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iOS: Some videos end up with black background and only audio #176

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iOS: Some videos end up with black background and only audio #176

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5 changes: 5 additions & 0 deletions src/ios/SDAVAssetExportSession.m
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Original file line number Diff line number Diff line change
Expand Up @@ -309,6 +309,11 @@ - (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;
CGFloat videoAngleInDegree = atan2(transform.b, transform.a) * 180 / M_PI;
if (videoAngleInDegree == 90 || videoAngleInDegree == -90) {
CGFloat width = naturalSize.width;
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