我正在尝试使用图片数组和音频文件制作电影文件。为了制作带有图片阵列的电影，我使用了zoul here的大帖子。一切都很完美，我的电影和我的照片一样。但是，当我尝试添加一些音轨时，我遇到了很多问题。要理解我把我的代码：
当我调用此方法时，图片数组和歌曲文件已准备就绪：
-(void) writeImagesToMovieAtPath:(NSString *) path withSize:(CGSize) size
{
NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSArray *dirContents = [[NSFileManager defaultManager] directoryContentsAtPath:documentsDirectoryPath];
for (NSString *tString in dirContents) {
if ([tString isEqualToString:@"essai.mp4"])
{
[[NSFileManager defaultManager]removeItemAtPath:[NSString stringWithFormat:@"%@/%@",documentsDirectoryPath,tString] error:nil];
}
}
NSLog(@"Write Started");
NSError *error = nil;
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL fileURLWithPath:path] fileType:AVFileTypeMPEG4
error:&error];
NSParameterAssert(videoWriter);
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:size.width], AVVideoWidthKey,
[NSNumber numberWithInt:size.height], AVVideoHeightKey,
nil];
AudioChannelLayout channelLayout;
memset(&channelLayout, 0, sizeof(AudioChannelLayout));
channelLayout.mChannelLayoutTag = kAudioChannelLayoutTag_Stereo;
NSDictionary *audioSettings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:kAudioFormatMPEG4AAC], AVFormatIDKey,
[NSNumber numberWithFloat:44100.0] ,AVSampleRateKey,
[NSNumber numberWithInt: 1] ,AVNumberOfChannelsKey,
[NSNumber numberWithInt:192000],AVEncoderBitRateKey,
[NSData dataWithBytes:&channelLayout length:sizeof(AudioChannelLayout)],AVChannelLayoutKey,
nil];
AVAssetWriterInput* videoWriterInput = [[AVAssetWriterInput
assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings] retain];
AVAssetWriterInput* audioWriterInput = [[AVAssetWriterInput
assetWriterInputWithMediaType:AVMediaTypeAudio
outputSettings:audioSettings] retain];
NSURL* fileURL = [[NSBundle mainBundle] URLForResource:@"Big_Voice_1" withExtension:@"caf"];
NSLog(@"%@",fileURL);
AVAsset *asset = [[AVURLAsset URLAssetWithURL:fileURL
options:nil] retain];
AVAssetReader *audioReader = [[AVAssetReader assetReaderWithAsset:asset error:&error] retain];
AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput
sourcePixelBufferAttributes:nil];
AVAssetTrack* audioTrack = [asset.tracks objectAtIndex:0];
AVAssetReaderOutput *readerOutput = [AVAssetReaderTrackOutput assetReaderTrackOutputWithTrack:audioTrack outputSettings:nil];
[audioReader addOutput:readerOutput];
NSParameterAssert(videoWriterInput);
NSParameterAssert(audioWriterInput);
NSParameterAssert([videoWriter canAddInput:audioWriterInput]);
NSParameterAssert([videoWriter canAddInput:videoWriterInput]);
audioWriterInput.expectsMediaDataInRealTime = NO;
videoWriterInput.expectsMediaDataInRealTime = YES;
[videoWriter addInput:audioWriterInput];
[videoWriter addInput:videoWriterInput];
//Start a session:
[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
//Video encoding
CVPixelBufferRef buffer = NULL;
//convert uiimage to CGImage.
int frameCount = 0;
for(int i = 0; i<20; i++)
{
buffer = [self pixelBufferFromCGImage:[[m_PictArray objectAtIndex:i] CGImage] andSize:size];
BOOL append_ok = NO;
int j = 0;
while (!append_ok && j < 30)
{
if (adaptor.assetWriterInput.readyForMoreMediaData)
{
printf("appending %d attemp %d\n", frameCount, j);
CMTime frameTime = CMTimeMake(frameCount,(int32_t) 10);
//CVPixelBufferPoolCreatePixelBuffer (kCFAllocatorDefault, adaptor.pixelBufferPool, &buffer);
append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
CVPixelBufferPoolRef bufferPool = adaptor.pixelBufferPool;
NSParameterAssert(bufferPool != NULL);
[NSThread sleepForTimeInterval:0.05];
}
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", frameCount, j);
}
frameCount++;
}
//Finish the session:
[videoWriterInput markAsFinished];
//Start a session:
[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
CVPixelBufferRef buffer = NULL;
//Write all picture array in movie file.
int frameCount = 0;
for(int i = 0; i<[m_PictArray count]; i++)
{
buffer = [self pixelBufferFromCGImage:[[m_PictArray objectAtIndex:i] CGImage] andSize:size];
BOOL append_ok = NO;
int j = 0;
while (!append_ok && j < 30)
{
if (adaptor.assetWriterInput.readyForMoreMediaData)
{
printf("appending %d attemp %d\n", frameCount, j);
CMTime frameTime = CMTimeMake(frameCount,(int32_t) 10);
append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
CVPixelBufferPoolRef bufferPool = adaptor.pixelBufferPool;
NSParameterAssert(bufferPool != NULL);
[NSThread sleepForTimeInterval:0.05];
}
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", frameCount, j);
}
frameCount++;
}
//Finish writing picture:
[videoWriterInput markAsFinished];
我在电影文件中写完图片，我想在文件中复制音频，我这样做：
[audioReader startReading];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
dispatch_queue_t mediaInputQueue = dispatch_queue_create("mediaInputQueue", NULL);
[audioWriterInput requestMediaDataWhenReadyOnQueue:mediaInputQueue usingBlock:^
{
NSLog(@"Request");
NSLog(@"Asset Writer ready :%d",audioWriterInput.readyForMoreMediaData);
while (audioWriterInput.readyForMoreMediaData) {
NSLog(@"Ready");
CMSampleBufferRef nextBuffer = [readerOutput copyNextSampleBuffer];
if (nextBuffer) {
NSLog(@"NextBuffer");
[audioWriterInput appendSampleBuffer:nextBuffer];
}
}
}
];
[audioWriterInput markAsFinished];
[videoWriter finishWriting];
但音频文件的AssetWriterInput状态始终为“NO”。
我的问题：如何使用AVFoundation将音频添加到视频文件中？
所以，有人可以通过告诉我是否忘记某些事情或者出现问题来帮助我。
非常感谢
答案 0 :(得分：43)
我终于找到了如何使用图片数组和音频文件制作电影。所以，如果你想做同样的事情我把我的代码放在这里（小心记忆）：
首先使用你的图片数组制作一个电影文件，使用zoul的帖子here：
-(void) writeImagesToMovieAtPath:(NSString *) path withSize:(CGSize) size
{
NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectoryPath error:nil];
for (NSString *tString in dirContents)
{
if ([tString isEqualToString:@"essai.mp4"])
{
[[NSFileManager defaultManager]removeItemAtPath:[NSString stringWithFormat:@"%@/%@",documentsDirectoryPath,tString] error:nil];
}
}
NSLog(@"Write Started");
NSError *error = nil;
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL fileURLWithPath:path] fileType:AVFileTypeMPEG4
error:&error];
NSParameterAssert(videoWriter);
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:size.width], AVVideoWidthKey,
[NSNumber numberWithInt:size.height], AVVideoHeightKey,
nil];
AVAssetWriterInput* videoWriterInput = [[AVAssetWriterInput
assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings] retain];
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];
//Video encoding
CVPixelBufferRef buffer = NULL;
//convert uiimage to CGImage.
int frameCount = 0;
for(int i = 0; i<[m_PictArray count]; i++)
{
buffer = [self pixelBufferFromCGImage:[[m_PictArray objectAtIndex:i] CGImage] andSize:size];
BOOL append_ok = NO;
int j = 0;
while (!append_ok && j < 30)
{
if (adaptor.assetWriterInput.readyForMoreMediaData)
{
printf("appending %d attemp %d\n", frameCount, j);
CMTime frameTime = CMTimeMake(frameCount,(int32_t) 10);
append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
CVPixelBufferPoolRef bufferPool = adaptor.pixelBufferPool;
NSParameterAssert(bufferPool != NULL);
[NSThread sleepForTimeInterval:0.05];
}
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", frameCount, j);
}
frameCount++;
CVBufferRelease(buffer);
}
[videoWriterInput markAsFinished];
[videoWriter finishWriting];
[videoWriterInput release];
[videoWriter release];
[m_PictArray removeAllObjects];
NSLog(@"Write Ended");
}
之后你必须把电影文件和音频文件放在一起。为此，请遵循我的代码：
-(void)CompileFilesToMakeMovie
{
AVMutableComposition* mixComposition = [AVMutableComposition composition];
NSString* audio_inputFileName = @"deformed.caf";
NSString* audio_inputFilePath = [Utilities documentsPath:audio_inputFileName];
NSURL* audio_inputFileUrl = [NSURL fileURLWithPath:audio_inputFilePath];
NSString* video_inputFileName = @"essai.mp4";
NSString* video_inputFilePath = [Utilities documentsPath:video_inputFileName];
NSURL* video_inputFileUrl = [NSURL fileURLWithPath:video_inputFilePath];
NSString* outputFileName = @"outputFile.mov";
NSString* outputFilePath = [Utilities documentsPath:outputFileName];
NSURL* outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath])
[[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];
CMTime nextClipStartTime = kCMTimeZero;
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);
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 presetName:AVAssetExportPresetHighestQuality];
_assetExport.outputFileType = @"com.apple.quicktime-movie";
_assetExport.outputURL = outputFileUrl;
[_assetExport exportAsynchronouslyWithCompletionHandler:
^(void ) {
[self saveVideoToAlbum:outputFilePath];
}
];
}
我希望我帮助过你。对不起，如果有一些泄漏，我正在做内存优化。
答案 1 :(得分：3)
AVChannelLayoutKey应指向包含AudioChannelLayout的NSData实例。
你的指向NSNumber。