1 files changed, 48 insertions, 1 deletions
diff --git a/packages/backend/src/core/FileInfoService.ts b/packages/backend/src/core/FileInfoService.ts
index b8babcb3a7..169285f033 100644
--- a/packages/backend/src/core/FileInfoService.ts
+++ b/packages/backend/src/core/FileInfoService.ts
@@ -14,11 +14,12 @@ import FFmpeg from 'fluent-ffmpeg';
 import isSvg from 'is-svg';
 import probeImageSize from 'probe-image-size';
 import { type predictionType } from 'nsfwjs';
-import sharp from 'sharp';
 import { sharpBmp } from '@misskey-dev/sharp-read-bmp';
 import { encode } from 'blurhash';
 import { createTempDir } from '@/misc/create-temp.js';
 import { AiService } from '@/core/AiService.js';
+import { LoggerService } from '@/core/LoggerService.js';
+import type Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
 
 export type FileInfo = {
@@ -49,9 +50,13 @@ const TYPE_SVG = {
 
 @Injectable()
 export class FileInfoService {
+	private logger: Logger;
+
 	constructor(
 		private aiService: AiService,
+		private loggerService: LoggerService,
 	) {
+		this.logger = this.loggerService.getLogger('file-info');
 	}
 
 	/**
@@ -318,6 +323,34 @@ export class FileInfoService {
 	}
 
 	/**
+	 * ビデオファイルにビデオトラックがあるかどうかチェック
+	 * （ない場合：m4a, webmなど）
+	 *
+	 * @param path ファイルパス
+	 * @returns ビデオトラックがあるかどうか（エラー発生時は常に`true`を返す）
+	 */
+	@bindThis
+	private hasVideoTrackOnVideoFile(path: string): Promise<boolean> {
+		const sublogger = this.logger.createSubLogger('ffprobe');
+		sublogger.info(`Checking the video file. File path: ${path}`);
+		return new Promise((resolve) => {
+			try {
+				FFmpeg.ffprobe(path, (err, metadata) => {
+					if (err) {
+						sublogger.warn(`Could not check the video file. Returns true. File path: ${path}`, err);
+						resolve(true);
+						return;
+					}
+					resolve(metadata.streams.some((stream) => stream.codec_type === 'video'));
+				});
+			} catch (err) {
+				sublogger.warn(`Could not check the video file. Returns true. File path: ${path}`, err as Error);
+				resolve(true);
+			}
+		});
+	}
+
+	/**
 	 * Detect MIME Type and extension
 	 */
 	@bindThis
@@ -339,6 +372,20 @@ export class FileInfoService {
 				return TYPE_SVG;
 			}
 
+			if ((type.mime.startsWith('video') || type.mime === 'application/ogg') && !(await this.hasVideoTrackOnVideoFile(path))) {
+				const newMime = `audio/${type.mime.split('/')[1]}`;
+				if (newMime === 'audio/mp4') {
+					return {
+						mime: 'audio/mp4',
+						ext: 'm4a',
+					};
+				}
+				return {
+					mime: newMime,
+					ext: type.ext,
+				};
+			}
+
 			return {
 				mime: this.fixMime(type.mime),
 				ext: type.ext,