diff --git a/src/frame.js b/src/frame.js
index 280ee39..20ef7f6 100644
--- a/src/frame.js
+++ b/src/frame.js
@@ -81,7 +81,7 @@ function extractFramesFromTimeline(timeline, opts) {
 	const startTs = (opts.timeOrigin || events[0].ts) / 1000;
 	const endTs = events[events.length - 1].ts / 1000;
 
-	const rawScreenshots = events.filter(e => e.cat.includes(screenshotTraceCategory));
+	const rawScreenshots = events.filter(e => e.cat.includes(screenshotTraceCategory) && e.ts >= startTs * 1000);
 	const frames = rawScreenshots.map(function (evt) {
 		const base64img = evt.args && evt.args.snapshot;
 		const timestamp = evt.ts / 1000;
diff --git a/test/frame.js b/test/frame.js
index fc9e3fb..553ebc8 100644
--- a/test/frame.js
+++ b/test/frame.js
@@ -47,11 +47,13 @@ test('extract frames should support json', async t => {
 	const data = await frame.extractFramesFromTimeline(trace);
 	t.is(data.startTs, 103204916.772, 'data.startTs doesn\'t match expected value');
 	t.true(Array.isArray(data.frames), 'Frames is not an array');
+	t.is(data.frames.length, 7, 'Number of frames is incorrect');
 });
 
 test('extract frames from timeline supports options', async t => {
-	const data = await frame.extractFramesFromTimeline('./assets/progressive-app.json', {timeOrigin: 103205446186});
-	t.is(data.startTs, 103205446.186, 'data.startTs doesn\'t match supplied timeOrigin value');
+	const data = await frame.extractFramesFromTimeline('./assets/progressive-app.json', {timeOrigin: 103206183179});
+	t.is(data.startTs, 103206183.179, 'data.startTs doesn\'t match supplied timeOrigin value');
 	t.truthy(data.endTs, 'data.endTs doesn\'t exist');
 	t.true(Array.isArray(data.frames), 'Frames is not an array');
+	t.is(data.frames.length, 4, 'Frames were not filtered');
 });