本文介绍了如何使用AVAssetWriter将h264 strem写入视频?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我想将h.264流从服务器传输到视频文件，但是当我使用assetwrite.finishwrite时，XCode会报告

I want to make the h.264 stream from server to a video file, but when I used assetwrite.finishwrite, the XCode reports

Video /var/mobile/Applications/DE4196F1-BB77-4B7D-8C20-7A5D6223C64D/Documents/test.mov cannot be saved to the saved photos album: Error Domain=NSOSStatusErrorDomain Code=-12847 "This movie format is not supported." UserInfo=0x5334830 {NSLocalizedDescription=This movie format is not supported.}"

以下是我的代码:数据是h.264帧，只有一帧，可能是i帧或p.

Below is my code:data is the h.264 frame, just one frame, it might be i frame or p.

(void)_encodeVideoFrame2:(NSData *) data time:(double)tm
{
  CMBlockBufferRef videoBlockBuffer=NULL;
  CMFormatDescriptionRef videoFormat=NULL;
  CMSampleBufferRef videoSampleBuffer=NULL;
  CMItemCount numberOfSampleTimeEntries=1;
  CMItemCount numberOfSamples=1;
  CMVideoFormatDescriptionCreate(kCFAllocatorDefault, kCMVideoCodecType_H264, 320, 240, NULL, &videoFormat);
  OSStatus result;
  result=CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault, NULL, data.length, kCFAllocatorDefault, NULL, 0, data.length, kCMBlockBufferAssureMemoryNowFlag, &videoBlockBuffer);
  result=CMBlockBufferReplaceDataBytes(data.bytes, videoBlockBuffer, 0, data.length);
  CMSampleTimingInfo videoSampleTimingInformation={CMTimeMake(tm*600, 600)};
  size_t sampleSizeArray[1];
  sampleSizeArray[0]=data.length;
  result=CMSampleBufferCreate(kCFAllocatorDefault, videoBlockBuffer, TRUE, NULL, NULL, videoFormat, numberOfSamples, numberOfSampleTimeEntries, &videoSampleTimingInformation, 1, sampleSizeArray, &videoSampleBuffer);
  result = CMSampleBufferMakeDataReady(videoSampleBuffer);
  [assetWriterInput appendSampleBuffer:videoSampleBuffer];
}

也许CMSampleBufferCreate参数有误?谢谢.

尝试此代码

(IBAction)createVideo:(id)sender {

(IBAction)createVideo:(id)sender {

///////////// setup OR function def if we move this to a separate function ////////////// this should be moved to its own function, that can take an imageArray, videoOutputPath, etc...// - (void)exportImages:(NSMutableArray *)imageArray// asVideoToPath:(NSString *)videoOutputPath// withFrameSize:(CGSize)imageSize// framesPerSecond:(NSUInteger)fps {

NSError *error = nil;

// set up file manager, and file videoOutputPath, remove "test_output.mp4" if it exists...//NSString *videoOutputPath = @"/Users/someuser/Desktop/test_output.mp4";NSFileManager *fileMgr = [NSFileManager defaultManager];NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];NSString *videoOutputPath = [documentsDirectory stringByAppendingPathComponent:@"test_output.mp4"];//NSLog(@"-->videoOutputPath= %@", videoOutputPath);// get rid of existing mp4 if exists...if ([fileMgr removeItemAtPath:videoOutputPath error:&error] != YES) NSLog(@"Unable to delete file: %@", [error localizedDescription]);

CGSize imageSize = CGSizeMake(400, 200);NSUInteger fps = 30;

//NSMutableArray *imageArray;//imageArray = [[NSMutableArray alloc] initWithObjects:@"download.jpeg", @"download2.jpeg", nil];NSMutableArray imageArray;NSArray imagePaths = [[NSBundle mainBundle] pathsForResourcesOfType:@"jpg" inDirectory:nil];imageArray = [[NSMutableArray alloc] initWithCapacity:imagePaths.count];NSLog(@"-->imageArray.count= %i", imageArray.count);for (NSString* path in imagePaths){ [imageArray addObject:[UIImage imageWithContentsOfFile:path]]; //NSLog(@"-->image path= %@", path);}

////////////// end setup ///////////////////////////////////

NSLog(@"Start building video from defined frames.");

AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL: [NSURL fileURLWithPath:videoOutputPath] fileType:AVFileTypeQuickTimeMovie error:&error];NSParameterAssert(videoWriter);

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

AVAssetWriterInput* videoWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings];

AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput sourcePixelBufferAttributes:nil];

NSParameterAssert(videoWriterInput);NSParameterAssert([videoWriter canAddInput:videoWriterInput]);videoWriterInput.expectsMediaDataInRealTime = YES;[videoWriter addInput:videoWriterInput];

//Start a session:[videoWriter startWriting];[videoWriter startSessionAtSourceTime:kCMTimeZero];

CVPixelBufferRef buffer = NULL;

//convert uiimage to CGImage.int frameCount = 0;double numberOfSecondsPerFrame = 6;double frameDuration = fps * numberOfSecondsPerFrame;

//for(VideoFrame * frm in imageArray)NSLog(@"****************************");for(UIImage * img in imageArray){ //UIImage * img = frm._imageFrame; buffer = [self pixelBufferFromCGImage:[img CGImage]];

BOOL append_ok = NO;
int j = 0;
while (!append_ok && j < 30) {
    if (adaptor.assetWriterInput.readyForMoreMediaData)  {
        //print out status:
        NSLog(@"Processing video frame (%d,%d)",frameCount,[imageArray count]);

        CMTime frameTime = CMTimeMake(frameCount*frameDuration,(int32_t) fps);
        append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
        if(!append_ok){
            NSError *error = videoWriter.error;
            if(error!=nil) {
                NSLog(@"Unresolved error %@,%@.", error, [error userInfo]);
            }
        }
    }
    else {
        printf("adaptor not ready %d, %d\n", frameCount, j);
        [NSThread sleepForTimeInterval:0.1];
    }
    j++;
}
if (!append_ok) {
    printf("error appending image %d times %d\n, with error.", frameCount, j);
}
frameCount++;

}NSLog(@" * ** * ** * ** * ** * ** * ** * ** * ** * *** );

}NSLog(@"****************************");

//完成会话:[videoWriterInput markAsFinished];[videoWriter finishWriting];NSLog(@"Write Ended");

//Finish the session:[videoWriterInput markAsFinished];[videoWriter finishWriting];NSLog(@"Write Ended");

/////////////////////////////////////////////////////////////////////////////////////////////OK现在添加音频文件以移动文件//////////////////////AVMutableComposition * mixComposition = [AVMutableComposition组成];

////////////////////////////////////////////////////////////////////////////////////////// OK now add an audio file to move file /////////////////////AVMutableComposition* mixComposition = [AVMutableComposition composition];

NSString * bundleDirectory = [[NSBundle mainBundle] bundlePath];//音频输入文件...NSString * audio_inputFilePath = [bundleDirectory stringByAppendingPathComponent:@"30secs.mp3"];NSURL * audio_inputFileUrl = [NSURL fileURLWithPath:audio_inputFilePath];

NSString *bundleDirectory = [[NSBundle mainBundle] bundlePath];// audio input file...NSString *audio_inputFilePath = [bundleDirectory stringByAppendingPathComponent:@"30secs.mp3"];NSURL *audio_inputFileUrl = [NSURL fileURLWithPath:audio_inputFilePath];

//这是上面刚刚写的视频文件，文件的完整路径在-> videoOutputPath中NSURL * video_inputFileUrl = [NSURL fileURLWithPath:videoOutputPath];

// this is the video file that was just written above, full path to file is in --> videoOutputPathNSURL *video_inputFileUrl = [NSURL fileURLWithPath:videoOutputPath];

//将最终的视频输出文件创建为MOV文件-可能需要为MP4，但这到目前为止仍然有效...NSString * outputFilePath = [documentsDirectory stringByAppendingPathComponent:@"final_video.mp4"];NSURL * outputFileUrl = [NSURL fileURLWithPath:outputFilePath];

// create the final video output file as MOV file - may need to be MP4, but this works so far...NSString *outputFilePath = [documentsDirectory stringByAppendingPathComponent:@"final_video.mp4"];NSURL *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];

如果([[[NSFileManager defaultManager] fileExistsAtPath:outputFilePath]) [[NSFileManager defaultManager] removeItemAtPath:outputFilePath错误:无]；

if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath]) [[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];

CMTime nextClipStartTime = kCMTimeZero;

AVURLAsset * videoAsset = [[AVURLAsset alloc] initWithURL:video_inputFileUrl选项:无];CMTimeRange video_timeRange = CMTimeRangeMake(kCMTimeZero，videoAsset.duration);AVMutableCompositionTrack * a_compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];[a_compositionVideoTrack insertTimeRange:track的video_timeRange:[[videoAssettrackWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:nextClipStartTime错误:无]；

AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:video_inputFileUrl options:nil];CMTimeRange video_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);AVMutableCompositionTrack *a_compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];[a_compositionVideoTrack insertTimeRange:video_timeRange ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:nextClipStartTime error:nil];

//nextClipStartTime = CMTimeAdd(nextClipStartTime，a_timeRange.duration);

//nextClipStartTime = CMTimeAdd(nextClipStartTime, a_timeRange.duration);

AVURLAsset * audioAsset = [[AVURLAsset alloc] initWithURL:audio_inputFileUrl选项:无];CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero，audioAsset.duration);AVMutableCompositionTrack * b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];[b_compositionAudioTrack insertTimeRange:audio_timeRange of Track:[[audioAsset trackWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:nextClipStartTime错误:无]；

AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero, audioAsset.duration);AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];[b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:nextClipStartTime error:nil];

//AVAssetExportSession * _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition预设名称:AVAssetExportPresetHighestQuality];__block AVAssetExportSession * _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition预设名称:AVAssetExportPresetPassthrough];

//AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];__block AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetPassthrough];

NSLog(@支持文件类型=％@"，[_ assetExport支持的文件类型])；_assetExport.outputFileType = @"com.apple.quicktime-movie";NSLog(@支持文件类型=％@"，[_ assetExportsupportedFileTypes])；_assetExport.outputURL = outputFileUrl;

NSLog(@"support file types= %@", [_assetExport supportedFileTypes]);_assetExport.outputFileType = @"com.apple.quicktime-movie";NSLog(@"support file types= %@", [_assetExport supportedFileTypes]);_assetExport.outputURL = outputFileUrl;

[_ assetExport exportAsynchronouslyWithCompletionHandler:^ { 开关(_assetExport.status){ 情况AVAssetExportSessionStatusCompleted: //导入导出视频的自定义方法 NSLog(@"completed !!!"); 休息; 情况AVAssetExportSessionStatusFailed: // NSLog(@失败:％@"，_ assetExport.error); 休息; 情况AVAssetExportSessionStatusCancelled: // NSLog(@"Canceled:％@"，_ assetExport.error); 休息; 默认: 休息; }}];

[_assetExport exportAsynchronouslyWithCompletionHandler:^{ switch (_assetExport.status) { case AVAssetExportSessionStatusCompleted: // Custom method to import the Exported Video NSLog(@"completed!!!"); break; case AVAssetExportSessionStatusFailed: // NSLog(@"Failed:%@",_assetExport.error); break; case AVAssetExportSessionStatusCancelled: // NSLog(@"Canceled:%@",_assetExport.error); break; default: break; }}];

//////完成...最终的视频文件将写入此处...NSLog(@"DONE ..... outputFilePath --->％@"，outputFilePath);

///// THAT IS IT DONE... the final video file will be written here...NSLog(@"DONE.....outputFilePath--->%@", outputFilePath);

//最终的视频文件将位于以下位置:///Users/caferrara/Library/Application Support/iPhone Simulator/6.0/Applications/D4B12FEE-E09C-4B12-B772-7F1BD6011BE1/Documents/outputFile.mov

// the final video file will be located somewhere like here:// /Users/caferrara/Library/Application Support/iPhone Simulator/6.0/Applications/D4B12FEE-E09C-4B12-B772-7F1BD6011BE1/Documents/outputFile.mov

}

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videoOutputPath

如何使用AVAssetWriter将h264 strem写入视频?

问题描述

推荐答案

尝试此代码