diff --git a/libs/ui/playback/src/lib/playback-diagnostics/playback-diagnostics.model.ts b/libs/ui/playback/src/lib/playback-diagnostics/playback-diagnostics.model.ts
new file mode 100644
index 000000000..bcbb2c9ed
--- /dev/null
+++ b/libs/ui/playback/src/lib/playback-diagnostics/playback-diagnostics.model.ts
@@ -0,0 +1,97 @@
+import type {
+    ExternalPlayerName,
+    ResolvedPortalPlayback,
+} from 'shared-interfaces';
+
+export const PlaybackDiagnosticCode = {
+    UnsupportedContainer: 'unsupported-container',
+    UnsupportedCodec: 'unsupported-codec',
+    MediaDecodeError: 'media-decode-error',
+    NetworkError: 'network-error',
+    BrowserAccessError: 'browser-access-error',
+    DrmOrEncryption: 'drm-or-encryption',
+    UnknownPlaybackError: 'unknown-playback-error',
+} as const;
+
+export type PlaybackDiagnosticCode =
+    (typeof PlaybackDiagnosticCode)[keyof typeof PlaybackDiagnosticCode];
+
+export const PlaybackDiagnosticSource = {
+    Source: 'source',
+    Native: 'native',
+    Hls: 'hls',
+    MpegTs: 'mpegts',
+} as const;
+
+export type PlaybackDiagnosticSource =
+    (typeof PlaybackDiagnosticSource)[keyof typeof PlaybackDiagnosticSource];
+
+export const InlinePlaybackPlayer = {
+    VideoJs: 'videojs',
+    Html5: 'html5',
+    ArtPlayer: 'artplayer',
+} as const;
+
+export type InlinePlaybackPlayer =
+    (typeof InlinePlaybackPlayer)[keyof typeof InlinePlaybackPlayer];
+
+export interface PlaybackSourceMetadataInput {
+    readonly url: string;
+    readonly mimeType?: string;
+    readonly player?: InlinePlaybackPlayer;
+    readonly audioCodecs?: readonly string[];
+    readonly videoCodecs?: readonly string[];
+}
+
+export interface PlaybackSourceMetadata {
+    readonly url: string;
+    readonly extension: string;
+    readonly container: string;
+    readonly mimeType?: string;
+    readonly player?: InlinePlaybackPlayer;
+    readonly audioCodecs: readonly string[];
+    readonly videoCodecs: readonly string[];
+}
+
+export interface NativePlaybackErrorInput {
+    readonly code?: number;
+    readonly message?: string;
+}
+
+export interface HlsPlaybackErrorInput {
+    readonly type?: string;
+    readonly details?: string;
+    readonly fatal?: boolean;
+    readonly message?: string;
+    readonly error?: unknown;
+    readonly audioCodecs?: readonly string[];
+    readonly videoCodecs?: readonly string[];
+}
+
+export interface MpegTsPlaybackErrorInput {
+    readonly type?: string;
+    readonly details?: string;
+    readonly message?: string;
+    readonly info?: unknown;
+}
+
+export interface PlaybackDiagnostic {
+    readonly code: PlaybackDiagnosticCode;
+    readonly source: PlaybackDiagnosticSource;
+    readonly sourceUrl: string;
+    readonly container: string;
+    readonly mimeType?: string;
+    readonly player?: InlinePlaybackPlayer;
+    readonly audioCodecs: readonly string[];
+    readonly videoCodecs: readonly string[];
+    readonly details?: string;
+    readonly nativeErrorCode?: number;
+    readonly nativeErrorMessage?: string;
+    readonly externalFallbackRecommended: boolean;
+}
+
+export interface PlaybackFallbackRequest {
+    readonly player: ExternalPlayerName;
+    readonly playback: ResolvedPortalPlayback;
+    readonly diagnostic: PlaybackDiagnostic;
+}
diff --git a/libs/ui/playback/src/lib/playback-diagnostics/playback-diagnostics.util.ts b/libs/ui/playback/src/lib/playback-diagnostics/playback-diagnostics.util.ts
index c0b32e744..a36024acb 100644
--- a/libs/ui/playback/src/lib/playback-diagnostics/playback-diagnostics.util.ts
+++ b/libs/ui/playback/src/lib/playback-diagnostics/playback-diagnostics.util.ts
@@ -1,237 +1,37 @@
-import { getExtensionFromUrl } from 'm3u-utils';
 import type {
-    ExternalPlayerName,
-    ResolvedPortalPlayback,
-} from 'shared-interfaces';
+    HlsPlaybackErrorInput,
+    MpegTsPlaybackErrorInput,
+    NativePlaybackErrorInput,
+    PlaybackDiagnostic,
+    PlaybackDiagnosticCode,
+    PlaybackDiagnosticSource,
+    PlaybackSourceMetadata,
+} from './playback-diagnostics.model';
+import { PlaybackDiagnosticCode as DiagnosticCode } from './playback-diagnostics.model';
+import { PlaybackDiagnosticSource as DiagnosticSource } from './playback-diagnostics.model';
+import {
+    isBrowserAccessFailure,
+    isCodecFailure,
+    isDrmOrEncryptionFailure,
+    isNetworkFailure,
+    normalizeErrorDetails,
+} from './playback-error-patterns.util';
+import {
+    isLikelyContainerIssue,
+    mergeCodecMetadata,
+} from './playback-media-source.util';
 
-export const PlaybackDiagnosticCode = {
-    UnsupportedContainer: 'unsupported-container',
-    UnsupportedCodec: 'unsupported-codec',
-    MediaDecodeError: 'media-decode-error',
-    NetworkError: 'network-error',
-    BrowserAccessError: 'browser-access-error',
-    DrmOrEncryption: 'drm-or-encryption',
-    UnknownPlaybackError: 'unknown-playback-error',
-} as const;
-
-export type PlaybackDiagnosticCode =
-    (typeof PlaybackDiagnosticCode)[keyof typeof PlaybackDiagnosticCode];
-
-export const PlaybackDiagnosticSource = {
-    Source: 'source',
-    Native: 'native',
-    Hls: 'hls',
-    MpegTs: 'mpegts',
-} as const;
-
-export type PlaybackDiagnosticSource =
-    (typeof PlaybackDiagnosticSource)[keyof typeof PlaybackDiagnosticSource];
-
-export const InlinePlaybackPlayer = {
-    VideoJs: 'videojs',
-    Html5: 'html5',
-    ArtPlayer: 'artplayer',
-} as const;
-
-export type InlinePlaybackPlayer =
-    (typeof InlinePlaybackPlayer)[keyof typeof InlinePlaybackPlayer];
-
-export interface PlaybackSourceMetadataInput {
-    readonly url: string;
-    readonly mimeType?: string;
-    readonly player?: InlinePlaybackPlayer;
-    readonly audioCodecs?: readonly string[];
-    readonly videoCodecs?: readonly string[];
-}
-
-export interface PlaybackSourceMetadata {
-    readonly url: string;
-    readonly extension: string;
-    readonly container: string;
-    readonly mimeType?: string;
-    readonly player?: InlinePlaybackPlayer;
-    readonly audioCodecs: readonly string[];
-    readonly videoCodecs: readonly string[];
-}
-
-export interface NativePlaybackErrorInput {
-    readonly code?: number;
-    readonly message?: string;
-}
-
-export interface HlsPlaybackErrorInput {
-    readonly type?: string;
-    readonly details?: string;
-    readonly fatal?: boolean;
-    readonly message?: string;
-    readonly error?: unknown;
-    readonly audioCodecs?: readonly string[];
-    readonly videoCodecs?: readonly string[];
-}
-
-export interface MpegTsPlaybackErrorInput {
-    readonly type?: string;
-    readonly details?: string;
-    readonly message?: string;
-    readonly info?: unknown;
-}
-
-export interface PlaybackDiagnostic {
-    readonly code: PlaybackDiagnosticCode;
-    readonly source: PlaybackDiagnosticSource;
-    readonly sourceUrl: string;
-    readonly container: string;
-    readonly mimeType?: string;
-    readonly player?: InlinePlaybackPlayer;
-    readonly audioCodecs: readonly string[];
-    readonly videoCodecs: readonly string[];
-    readonly details?: string;
-    readonly nativeErrorCode?: number;
-    readonly nativeErrorMessage?: string;
-    readonly externalFallbackRecommended: boolean;
-}
-
-export interface PlaybackFallbackRequest {
-    readonly player: ExternalPlayerName;
-    readonly playback: ResolvedPortalPlayback;
-    readonly diagnostic: PlaybackDiagnostic;
-}
-
-const UNSUPPORTED_CONTAINER_EXTENSIONS = new Set([
-    'avi',
-    'asf',
-    'divx',
-    'flv',
-    'm2ts',
-    'm4v',
-    'mkv',
-    'mov',
-    'mpeg',
-    'mpg',
-    'rm',
-    'rmvb',
-    'ts',
-    'vob',
-    'wmv',
-]);
-
-const UNSUPPORTED_CONTAINER_NAMES = new Set([
-    ...UNSUPPORTED_CONTAINER_EXTENSIONS,
-    'matroska',
-    'quicktime',
-    'x-matroska',
-    'x-msvideo',
-]);
-
-const EXPLICIT_MEDIA_EXTENSION_QUERY_KEYS = ['extension', 'ext'];
-
-const DECLARED_MEDIA_FORMAT_QUERY_KEYS = ['format', 'container'];
-
-const DECLARED_MEDIA_EXTENSION_ALIASES = new Map([
-    ['hls', 'm3u8'],
-    ['mpegts', 'ts'],
-    ['mpeg-ts', 'ts'],
-]);
-
-const DECLARED_MEDIA_EXTENSIONS = new Set([
-    ...UNSUPPORTED_CONTAINER_EXTENSIONS,
-    'aac',
-    'flac',
-    'm3u',
-    'm3u8',
-    'm4s',
-    'mp3',
-    'mp4',
-    'mpd',
-    'oga',
-    'ogg',
-    'ogv',
-    'webm',
-]);
-
-const NON_MEDIA_URL_EXTENSIONS = new Set([
-    'asp',
-    'aspx',
-    'cgi',
-    'jsp',
-    'mpv',
-    'php',
-    'pl',
-]);
+export * from './playback-diagnostics.model';
+export {
+    createPlaybackSourceMetadata,
+    getLikelyBrowserUnsupportedCodecLabels,
+    getPlaybackMediaExtensionFromUrl,
+} from './playback-media-source.util';
 
 const SOURCE_NOT_SUPPORTED_CODE = 4;
 const DECODE_ERROR_CODE = 3;
 const NETWORK_ERROR_CODE = 2;
 
-const BROWSER_LIMITED_CODEC_PATTERNS: ReadonlyArray<{
-    readonly label: string;
-    readonly pattern: RegExp;
-}> = [
-    { label: 'HEVC', pattern: /^(hev1|hvc1|hevc|h265)/ },
-    { label: 'AC-3', pattern: /^(ac-?3|dac3)$/ },
-    { label: 'E-AC-3', pattern: /^(ec-?3|eac-?3|dec3)$/ },
-    { label: 'DTS', pattern: /^(dts|dtsc|dtse|dtsh|dtsl)/ },
-    { label: 'MPEG-2 Video', pattern: /^(mp2v|mpeg2video)/ },
-];
-
-export function createPlaybackSourceMetadata(
-    input: PlaybackSourceMetadataInput
-): PlaybackSourceMetadata {
-    const extension = getPlaybackMediaExtensionFromUrl(input.url);
-    const mimeType = input.mimeType?.trim() || undefined;
-
-    return {
-        url: input.url,
-        extension,
-        container: extension || inferContainerFromMimeType(mimeType),
-        mimeType,
-        player: input.player,
-        audioCodecs: normalizeCodecs(input.audioCodecs),
-        videoCodecs: normalizeCodecs(input.videoCodecs),
-    };
-}
-
-export function getPlaybackMediaExtensionFromUrl(url: string): string {
-    const explicitQueryExtension = getMediaExtensionFromQuery(
-        url,
-        EXPLICIT_MEDIA_EXTENSION_QUERY_KEYS
-    );
-    if (explicitQueryExtension) {
-        return explicitQueryExtension;
-    }
-
-    const pathExtension = normalizeExtensionToken(getExtensionFromUrl(url));
-    if (DECLARED_MEDIA_EXTENSIONS.has(pathExtension)) {
-        return pathExtension;
-    }
-
-    const formatQueryExtension = getMediaExtensionFromQuery(
-        url,
-        DECLARED_MEDIA_FORMAT_QUERY_KEYS
-    );
-    if (formatQueryExtension) {
-        return formatQueryExtension;
-    }
-
-    if (NON_MEDIA_URL_EXTENSIONS.has(pathExtension)) {
-        return '';
-    }
-
-    return pathExtension;
-}
-
-export function getLikelyBrowserUnsupportedCodecLabels(
-    metadata: Pick<PlaybackSourceMetadata, 'audioCodecs' | 'videoCodecs'>
-): string[] {
-    const codecs = [...metadata.videoCodecs, ...metadata.audioCodecs].map(
-        normalizeToken
-    );
-
-    return BROWSER_LIMITED_CODEC_PATTERNS.filter(({ pattern }) =>
-        codecs.some((codec) => pattern.test(codec))
-    ).map(({ label }) => label);
-}
-
 export function classifyNativePlaybackIssue(
     error: NativePlaybackErrorInput | MediaError | null | undefined,
     metadata: PlaybackSourceMetadata
@@ -246,9 +46,9 @@ export function classifyNativePlaybackIssue(
         // concrete CORS/mixed-content/CSP-style message.
         return createDiagnostic({
             code: isBrowserAccessFailure(lowerNativeErrorMessage)
-                ? PlaybackDiagnosticCode.BrowserAccessError
-                : PlaybackDiagnosticCode.NetworkError,
-            source: PlaybackDiagnosticSource.Native,
+                ? DiagnosticCode.BrowserAccessError
+                : DiagnosticCode.NetworkError,
+            source: DiagnosticSource.Native,
             metadata,
             nativeErrorCode,
             nativeErrorMessage,
@@ -257,8 +57,8 @@ export function classifyNativePlaybackIssue(
 
     if (nativeErrorCode === DECODE_ERROR_CODE) {
         return createDiagnostic({
-            code: PlaybackDiagnosticCode.MediaDecodeError,
-            source: PlaybackDiagnosticSource.Native,
+            code: DiagnosticCode.MediaDecodeError,
+            source: DiagnosticSource.Native,
             metadata,
             nativeErrorCode,
             nativeErrorMessage,
@@ -268,9 +68,9 @@ export function classifyNativePlaybackIssue(
     if (nativeErrorCode === SOURCE_NOT_SUPPORTED_CODE) {
         return createDiagnostic({
             code: isLikelyContainerIssue(metadata)
-                ? PlaybackDiagnosticCode.UnsupportedContainer
-                : PlaybackDiagnosticCode.UnsupportedCodec,
-            source: PlaybackDiagnosticSource.Native,
+                ? DiagnosticCode.UnsupportedContainer
+                : DiagnosticCode.UnsupportedCodec,
+            source: DiagnosticSource.Native,
             metadata,
             nativeErrorCode,
             nativeErrorMessage,
@@ -278,8 +78,8 @@ export function classifyNativePlaybackIssue(
     }
 
     return createDiagnostic({
-        code: PlaybackDiagnosticCode.UnknownPlaybackError,
-        source: PlaybackDiagnosticSource.Native,
+        code: DiagnosticCode.UnknownPlaybackError,
+        source: DiagnosticSource.Native,
         metadata,
         nativeErrorCode,
         nativeErrorMessage,
@@ -301,9 +101,9 @@ export function classifyHlsPlaybackIssue(
     if (isNetworkFailure(lowerType, lowerDetails)) {
         return createDiagnostic({
             code: isBrowserAccessFailure(lowerDetails)
-                ? PlaybackDiagnosticCode.BrowserAccessError
-                : PlaybackDiagnosticCode.NetworkError,
-            source: PlaybackDiagnosticSource.Hls,
+                ? DiagnosticCode.BrowserAccessError
+                : DiagnosticCode.NetworkError,
+            source: DiagnosticSource.Hls,
             metadata: mergedMetadata,
             details,
         });
@@ -311,8 +111,8 @@ export function classifyHlsPlaybackIssue(
 
     if (isDrmOrEncryptionFailure(lowerDetails)) {
         return createDiagnostic({
-            code: PlaybackDiagnosticCode.DrmOrEncryption,
-            source: PlaybackDiagnosticSource.Hls,
+            code: DiagnosticCode.DrmOrEncryption,
+            source: DiagnosticSource.Hls,
             metadata: mergedMetadata,
             details,
         });
@@ -320,8 +120,8 @@ export function classifyHlsPlaybackIssue(
 
     if (isCodecFailure(lowerDetails)) {
         return createDiagnostic({
-            code: PlaybackDiagnosticCode.UnsupportedCodec,
-            source: PlaybackDiagnosticSource.Hls,
+            code: DiagnosticCode.UnsupportedCodec,
+            source: DiagnosticSource.Hls,
             metadata: mergedMetadata,
             details,
         });
@@ -329,16 +129,16 @@ export function classifyHlsPlaybackIssue(
 
     if (lowerType.includes('media') || lowerType.includes('mux')) {
         return createDiagnostic({
-            code: PlaybackDiagnosticCode.MediaDecodeError,
-            source: PlaybackDiagnosticSource.Hls,
+            code: DiagnosticCode.MediaDecodeError,
+            source: DiagnosticSource.Hls,
             metadata: mergedMetadata,
             details,
         });
     }
 
     return createDiagnostic({
-        code: PlaybackDiagnosticCode.UnknownPlaybackError,
-        source: PlaybackDiagnosticSource.Hls,
+        code: DiagnosticCode.UnknownPlaybackError,
+        source: DiagnosticSource.Hls,
         metadata: mergedMetadata,
         details,
     });
@@ -355,9 +155,9 @@ export function classifyMpegTsPlaybackIssue(
     if (isNetworkFailure(lowerType, lowerDetails)) {
         return createDiagnostic({
             code: isBrowserAccessFailure(lowerDetails)
-                ? PlaybackDiagnosticCode.BrowserAccessError
-                : PlaybackDiagnosticCode.NetworkError,
-            source: PlaybackDiagnosticSource.MpegTs,
+                ? DiagnosticCode.BrowserAccessError
+                : DiagnosticCode.NetworkError,
+            source: DiagnosticSource.MpegTs,
             metadata,
             details,
         });
@@ -365,8 +165,8 @@ export function classifyMpegTsPlaybackIssue(
 
     if (lowerDetails.includes('codec')) {
         return createDiagnostic({
-            code: PlaybackDiagnosticCode.UnsupportedCodec,
-            source: PlaybackDiagnosticSource.MpegTs,
+            code: DiagnosticCode.UnsupportedCodec,
+            source: DiagnosticSource.MpegTs,
             metadata,
             details,
         });
@@ -374,8 +174,8 @@ export function classifyMpegTsPlaybackIssue(
 
     if (lowerDetails.includes('format') || lowerDetails.includes('mse')) {
         return createDiagnostic({
-            code: PlaybackDiagnosticCode.UnsupportedContainer,
-            source: PlaybackDiagnosticSource.MpegTs,
+            code: DiagnosticCode.UnsupportedContainer,
+            source: DiagnosticSource.MpegTs,
             metadata,
             details,
         });
@@ -383,16 +183,16 @@ export function classifyMpegTsPlaybackIssue(
 
     if (lowerType.includes('media')) {
         return createDiagnostic({
-            code: PlaybackDiagnosticCode.MediaDecodeError,
-            source: PlaybackDiagnosticSource.MpegTs,
+            code: DiagnosticCode.MediaDecodeError,
+            source: DiagnosticSource.MpegTs,
             metadata,
             details,
         });
     }
 
     return createDiagnostic({
-        code: PlaybackDiagnosticCode.UnknownPlaybackError,
-        source: PlaybackDiagnosticSource.MpegTs,
+        code: DiagnosticCode.UnknownPlaybackError,
+        source: DiagnosticSource.MpegTs,
         metadata,
         details,
     });
@@ -413,8 +213,8 @@ export function classifyUnsupportedHlsManifestCodecs(
     }
 
     return createDiagnostic({
-        code: PlaybackDiagnosticCode.UnsupportedCodec,
-        source: PlaybackDiagnosticSource.Source,
+        code: DiagnosticCode.UnsupportedCodec,
+        source: DiagnosticSource.Source,
         metadata,
         details: mimeType,
     });
@@ -455,186 +255,11 @@ function createDiagnostic(options: {
 
 function isExternalFallbackRecommended(code: PlaybackDiagnosticCode): boolean {
     return (
-        code === PlaybackDiagnosticCode.UnsupportedContainer ||
-        code === PlaybackDiagnosticCode.UnsupportedCodec ||
-        code === PlaybackDiagnosticCode.MediaDecodeError ||
-        code === PlaybackDiagnosticCode.BrowserAccessError ||
-        code === PlaybackDiagnosticCode.DrmOrEncryption
-    );
-}
-
-function mergeCodecMetadata(
-    metadata: PlaybackSourceMetadata,
-    codecs: Pick<PlaybackSourceMetadataInput, 'audioCodecs' | 'videoCodecs'>
-): PlaybackSourceMetadata {
-    const audioCodecs = normalizeCodecs([
-        ...metadata.audioCodecs,
-        ...(codecs.audioCodecs ?? []),
-    ]);
-    const videoCodecs = normalizeCodecs([
-        ...metadata.videoCodecs,
-        ...(codecs.videoCodecs ?? []),
-    ]);
-
-    return {
-        ...metadata,
-        audioCodecs,
-        videoCodecs,
-    };
-}
-
-function normalizeCodecs(codecs: readonly string[] | undefined): string[] {
-    return Array.from(
-        new Set(
-            (codecs ?? [])
-                .map((codec) => codec.trim())
-                .filter((codec) => codec.length > 0)
-        )
-    );
-}
-
-function normalizeToken(value: string | undefined): string {
-    return value?.trim().toLowerCase() ?? '';
-}
-
-function normalizeExtensionToken(value: string | undefined): string {
-    return normalizeToken(value).replace(/^\.+/, '');
-}
-
-function getMediaExtensionFromQuery(
-    url: string,
-    queryKeys: readonly string[]
-): string {
-    try {
-        const parsedUrl = new URL(url, 'http://iptvnator.local');
-        for (const key of queryKeys) {
-            const declaredExtension = normalizeDeclaredMediaExtension(
-                parsedUrl.searchParams.get(key) ?? undefined
-            );
-            if (declaredExtension) {
-                return declaredExtension;
-            }
-        }
-
-        return '';
-    } catch {
-        return '';
-    }
-}
-
-function normalizeDeclaredMediaExtension(value: string | undefined): string {
-    const extension = normalizeExtensionToken(value);
-    const normalized =
-        DECLARED_MEDIA_EXTENSION_ALIASES.get(extension) ?? extension;
-
-    if (!normalized || NON_MEDIA_URL_EXTENSIONS.has(normalized)) {
-        return '';
-    }
-
-    return DECLARED_MEDIA_EXTENSIONS.has(normalized) ? normalized : '';
-}
-
-function inferContainerFromMimeType(mimeType: string | undefined): string {
-    if (!mimeType) {
-        return '';
-    }
-
-    const subtype = mimeType.split(';')[0]?.split('/')[1] ?? '';
-    return subtype.toLowerCase();
-}
-
-function isLikelyContainerIssue(metadata: PlaybackSourceMetadata): boolean {
-    return (
-        UNSUPPORTED_CONTAINER_NAMES.has(metadata.extension) ||
-        UNSUPPORTED_CONTAINER_NAMES.has(metadata.container) ||
-        metadata.mimeType === 'video/matroska'
-    );
-}
-
-function normalizeErrorDetails(
-    error: HlsPlaybackErrorInput | MpegTsPlaybackErrorInput
-): string {
-    const hlsError = 'error' in error ? error.error : undefined;
-    const mpegTsInfo = 'info' in error ? error.info : undefined;
-    const errorMessage = normalizeErrorPayload(hlsError);
-    const info = normalizeErrorPayload(mpegTsInfo);
-
-    return [error.details, error.message, errorMessage, info]
-        .filter((part): part is string => Boolean(part))
-        .join(' ');
-}
-
-function normalizeErrorPayload(payload: unknown): string {
-    if (!payload) {
-        return '';
-    }
-
-    if (typeof payload === 'string') {
-        return payload;
-    }
-
-    if (payload instanceof Error) {
-        const extraDetails = stringifyUnknown(payload);
-        return [payload.message, extraDetails === '{}' ? '' : extraDetails]
-            .filter(Boolean)
-            .join(' ');
-    }
-
-    return stringifyUnknown(payload);
-}
-
-function stringifyUnknown(value: unknown): string {
-    try {
-        return JSON.stringify(value) || '';
-    } catch {
-        return String(value);
-    }
-}
-
-function isNetworkFailure(type: string, details: string): boolean {
-    return (
-        type.includes('network') ||
-        details.includes('network') ||
-        details.includes('loaderror') ||
-        details.includes('timeout') ||
-        details.includes('status')
-    );
-}
-
-function isBrowserAccessFailure(details: string): boolean {
-    return (
-        details.includes('cors') ||
-        details.includes('cross-origin') ||
-        details.includes('cross origin') ||
-        details.includes('access-control') ||
-        details.includes('access control') ||
-        details.includes('content security policy') ||
-        details.includes('mixed content') ||
-        details.includes('private network access') ||
-        details.includes('blocked by content security') ||
-        details.includes('blocked by cors') ||
-        details.includes('blocked by mixed content') ||
-        details.includes('not allowed to load local resource') ||
-        details.includes('err_blocked') ||
-        details.includes('err_cleartext')
-    );
-}
-
-function isCodecFailure(details: string): boolean {
-    return (
-        details.includes('codec') ||
-        details.includes('incompatiblecodecs') ||
-        details.includes('addcodec')
-    );
-}
-
-function isDrmOrEncryptionFailure(details: string): boolean {
-    return (
-        details.includes('decrypt') ||
-        details.includes('keysystem') ||
-        details.includes('keyload') ||
-        details.includes('license') ||
-        details.includes('drm')
+        code === DiagnosticCode.UnsupportedContainer ||
+        code === DiagnosticCode.UnsupportedCodec ||
+        code === DiagnosticCode.MediaDecodeError ||
+        code === DiagnosticCode.BrowserAccessError ||
+        code === DiagnosticCode.DrmOrEncryption
     );
 }
 
diff --git a/libs/ui/playback/src/lib/playback-diagnostics/playback-error-patterns.util.ts b/libs/ui/playback/src/lib/playback-diagnostics/playback-error-patterns.util.ts
new file mode 100644
index 000000000..9044469b0
--- /dev/null
+++ b/libs/ui/playback/src/lib/playback-diagnostics/playback-error-patterns.util.ts
@@ -0,0 +1,91 @@
+import type {
+    HlsPlaybackErrorInput,
+    MpegTsPlaybackErrorInput,
+} from './playback-diagnostics.model';
+
+export function normalizeErrorDetails(
+    error: HlsPlaybackErrorInput | MpegTsPlaybackErrorInput
+): string {
+    const hlsError = 'error' in error ? error.error : undefined;
+    const mpegTsInfo = 'info' in error ? error.info : undefined;
+    const errorMessage = normalizeErrorPayload(hlsError);
+    const info = normalizeErrorPayload(mpegTsInfo);
+
+    return [error.details, error.message, errorMessage, info]
+        .filter((part): part is string => Boolean(part))
+        .join(' ');
+}
+
+export function isNetworkFailure(type: string, details: string): boolean {
+    return (
+        type.includes('network') ||
+        details.includes('network') ||
+        details.includes('loaderror') ||
+        details.includes('timeout') ||
+        details.includes('status')
+    );
+}
+
+export function isBrowserAccessFailure(details: string): boolean {
+    return (
+        details.includes('cors') ||
+        details.includes('cross-origin') ||
+        details.includes('cross origin') ||
+        details.includes('access-control') ||
+        details.includes('access control') ||
+        details.includes('content security policy') ||
+        details.includes('mixed content') ||
+        details.includes('private network access') ||
+        details.includes('blocked by content security') ||
+        details.includes('blocked by cors') ||
+        details.includes('blocked by mixed content') ||
+        details.includes('not allowed to load local resource') ||
+        details.includes('err_blocked') ||
+        details.includes('err_cleartext')
+    );
+}
+
+export function isCodecFailure(details: string): boolean {
+    return (
+        details.includes('codec') ||
+        details.includes('incompatiblecodecs') ||
+        details.includes('addcodec')
+    );
+}
+
+export function isDrmOrEncryptionFailure(details: string): boolean {
+    return (
+        details.includes('decrypt') ||
+        details.includes('keysystem') ||
+        details.includes('keyload') ||
+        details.includes('license') ||
+        details.includes('drm')
+    );
+}
+
+function normalizeErrorPayload(payload: unknown): string {
+    if (!payload) {
+        return '';
+    }
+
+    if (typeof payload === 'string') {
+        return payload;
+    }
+
+    if (payload instanceof Error) {
+        const extraDetails = stringifyUnknown(payload);
+        return [payload.message, extraDetails === '{}' ? '' : extraDetails]
+            .filter(Boolean)
+            .join(' ');
+    }
+
+    return stringifyUnknown(payload);
+}
+
+function stringifyUnknown(value: unknown): string {
+    try {
+        return JSON.stringify(value) || '';
+    } catch {
+        return String(value);
+    }
+}
diff --git a/libs/ui/playback/src/lib/playback-diagnostics/playback-media-source.util.ts b/libs/ui/playback/src/lib/playback-diagnostics/playback-media-source.util.ts
new file mode 100644
index 000000000..3915ac822
--- /dev/null
+++ b/libs/ui/playback/src/lib/playback-diagnostics/playback-media-source.util.ts
@@ -0,0 +1,227 @@
+import { getExtensionFromUrl } from 'm3u-utils';
+
+import type {
+    PlaybackSourceMetadata,
+    PlaybackSourceMetadataInput,
+} from './playback-diagnostics.model';
+
+const UNSUPPORTED_CONTAINER_EXTENSIONS = new Set([
+    'avi',
+    'asf',
+    'divx',
+    'flv',
+    'm2ts',
+    'm4v',
+    'mkv',
+    'mov',
+    'mpeg',
+    'mpg',
+    'rm',
+    'rmvb',
+    'ts',
+    'vob',
+    'wmv',
+]);
+
+const UNSUPPORTED_CONTAINER_NAMES = new Set([
+    ...UNSUPPORTED_CONTAINER_EXTENSIONS,
+    'matroska',
+    'quicktime',
+    'x-matroska',
+    'x-msvideo',
+]);
+
+const EXPLICIT_MEDIA_EXTENSION_QUERY_KEYS = ['extension', 'ext'];
+
+const DECLARED_MEDIA_FORMAT_QUERY_KEYS = ['format', 'container'];
+
+const DECLARED_MEDIA_EXTENSION_ALIASES = new Map([
+    ['hls', 'm3u8'],
+    ['mpegts', 'ts'],
+    ['mpeg-ts', 'ts'],
+]);
+
+const DECLARED_MEDIA_EXTENSIONS = new Set([
+    ...UNSUPPORTED_CONTAINER_EXTENSIONS,
+    'aac',
+    'flac',
+    'm3u',
+    'm3u8',
+    'm4s',
+    'mp3',
+    'mp4',
+    'mpd',
+    'oga',
+    'ogg',
+    'ogv',
+    'webm',
+]);
+
+const NON_MEDIA_URL_EXTENSIONS = new Set([
+    'asp',
+    'aspx',
+    'cgi',
+    'jsp',
+    'mpv',
+    'php',
+    'pl',
+]);
+
+const BROWSER_LIMITED_CODEC_PATTERNS: ReadonlyArray<{
+    readonly label: string;
+    readonly pattern: RegExp;
+}> = [
+    { label: 'HEVC', pattern: /^(hev1|hvc1|hevc|h265)/ },
+    { label: 'AC-3', pattern: /^(ac-?3|dac3)$/ },
+    { label: 'E-AC-3', pattern: /^(ec-?3|eac-?3|dec3)$/ },
+    { label: 'DTS', pattern: /^(dts|dtsc|dtse|dtsh|dtsl)/ },
+    { label: 'MPEG-2 Video', pattern: /^(mp2v|mpeg2video)/ },
+];
+
+export function createPlaybackSourceMetadata(
+    input: PlaybackSourceMetadataInput
+): PlaybackSourceMetadata {
+    const extension = getPlaybackMediaExtensionFromUrl(input.url);
+    const mimeType = input.mimeType?.trim() || undefined;
+
+    return {
+        url: input.url,
+        extension,
+        container: extension || inferContainerFromMimeType(mimeType),
+        mimeType,
+        player: input.player,
+        audioCodecs: normalizeCodecs(input.audioCodecs),
+        videoCodecs: normalizeCodecs(input.videoCodecs),
+    };
+}
+
+export function getPlaybackMediaExtensionFromUrl(url: string): string {
+    const explicitQueryExtension = getMediaExtensionFromQuery(
+        url,
+        EXPLICIT_MEDIA_EXTENSION_QUERY_KEYS
+    );
+    if (explicitQueryExtension) {
+        return explicitQueryExtension;
+    }
+
+    const pathExtension = normalizeExtensionToken(getExtensionFromUrl(url));
+    if (DECLARED_MEDIA_EXTENSIONS.has(pathExtension)) {
+        return pathExtension;
+    }
+
+    const formatQueryExtension = getMediaExtensionFromQuery(
+        url,
+        DECLARED_MEDIA_FORMAT_QUERY_KEYS
+    );
+    if (formatQueryExtension) {
+        return formatQueryExtension;
+    }
+
+    if (NON_MEDIA_URL_EXTENSIONS.has(pathExtension)) {
+        return '';
+    }
+
+    return pathExtension;
+}
+
+export function getLikelyBrowserUnsupportedCodecLabels(
+    metadata: Pick<PlaybackSourceMetadata, 'audioCodecs' | 'videoCodecs'>
+): string[] {
+    const codecs = [...metadata.videoCodecs, ...metadata.audioCodecs].map(
+        normalizeToken
+    );
+
+    return BROWSER_LIMITED_CODEC_PATTERNS.filter(({ pattern }) =>
+        codecs.some((codec) => pattern.test(codec))
+    ).map(({ label }) => label);
+}
+
+export function isLikelyContainerIssue(
+    metadata: PlaybackSourceMetadata
+): boolean {
+    return (
+        UNSUPPORTED_CONTAINER_NAMES.has(metadata.extension) ||
+        UNSUPPORTED_CONTAINER_NAMES.has(metadata.container) ||
+        metadata.mimeType === 'video/matroska'
+    );
+}
+
+export function mergeCodecMetadata(
+    metadata: PlaybackSourceMetadata,
+    codecs: Pick<PlaybackSourceMetadataInput, 'audioCodecs' | 'videoCodecs'>
+): PlaybackSourceMetadata {
+    const audioCodecs = normalizeCodecs([
+        ...metadata.audioCodecs,
+        ...(codecs.audioCodecs ?? []),
+    ]);
+    const videoCodecs = normalizeCodecs([
+        ...metadata.videoCodecs,
+        ...(codecs.videoCodecs ?? []),
+    ]);
+
+    return {
+        ...metadata,
+        audioCodecs,
+        videoCodecs,
+    };
+}
+
+function inferContainerFromMimeType(mimeType: string | undefined): string {
+    if (!mimeType) {
+        return '';
+    }
+
+    const subtype = mimeType.split(';')[0]?.split('/')[1] ?? '';
+    return subtype.toLowerCase();
+}
+
+function normalizeCodecs(codecs: readonly string[] | undefined): string[] {
+    return Array.from(
+        new Set(
+            (codecs ?? [])
+                .map((codec) => codec.trim())
+                .filter((codec) => codec.length > 0)
+        )
+    );
+}
+
+function normalizeToken(value: string | undefined): string {
+    return value?.trim().toLowerCase() ?? '';
+}
+
+function normalizeExtensionToken(value: string | undefined): string {
+    return normalizeToken(value).replace(/^\.+/, '');
+}
+
+function getMediaExtensionFromQuery(
+    url: string,
+    queryKeys: readonly string[]
+): string {
+    try {
+        const parsedUrl = new URL(url, 'http://iptvnator.local');
+        for (const key of queryKeys) {
+            const declaredExtension = normalizeDeclaredMediaExtension(
+                parsedUrl.searchParams.get(key) ?? undefined
+            );
+            if (declaredExtension) {
+                return declaredExtension;
+            }
+        }
+
+        return '';
+    } catch {
+        return '';
+    }
+}
+
+function normalizeDeclaredMediaExtension(value: string | undefined): string {
+    const extension = normalizeExtensionToken(value);
+    const normalized =
+        DECLARED_MEDIA_EXTENSION_ALIASES.get(extension) ?? extension;
+
+    if (!normalized || NON_MEDIA_URL_EXTENSIONS.has(normalized)) {
+        return '';
+    }
+
+    return DECLARED_MEDIA_EXTENSIONS.has(normalized) ? normalized : '';
+}