Improve generated image quality

packages/ffmpeg/src/ffmpeg-images.ts

@@ -42,6 +42,10 @@ export class FFmpegImage {
     fromPath: string
     output: string
     framesToAnalyze: number
+    scale?: {
+      width: number
+      height: number
+    }
     ffprobe?: FfprobeData
   }) {
     const { fromPath, ffprobe } = options
@@ -69,14 +73,25 @@ export class FFmpegImage {
     fromPath: string
     output: string
     framesToAnalyze: number
+    scale?: {
+      width: number
+      height: number
+    }
   }) {
-    const { fromPath, output, framesToAnalyze } = options
+    const { fromPath, output, framesToAnalyze, scale } = options
 
-    return this.commandWrapper.buildCommand(fromPath)
+    const command = this.commandWrapper.buildCommand(fromPath)
       .videoFilter('thumbnail=' + framesToAnalyze)
       .outputOption('-frames:v 1')
+      .outputOption('-q:v 5')
       .outputOption('-abort_on empty_output')
       .output(output)
+
+    if (scale) {
+      command.videoFilter(`scale=${scale.width}x${scale.height}:force_original_aspect_ratio=decrease`)
+    }
+
+    return command
   }
 
   // ---------------------------------------------------------------------------

server/core/lib/thumbnail.ts

@@ -380,7 +380,7 @@ async function generateImageFromVideoFile (options: {
 
   try {
     const framesToAnalyze = CONFIG.THUMBNAILS.GENERATION_FROM_VIDEO.FRAMES_TO_ANALYZE
-    await generateThumbnailFromVideo({ fromPath, output: pendingImagePath, framesToAnalyze, ffprobe })
+    await generateThumbnailFromVideo({ fromPath, output: pendingImagePath, framesToAnalyze, ffprobe, scale: size })
 
     const destination = join(folder, imageName)
     await processImageFromWorker({ path: pendingImagePath, destination, newSize: size })