From bded8b9e5a99f86c33a4b363c7b4016adb5575ea Mon Sep 17 00:00:00 2001
From: Mikael Finstad <finstaden@gmail.com>
Date: Thu, 24 Sep 2020 16:22:54 +0200
Subject: [PATCH] fix broken renderSingleFrame logic

---
 examples/renderSingleFrame.js | 2 +-
 index.js                      | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/examples/renderSingleFrame.js b/examples/renderSingleFrame.js
index 2e531b4..ba92e0e 100644
--- a/examples/renderSingleFrame.js
+++ b/examples/renderSingleFrame.js
@@ -8,4 +8,4 @@ const { renderSingleFrame } = require('..');
     time: 0,
     clips: JSON5.parse(await fs.readFile('./videos.json5', 'utf-8')).clips,
   });
-})().catch(console.error);
\ No newline at end of file
+})().catch(console.error);
diff --git a/index.js b/index.js
index 3edc69c..5d188fe 100644
--- a/index.js
+++ b/index.js
@@ -385,16 +385,16 @@ async function renderSingleFrame({
   outPath = `${Math.floor(Math.random() * 1e12)}.png`,
 }) {
   const clips = await parseConfig({ defaults, clips: clipsIn, allowRemoteRequests, ffprobePath });
-  let totalDuration = 0;
+  let clipStartTime = 0;
   const clip = clips.find((c) => {
-    if (totalDuration >= time) return true;
-    totalDuration += c.duration;
+    if (clipStartTime <= time && clipStartTime + c.duration > time) return true;
+    clipStartTime += c.duration;
     return false;
   });
   assert(clip, 'No clip found at requested time');
   const clipIndex = clips.indexOf(clip);
   const frameSource = await createFrameSource({ clip, clipIndex, width, height, channels, verbose, logTimes, ffmpegPath, ffprobePath, enableFfmpegLog, framerateStr: '1' });
-  const rgba = await frameSource.readNextFrame({ time });
+  const rgba = await frameSource.readNextFrame({ time: time - clipStartTime });
 
   // TODO converting rgba to png can be done more easily?
   const canvas = createFabricCanvas({ width, height });