iOS record video first frame is black

Question

I'm made a record video app, but the first frame always be black.

I use:

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection 

and assetWriter to write sample buffer.

I found that the first sample buffer is mediaType:'soun', does it is the problem.

How should I do

Answer 1

I had the same problem. And I think first sample buffer being "sound" should be the problem. What I tried to do is to ignore the first sample buffer if it's sound. Wait until the first "video" sample buffer comes in and then do the AVAssetWriter startWriting thing. I solved my problem by doing this.