I do it by using CMSampleBufferCreateForImageBuffer() .
OSStatus ret = 0;
CMSampleBufferRef sample = NULL;
CMVideoFormatDescriptionRef videoInfo = NULL;
CMSampleTimingInfo timingInfo = kCMTimingInfoInvalid;
timingInfo.presentationTimeStamp = pts;
timingInfo.duration = duration;
ret = CMVideoFormatDescriptionCreateForImageBuffer(NULL, pixel, &videoInfo);
if (ret != 0) {
NSLog(@"CMVideoFormatDescriptionCreateForImageBuffer failed! %d", (int)ret);
goto done;
}
ret = CMSampleBufferCreateForImageBuffer(kCFAllocatorDefault, pixel, true, NULL, NULL,
videoInfo, &timingInfo, &sample);
if (ret != 0) {
NSLog(@"CMSampleBufferCreateForImageBuffer failed! %d", (int)ret);
goto done;
}