trim silence option

downloader.js

@@ -23,7 +23,8 @@ var audioFormats = [
 expressManager.app.get("/download", async (req, res) => {
     var url = req.query.url,
         quality = req.query.quality,
-        format = req.query.format
+        format = req.query.format,
+        trimAudio = req.query.trimAudio && audioFormats.includes(format) || false
 
     if (ytdl.validateURL(url) && qualityLabels.includes(quality)) {
         var needsVideo = !audioFormats.includes(format)
@@ -83,12 +84,18 @@ expressManager.app.get("/download", async (req, res) => {
             '-map', '0:a'
         ]
 
+        var bonusArgs = []
+
         if (needsVideo) {
            inputArgs = inputArgs.concat(['-i', 'pipe:5'])
            mapArgs = mapArgs.concat(['-map', '1:v']) 
         }
 
-        var args = inputArgs.concat(mapArgs).concat(baseArgs)
+        if (trimAudio) {
+            bonusArgs = bonusArgs.concat(['-af', 'silenceremove=1:0:-50dB'])
+        }
+
+        var args = inputArgs.concat(mapArgs).concat(bonusArgs).concat(baseArgs)
 
         const ffmpegProcess = cp.spawn(ffmpeg, args, {
             windowsHide: true,