From f2ac570a97b5c935c7a47743f19291cb7e6e5e8a Mon Sep 17 00:00:00 2001
From: Mikael Finstad <finstaden@gmail.com>
Date: Mon, 23 May 2022 23:12:21 -0700
Subject: [PATCH] improve smart cut speed #126

---
 src/ffmpeg.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ffmpeg.js b/src/ffmpeg.js
index c46c895a..22abca9b 100644
--- a/src/ffmpeg.js
+++ b/src/ffmpeg.js
@@ -823,9 +823,9 @@ export async function cutEncodeSmartPart({ filePath, cutFrom, cutTo, outPath, ou
     // No progress if we set loglevel warning :(
     // '-loglevel', 'warning',
 
-    // cannot use -ss before -i here (will lead to issues)
+    '-ss', cutFrom.toFixed(5), // if we don't -ss before -i, seeking will be slow for long files, see https://github.com/mifi/lossless-cut/issues/126#issuecomment-1135451043
     '-i', filePath,
-    '-ss', cutFrom.toFixed(5),
+    '-ss', '0', // If we don't do this, the output seems to start with an empty black after merging with the encoded part
     '-t', (cutTo - cutFrom).toFixed(5),
 
     ...mapStreamsArgs,