iOS录制视频第一帧是黑色的

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.

Answer 2

Thanks for the reply @ethanchli, it helped me, so I decided to add some details.

First, try uninstalling the AVCaptureAudioDataOutputSampleBufferDelegate extension if you are not using it, because it runs the same function with AVCaptureVideoDataOutputSampleBufferDelegate extension.

func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection){}

Or if you need audioSamleBoofer :)

Try this - Check orientation support which exist only in video connection.

    if connection.isVideoOrientationSupported {
        // Work with video samle boofer
    } else {
        // Work with audio sample boofer audio
    }