mux.js - npm Package Compare versions

Comparing version 1.4.0 to 1.4.1

lib/mp4/transmuxer.js

@@ -40,3 +40,3 @@ /**
 
-    if (track && track.channelcount === undefined) {
+    if (track) {
       track.audioobjecttype = data.audioobjecttype;
@@ -77,2 +77,3 @@ track.channelcount = data.channelcount;
           track.minSegmentDts = Math.min(track.minSegmentDts, currentFrame.dts);
+          track.minSegmentPts = track.minSegmentDts;
           return true;
@@ -117,2 +118,3 @@ }
     clearDtsInfo(track);
+
     this.trigger('data', {track: track, boxes: boxes});
@@ -137,2 +139,3 @@ this.trigger('done');
     pps;
+
   VideoSegmentStream.prototype.init.call(this);
@@ -297,3 +300,3 @@
 /**
- * Store information about the start and end of the tracka and the
+ * Store information about the start and end of the track and the
  * duration for each frame/sample we process in order to calculate
@@ -307,2 +310,14 @@ * the baseMediaDecodeTime
     }
+
+    if (track.minSegmentPts === undefined) {
+      track.minSegmentPts = data.pts;
+    } else {
+      track.minSegmentPts = Math.min(track.minSegmentPts, data.pts);
+    }
+
+    if (track.maxSegmentPts === undefined) {
+      track.maxSegmentPts = data.pts;
+    } else {
+      track.maxSegmentPts = Math.max(track.maxSegmentPts, data.pts);
+    }
   }
@@ -336,2 +351,4 @@
   delete track.maxSegmentDts;
+  delete track.minSegmentPts;
+  delete track.maxSegmentPts;
 };
@@ -347,6 +364,24 @@
     oneSecondInPTS = 90000, // 90kHz clock
-    scale;
+    scale,
+    // Calculate the distance, in time, that this segment starts from the start
+    // of the timeline (earliest time seen since the transmuxer initialized)
+    timeSinceStartOfTimeline = track.minSegmentDts - track.timelineStartInfo.dts,
+    // Calculate the first sample's effective compositionTimeOffset
+    firstSampleCompositionOffset = track.minSegmentPts - track.minSegmentDts;
 
-  track.baseMediaDecodeTime = track.minSegmentDts - track.timelineStartInfo.dts + track.timelineStartInfo.baseMediaDecodeTime;
+  // track.timelineStartInfo.baseMediaDecodeTime is the location, in time, where
+  // we want the start of the first segment to be placed
+  track.baseMediaDecodeTime = track.timelineStartInfo.baseMediaDecodeTime;
 
+  // Add to that the distance this segment is from the very first
+  track.baseMediaDecodeTime += timeSinceStartOfTimeline;
+
+  // Subtract this segment's "compositionTimeOffset" so that the first frame of
+  // this segment is displayed exactly at the `baseMediaDecodeTime` or at the
+  // end of the previous segment
+  track.baseMediaDecodeTime -= firstSampleCompositionOffset;
+
+  // baseMediaDecodeTime must not become negative
+  track.baseMediaDecodeTime = Math.max(0, track.baseMediaDecodeTime);
+
   if (track.type === 'audio') {
@@ -593,3 +628,2 @@ // Audio has a different clock equal to the sampling_rate so we need to
             audioTrack.timelineStartInfo = timelineStartInfo;
-
             // On the first segment we trim AAC frames that exist before the
@@ -596,0 +630,0 @@ // very earliest DTS we have seen in video because Chrome will

package.json

 {
   "name": "mux.js",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "description": "A collection of lightweight utilities for inspecting and manipulating video container formats.",
@@ -5,0 +5,0 @@ "repository": {

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Improved metrics

Total package byte prevSize

3553966

increased by0.1%

Lines of code

55960

increased by0.17%

No dependency changes