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GPUImageMovieWriter can't export audiomix audio tracks issue #1834
i use GPUImageMovieWriter output video with one audio track is ok ，then i try with two audio tracks export video is not ok。
_movieFile = [[GPUImageMovie alloc] initWithComposition:_editor.composition andVideoComposition:_editor.videoComposition andAudioMix:_editor.audioMix];
add this but GPUImageMovieWriter always can't write ,and self.assetWriter.status is AVAssetWriterStatusFailed .