
-    parser.manifest.segments.map((s) => {
-      return fetch(s.uri).then(async (res) => {
-        const binary = await res.arrayBuffer();
-        return { binary, id: Math.random().toString(36).slice(2) };
-      });
-    }),
-  );
-  // FFmpeg にセグメントファイルを追加
-  for (const file of segmentFiles) {
-    await ffmpeg.writeFile(file.id, new Uint8Array(file.binary));
-  }
-
-  // セグメントファイルをひとつの mp4 動画に結合
-  await ffmpeg.exec(
-    [
-      ['-i', `concat:${segmentFiles.map((f) => f.id).join('|')}`],
-      ['-c:v', 'copy'],
-      ['-map', '0:v:0'],
-      ['-f', 'mp4'],
-      'concat.mp4',
-    ].flat(),
-  );
-
-  // fps=30 とみなして、30 フレームごと（1 秒ごと）にサムネイルを生成
-  await ffmpeg.exec(
-    [
-      ['-i', 'concat.mp4'],
-      ['-vf', "fps=30,select='not(mod(n\\,30))',scale=160:90,tile=250x1"],
-      ['-frames:v', '1'],
-      'preview.jpg',
-    ].flat(),
-  );
-
-  const output = await ffmpeg.readFile('preview.jpg');
-  ffmpeg.terminate();
-
-  return URL.createObjectURL(new Blob([output], { type: 'image/jpeg' }));
+  const playlistUrl = `/streams/episode/${episode.id}/preview.jpg`;
+  return playlistUrl;
 }
 
 const weakMap = new WeakMap<object, Promise<string>>();
diff --git a/workspaces/client/webpack.config.mjs b/workspaces/client/webpack.config.mjs
index 9164a996e..91bed05e4 100644
--- a/workspaces/client/webpack.config.mjs
+++ b/workspaces/client/webpack.config.mjs
@@ -64,8 +64,6 @@ const config = {
   ],
   resolve: {
     alias: {
-      '@ffmpeg/core$': path.resolve(import.meta.dirname, 'node_modules', '@ffmpeg/core/dist/umd/ffmpeg-core.js'),
-      '@ffmpeg/core/wasm$': path.resolve(import.meta.dirname, 'node_modules', '@ffmpeg/core/dist/umd/ffmpeg-core.wasm'),
     },
     extensions: ['.js', '.cjs', '.mjs', '.ts', '.cts', '.mts', '.tsx', '.jsx'],
   },
diff --git a/workspaces/server/database.sqlite b/workspaces/server/database.sqlite
index 5afaf4e28..f38e4f743 100644
Binary files a/workspaces/server/database.sqlite and b/workspaces/server/database.sqlite differ
diff --git a/workspaces/server/streams/caminandes2/preview.jpg b/workspaces/server/streams/caminandes2/preview.jpg
new file mode 100644
index 000000000..ba1ecaa61
Binary files /dev/null and b/workspaces/server/streams/caminandes2/preview.jpg differ
diff --git a/workspaces/server/streams/dailydweebs/preview.jpg b/workspaces/server/streams/dailydweebs/preview.jpg
new file mode 100644
index 000000000..b417f25a8
Binary files /dev/null and b/workspaces/server/streams/dailydweebs/preview.jpg differ
diff --git a/workspaces/server/streams/glasshalf/preview.jpg b/workspaces/server/streams/glasshalf/preview.jpg
new file mode 100644
index 000000000..a1d59961f
Binary files /dev/null and b/workspaces/server/streams/glasshalf/preview.jpg differ
diff --git a/workspaces/server/streams/wing-it/preview.jpg b/workspaces/server/streams/wing-it/preview.jpg
new file mode 100644
index 000000000..ffda7512b
Binary files /dev/null and b/workspaces/server/streams/wing-it/preview.jpg differ