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ios - AVAssetWriter 内存错误

转载 作者:行者123 更新时间:2023-11-28 19:01:31 25 4
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我有几种方法可以将 mov 文件中的视频写入临时目录,但在大约 15 秒后。我收到错误:

  • 收到内存警告。
  • 收到内存警告。
  • 收到内存警告。
  • 收到内存警告。

然后应用程序崩溃了。我被卡住了,不知道出了什么问题......

- (void) saveVideoToFileFromBuffer:(CMSampleBufferRef) buffer {


if (!movieWriter) {

NSString *moviePath = [NSString stringWithFormat:@"%@tmpMovie", NSTemporaryDirectory()];

if ([[NSFileManager defaultManager] fileExistsAtPath:moviePath])
[self removeMovieAtPath:moviePath];

NSError *error = nil;

movieWriter = [[AVAssetWriter alloc] initWithURL:[NSURL fileURLWithPath:moviePath] fileType: AVFileTypeQuickTimeMovie error:&error];
if (error) {

m_log(@"Error allocating AssetWriter: %@", [error localizedDescription]);

} else {

CMFormatDescriptionRef description = CMSampleBufferGetFormatDescription(buffer);

if(![self setUpMovieWriterObjectWithDescriptor:description])
m_log(@"ET go home, no video recording!!");
}

}

if (movieWriter.status != AVAssetWriterStatusWriting) {

[movieWriter startWriting];

[movieWriter startSessionAtSourceTime:kCMTimeZero];

apiStatusChangeIndicator = NO;

}

if (movieWriter.status == AVAssetWriterStatusWriting) {

if (![movieInput appendSampleBuffer:buffer]) m_log(@"Failed to append sample buffer!");

}


}

其余代码:

- (BOOL) setUpMovieWriterObjectWithDescriptor:(CMFormatDescriptionRef) descriptor {

CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions(descriptor);

NSDictionary *compressionSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoProfileLevelH264Baseline31,AVVideoProfileLevelKey,
[NSNumber numberWithInteger:30], AVVideoMaxKeyFrameIntervalKey, nil];
//AVVideoProfileLevelKey set because of errors


NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecH264, AVVideoCodecKey,[NSNumber numberWithInt:dimensions.width], AVVideoWidthKey,
[NSNumber numberWithInt:dimensions.height], AVVideoHeightKey, compressionSettings, AVVideoCompressionPropertiesKey, nil];


if ([movieWriter canApplyOutputSettings:videoSettings forMediaType:AVMediaTypeVideo]) {

movieInput = [[AVAssetWriterInput alloc] initWithMediaType:AVMediaTypeVideo outputSettings:videoSettings];
movieInput.expectsMediaDataInRealTime = YES;

if ([movieWriter canAddInput:movieInput]) {

[movieWriter addInput:movieInput];
} else {

m_log(@"Couldn't apply video input to Asset Writer!");

return NO;
}

} else {

m_log(@"Couldn't apply video settings to AVAssetWriter!");

return NO;
}



return YES;
}

如果有人能指出我的错误就太好了!如果需要,可以共享更多代码。 SampleBuffer 来自带有过滤器的 CIImage。

现在是新东西,我可以录制几秒钟的电影并保存它,但是全是黑屏...

更新

保存视频有效,但从 CIImage 创建 CMSampleBufferRef 失败。这是我出现绿屏或黑屏的原因,代码如下:

- (CMSampleBufferRef) processCIImageToPixelBuffer:(CIImage*) image andSampleBuffer:(CMSampleTimingInfo) info{

CVPixelBufferRef renderTargetPixelBuffer;

CFDictionaryRef empty;
CFMutableDictionaryRef attrs;

empty = CFDictionaryCreate(kCFAllocatorDefault,
NULL,
NULL,
0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);

attrs = CFDictionaryCreateMutable(kCFAllocatorDefault,
1,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);

CFDictionarySetValue(attrs,
kCVPixelBufferIOSurfacePropertiesKey,
empty);

CVReturn cvError = CVPixelBufferCreate(kCFAllocatorSystemDefault,
[image extent].size.width,
[image extent].size.height,
kCVPixelFormatType_420YpCbCr8BiPlanarFullRange,
attrs,
&renderTargetPixelBuffer);
if (cvError != 0) {

m_log(@"Error when init Pixel buffer: %i", cvError);

}

CFRelease(empty);
CFRelease(attrs);

CVPixelBufferLockBaseAddress(renderTargetPixelBuffer, 0 );

[_coreImageContext render:image toCVPixelBuffer:renderTargetPixelBuffer];

CVPixelBufferUnlockBaseAddress(renderTargetPixelBuffer, 0 );

CMVideoFormatDescriptionRef videoInfo = NULL;
CMVideoFormatDescriptionCreateForImageBuffer(kCFAllocatorDefault, renderTargetPixelBuffer, &videoInfo);

CMSampleBufferRef recordingBuffer;


OSStatus cmError = CMSampleBufferCreateForImageBuffer(kCFAllocatorDefault, renderTargetPixelBuffer, true, NULL, NULL, videoInfo, &info, &recordingBuffer);

if (cmError != 0 ) {

m_log(@"Error creating sample buffer: %i", (int)cmError);
}

CVPixelBufferRelease(renderTargetPixelBuffer);
renderTargetPixelBuffer = NULL;
CFRelease(videoInfo);
videoInfo = NULL;

return recordingBuffer;
}

最佳答案

您应该使用配置文件工具检查您的代码。特别是对于内存泄漏。可能是你没有释放样本缓冲区:

CMSampleBufferInvalidate(buffer);
CFRelease(buffer);
buffer = NULL;

关于ios - AVAssetWriter 内存错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24758715/

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