diff --git a/app/static/public/js/video.js b/app/static/public/js/video.js
index 6e5c561..2f434e7 100644
--- a/app/static/public/js/video.js
+++ b/app/static/public/js/video.js
@@ -1899,7 +1899,7 @@
         for (const ms of candidates) {
           const seconds = (ms / 1000).toFixed(3);
           try {
-            await ffmpegExec(ff, ['-y', '-ss', seconds, '-i', inputName, '-frames:v', '1', frameName]);
+            await ffmpegExec(ff, ['-y', '-ss', seconds, '-i', inputName, '-frames:v', '1', '-update', '1', frameName]);
             frameBytes = await ffmpegReadFile(ff, frameName);
             lockedTimestampMs = ms;
             break;
@@ -1971,12 +1971,13 @@
               '-i', segASource,
               '-i', segBSource,
               '-filter_complex',
-              `[0:v]trim=end=${trimSeconds},setpts=PTS-STARTPTS[v0];[1:v]setpts=PTS-STARTPTS[v1];[v0][v1]concat=n=2:v=1:a=0[v];[0:a]atrim=end=${trimSeconds},asetpts=PTS-STARTPTS[a0]`,
+              `[0:v]trim=end=${trimSeconds},setpts=PTS-STARTPTS[v0];[1:v]setpts=PTS-STARTPTS[v1];[v0][v1]concat=n=2:v=1:a=0[v]`,
               '-map', '[v]',
               '-c:v', 'libx264',
               '-preset', 'ultrafast',
               '-pix_fmt', 'yuv420p',
               '-r', '30',
+              '-an',
               mergedVideoFile
             ]
           );
diff --git a/app/static/public/pages/video.html b/app/static/public/pages/video.html
index 261f3df..51f108a 100644
--- a/app/static/public/pages/video.html
+++ b/app/static/public/pages/video.html
@@ -318,7 +318,7 @@
   <script src="/static/common/js/pwa.js?v=0.1.1"></script>
   <script src="/static/vendor/ffmpeg/ffmpeg.js?v=0.1.0"></script>
   <script src="/static/vendor/ffmpeg/ffmpeg-util.js?v=0.1.0"></script>
-  <script src="/static/public/js/video.js?v=0.5.35"></script>
+  <script src="/static/public/js/video.js?v=0.5.36"></script>
 </body>
 
 </html>