我想将CG
Image转换为CMSampleBufferRef,并使用appendSampleBuffer:方法将其附加到AVAssetWriterInput.我设法使用以下代码获取CMSampleBufferRef,但是appendSampleBuffer:在提供生成的CMSampleBufferRef时,只需返回NO.我究竟做错了什么?
- (void) appendCGImage: (CGImageRef) frame { const int width = CGImageGetWidth(frame); const int height = CGImageGetHeight(frame); // Create a dummy pixel buffer to try the encoding // on something simple. CVPixelBufferRef pixelBuffer = NULL; CVReturn status = CVPixelBufferCreate(kcfAllocatorDefault,width,height,kCVPixelFormatType_32BGRA,NULL,&pixelBuffer); NSParameterassert(status == kCVReturnSuccess && pixelBuffer != NULL); // Sample timing info. CMTime frameTime = CMTimeMake(1,30); CMTime currentTime = CMTimeAdd(lastSampleTime,frameTime); CMSampleTimingInfo timing = {frameTime,currentTime,kCMTimeInvalid}; Osstatus result = 0; // Sample format. CMVideoFormatDescriptionRef videoInfo = NULL; result = CMVideoFormatDescriptionCreateForImageBuffer(NULL,pixelBuffer,&videoInfo); NSParameterassert(result == 0 && videoInfo != NULL); // Create sample buffer. CMSampleBufferRef sampleBuffer = NULL; result = CMSampleBufferCreateForImageBuffer(kcfAllocatorDefault,true,videoInfo,&timing,&sampleBuffer); NSParameterassert(result == 0 && sampleBuffer != NULL); // Ship out the frame. NSParameterassert(CMSampleBufferDataIsReady(sampleBuffer)); NSParameterassert([writerInput isReadyForMoreMediaData]); BOOL success = [writerInput appendSampleBuffer:frame]; NSParameterassert(success); // no go :( }
解决方法
阿哈,我完全错过了
AVAssetWriterInputPixelBufferAdaptor
课程,特别是将像素缓冲区配置为写入器输入.现在的代码工作,即使没有凌乱的CMSampleBuffer的东西.
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