Processing .mp4 file generates a black screen video with audio. rs#79

meganz · Jul 27, 2018 · d9b78e1 · d9b78e1
1 parent af4728e
commit d9b78e1
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/SDAVAssetExportSession.m b/SDAVAssetExportSession.m
@@ -309,6 +309,14 @@ - (AVMutableVideoComposition *)buildDefaultVideoComposition
 	CGSize targetSize = CGSizeMake([self.videoSettings[AVVideoWidthKey] floatValue], [self.videoSettings[AVVideoHeightKey] floatValue]);
 	CGSize naturalSize = [videoTrack naturalSize];
 	CGAffineTransform transform = videoTrack.preferredTransform;
+
+    CGRect rect = {{0, 0}, naturalSize};
+    CGRect transformedRect = CGRectApplyAffineTransform(rect, transform);
+    // transformedRect should have origin at 0 if correct; otherwise add offset to correct it
+    transform.tx -= transformedRect.origin.x;
+    transform.ty -= transformedRect.origin.y;
+
+
 	// Workaround radar 31928389, see https://github.com/rs/SDAVAssetExportSession/pull/70 for more info
 	if (transform.ty == -560) {
 		transform.ty = 0;