如何使用比特率压缩ios中的视频？ [英] How can i compress a video in ios using Bit Rate?
本文介绍了如何使用比特率压缩ios中的视频？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
如何使用比特率压缩视频？
我尝试使用下面的代码来压缩视频，但它不起作用，因为它给我一个像
******由于未捕获的异常'NSInvalidArgumentException'终止应用程序，原因：'* - [AVAssetReader startReading]在读取后无法再次调用已开始' ****
- （无效）imagePickerController：（UIImagePickerController *）选取器
didFinishPickingMediaWithInfo：（NSDictionary *）info
{
//处理电影捕获
NSURL * movieURL = [info objectForKey：
UIImagePickerControllerMediaURL ]。
NSData * data = [NSData dataWithContentsOfURL：movieURL];
NSArray * paths = NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）;
NSString * documentsDirectory = [paths objectAtIndex：0];
NSString * tempPath = [documentsDirectory stringByAppendingFormat：@/ vid1.mp4];
BOOL success = [data writeToFile：tempPath atomically：NO];
if（成功）
{
NSLog（@VIdeo成功编写）;
}
其他
{
NSLog（@VIdeo Wrting失败）;
}
NSURL * uploadURL = [NSURL fileURLWithPath：[[NSTemporaryDirectory（）stringByAppendingPathComponent：@1234] stringByAppendingString：@。mp4]];
//首先压缩电影
[self convertVideoToLowQuailtyWithInputURL：movieURL outputURL：uploadURL];
}
- （无效）convertVideoToLowQuailtyWithInputURL：（NSURL *）inputURL
outputURL：（NSURL *）outputURL
{
//设置视频编写器
AVAsset * videoAsset = [[AVURLAsset alloc] initWithURL：inputURL options：nil];
AVAssetTrack * videoTrack = [[videoAsset tracksWithMediaType：AVMediaTypeVideo] objectAtIndex：0];
CGSize videoSize = videoTrack.naturalSize;
NSDictionary * videoWriterCompressionSettings = [NSDictionary dictionaryWithObjectsAndKeys：[NSNumber numberWithInt：1250000]，AVVideoAverageBitRateKey，nil];
NSDictionary * videoWriterSettings = [NSDictionary dictionaryWithObjectsAndKeys：AVVideoCodecH264，AVVideoCodecKey，videoWriterCompressionSettings，AVVideoCompressionPropertiesKey，[NSNumber numberWithFloat：videoSize.width]，AVVideoWidthKey，[NSNumber numberWithFloat：videoSize.height]，AVVideoHeightKey，nil];
AVAssetWriterInput * videoWriterInput = [AVAssetWriterInput
assetWriterInputWithMediaType：AVMediaTypeVideo
outputSettings：videoWriterSettings];
videoWriterInput.expectsMediaDataInRealTime = YES;
videoWriterInput.transform = videoTrack.preferredTransform;
AVAssetWriter * videoWriter = [[AVAssetWriter alloc] initWithURL：outputURL fileType：AVFileTypeQuickTimeMovie error：nil];
[videoWriter addInput：videoWriterInput];
//设置视频阅读器
NSDictionary * videoReaderSettings = [NSDictionary dictionaryWithObject：[NSNumber numberWithInt：kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange] forKey：（id）kCVPixelBufferPixelFormatTypeKey];
AVAssetReaderTrackOutput * videoReaderOutput = [[AVAssetReaderTrackOutput alloc] initWithTrack：videoTrack outputSettings：videoReaderSettings];
AVAssetReader * videoReader = [[AVAssetReader alloc] initWithAsset：videoAsset error：nil];
[videoReader addOutput：videoReaderOutput];
//设置音频编写器
AVAssetWriterInput * audioWriterInput = [AVAssetWriterInput
assetWriterInputWithMediaType：AVMediaTypeAudio
outputSettings：nil];
audioWriterInput.expectsMediaDataInRealTime = NO;
[videoWriter addInput：audioWriterInput];
//设置音频阅读器
AVAssetTrack * audioTrack = [[videoAsset tracksWithMediaType：AVMediaTypeAudio] objectAtIndex：0];
AVAssetReaderOutput * audioReaderOutput = [AVAssetReaderTrackOutput assetReaderTrackOutputWithTrack：audioTrack outputSettings：nil];
AVAssetReader * audioReader = [AVAssetReader assetReaderWithAsset：videoAsset error：nil];
[audioReader addOutput：audioReaderOutput];
[videoWriter startWriting];
//从视频阅读器开始写作
[videoReader startReading];
[videoWriter startSessionAtSourceTime：kCMTimeZero];
dispatch_queue_t processingQueue = dispatch_queue_create（processingQueue1，NULL）;
[videoWriterInput requestMediaDataWhenReadyOnQueue：processingQueue usingBlock：
^ {
while（[videoWriterInput isReadyForMoreMediaData]）
{
CMSampleBufferRef sampleBuffer;
if（[videoReader status] == AVAssetReaderStatusReading&&
（sampleBuffer = [videoReaderOutput copyNextSampleBuffer]））
{
[videoWriterInput appendSampleBuffer ：sampleBuffer];
CFRelease（sampleBuffer）;
}
其他
{
[videoWriterInput markAsFinished];
if（[videoReader status] == AVAssetReaderStatusCompleted）
{
[audioReader startReading];
[videoWriter startSessionAtSourceTime：kCMTimeZero];
dispatch_queue_t processingQueue = dispatch_queue_create（processingQueue2，NULL）;
[audioWriterInput requestMediaDataWhenReadyOnQueue：processingQueue usingBlock：^ {
while（audioWriterInput.readyForMoreMediaData）
{
CMSampleBufferRef sampleBuffer;
if（[audioReader status] == AVAssetReaderStatusReading&&
（sampleBuffer = [audioReaderOutput copyNextSampleBuffer]））{
[audioWriterInput appendSampleBuffer：sampleBuffer];
CFRelease（sampleBuffer）;
}
其他
{
[audioWriterInput markAsFinished];
if（[audioReader status] == AVAssetReaderStatusCompleted）
{
[videoWriter finishWritingWithCompletionHandler：^（）
{
NSLog（@输出URl： ％@，outputURL）;
}];
}
}
}
}
];
}
}
}
}
];
}
解决方案
您可以使用以下参数压缩视频的质量。
- AVAssetExportPresetLowQuality
- AVAssetExportPresetMediumQuality
- AVAssetExportPresetHighestQuality
代码：
- （void）CompressVideo
{
if（firstAsset！= nil）
{
//创建AVMutableComposition对象。此对象将保持我们的多个AVMutableCompositionTrack。
AVMutableComposition * mixComposition = [[AVMutableComposition alloc] init];
// http://stackoverflow.com/questions/22715881/merge-video-files-with-their-original-audio-in-ios
//视频TRACK
AVMutableCompositionTrack * firstTrack = [mixComposition addMutableTrackWithMediaType：AVMediaTypeVideo preferredTrackID：kCMPersistentTrackID_Invalid];
[firstTrack insertTimeRange：CMTimeRangeMake（kCMTimeZero，firstAsset.duration）ofTrack：[[firstAsset tracksWithMediaType：AVMediaTypeVideo] objectAtIndex：0] atTime：kCMTimeZero error：nil];
//对于音轨包含
// ============================== ================================================== ============
NSArray * arr = [firstAsset tracksWithMediaType：AVMediaTypeAudio];
AVMutableCompositionTrack * audioTrack = [mixComposition addMutableTrackWithMediaType：AVMediaTypeAudio preferredTrackID：kCMPersistentTrackID_Invalid];
[audioTrack insertTimeRange：CMTimeRangeMake（kCMTimeZero，firstAsset.duration）ofTrack：[arr lastObject] atTime：kCMTimeZero error：nil];
// ============================================ ================================================== =
AVMutableVideoCompositionInstruction * MainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
MainInstruction.timeRange = CMTimeRangeMake（kCMTimeZero，firstAsset.duration）;
// FIXING ORIENTATION //
AVMutableVideoCompositionLayerInstruction * FirstlayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack：firstTrack];
AVAssetTrack * FirstAssetTrack = [[firstAsset tracksWithMediaType：AVMediaTypeVideo] objectAtIndex：0];
UIImageOrientation FirstAssetOrientation_ = UIImageOrientationUp;
BOOL isFirstAssetPortrait_ = NO;
CGAffineTransform firstTransform = FirstAssetTrack.preferredTransform;
if（firstTransform.a == 0&& firstTransform.b == 1.0&& firstTransform.c == -1.0&& firstTransform.d == 0）{FirstAssetOrientation_ = UIImageOrientationRight; isFirstAssetPortrait_ = YES;}
if（firstTransform.a == 0&& firstTransform.b == -1.0&& firstTransform.c == 1.0&& firstTransform.d == 0）{ FirstAssetOrientation_ = UIImageOrientationLeft; isFirstAssetPortrait_ = YES;}
if（firstTransform.a == 1.0&& firstTransform.b == 0&& firstTransform.c == 0&& firstTransform.d == 1.0）{FirstAssetOrientation_ = UIImageOrientationUp;}
if（firstTransform.a == -1.0&& firstTransform.b == 0&& firstTransform.c == 0&& firstTransform.d == -1.0）{ FirstAssetOrientation_ = UIImageOrientationDown;
}
CGFloat FirstAssetScaleToFitRatio = VideoWidth / FirstAssetTrack.naturalSize.width;
if（isFirstAssetPortrait_）
{
FirstAssetScaleToFitRatio = VideoWidth / FirstAssetTrack.naturalSize.height;
CGAffineTransform FirstAssetScaleFactor = CGAffineTransformMakeScale（FirstAssetScaleToFitRatio，FirstAssetScaleToFitRatio）;
[FirstlayerInstruction setTransform：CGAffineTransformConcat（FirstAssetTrack.preferredTransform，FirstAssetScaleFactor）atTime：kCMTimeZero];
}
else
{
CGAffineTransform FirstAssetScaleFactor = CGAffineTransformMakeScale（FirstAssetScaleToFitRatio，FirstAssetScaleToFitRatio）;
[FirstlayerInstruction setTransform：CGAffineTransformConcat（CGAffineTransformConcat（FirstAssetTrack.preferredTransform，FirstAssetScaleFactor），CGAffineTransformMakeTranslation（0,160））atTime：kCMTimeZero];
}
[FirstlayerInstruction setOpacity：0.0 atTime：firstAsset.duration];
MainInstruction.layerInstructions = [NSArray arrayWithObjects：FirstlayerInstruction，nil];
AVMutableVideoComposition * MainCompositionInst = [AVMutableVideoComposition videoComposition];
MainCompositionInst.instructions = [NSArray arrayWithObject：MainInstruction];
MainCompositionInst.frameDuration = CMTimeMake（1,30）;
// MainCompositionInst.renderSize = CGSizeMake（VideoWidth，900）;
MainCompositionInst.renderSize = CGSizeMake（VideoWidth，[UIScreen mainScreen] .bounds.size.height）;
NSArray * paths = NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）;
NSString * documentsDirectory = [paths objectAtIndex：0];
NSString * myPathDocs = [documentsDirectory stringByAppendingPathComponent：@CompressedVideo.mov];
NSLog（@myPath Docs：％@，myPathDocs）;
NSURL * url = [NSURL fileURLWithPath：myPathDocs];
if（[[NSFileManager defaultManager] fileExistsAtPath：myPathDocs]）
{
NSError * error;
[[NSFileManager defaultManager] removeItemAtPath：myPathDocs error：& error];
}
//电影质量
// =========================== =======================
AVAssetExportSession * exporter = [[AVAssetExportSession alloc] initWithAsset：mixComposition presetName：AVAssetExportPresetMediumQuality];
// ============================================ ======
exporter.outputURL = url;
//电影类型
// ================================ ==================
exporter.outputFileType = AVFileTypeQuickTimeMovie;
// ============================================ ======
exporter.videoComposition = MainCompositionInst;
exporter.shouldOptimizeForNetworkUse = YES;
[exporter exportAsynchronouslyWithCompletionHandler：^
{
dispatch_async（dispatch_get_main_queue（），^
{
videoUrToUload = url;
[self exportDidFinish：exporter];
}）;
}];
}
}
- （void）exportDidFinish：（AVAssetExportSession *）session
{
if（session.status == AVAssetExportSessionStatusCompleted）
{
//使用session.url存储URL某处
}
}
How can i compress a video using bit rate ?
I tried below code to compress a video but its not working because it giving me an error like
******Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[AVAssetReader startReading] cannot be called again after reading has already started'****
- (void) imagePickerController: (UIImagePickerController *) picker
didFinishPickingMediaWithInfo: (NSDictionary *) info
{
// Handle movie capture
NSURL *movieURL = [info objectForKey:
UIImagePickerControllerMediaURL];
NSData *data = [NSData dataWithContentsOfURL:movieURL];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *tempPath = [documentsDirectory stringByAppendingFormat:@"/vid1.mp4"];
BOOL success = [data writeToFile:tempPath atomically:NO];
if (success)
{
NSLog(@"VIdeo Successfully written");
}
else
{
NSLog(@"VIdeo Wrting failed");
}
NSURL *uploadURL = [NSURL fileURLWithPath:[[NSTemporaryDirectory() stringByAppendingPathComponent:@"1234"] stringByAppendingString:@".mp4"]];
// Compress movie first
[self convertVideoToLowQuailtyWithInputURL:movieURL outputURL:uploadURL];
}
- (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL
outputURL:(NSURL*)outputURL
{
//setup video writer
AVAsset *videoAsset = [[AVURLAsset alloc] initWithURL:inputURL options:nil];
AVAssetTrack *videoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
CGSize videoSize = videoTrack.naturalSize;
NSDictionary *videoWriterCompressionSettings = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:1250000], AVVideoAverageBitRateKey, nil];
NSDictionary *videoWriterSettings = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecH264, AVVideoCodecKey, videoWriterCompressionSettings, AVVideoCompressionPropertiesKey, [NSNumber numberWithFloat:videoSize.width], AVVideoWidthKey, [NSNumber numberWithFloat:videoSize.height], AVVideoHeightKey, nil];
AVAssetWriterInput* videoWriterInput = [AVAssetWriterInput
assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoWriterSettings];
videoWriterInput.expectsMediaDataInRealTime = YES;
videoWriterInput.transform = videoTrack.preferredTransform;
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:outputURL fileType:AVFileTypeQuickTimeMovie error:nil];
[videoWriter addInput:videoWriterInput];
//setup video reader
NSDictionary *videoReaderSettings = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange] forKey:(id)kCVPixelBufferPixelFormatTypeKey];
AVAssetReaderTrackOutput *videoReaderOutput = [[AVAssetReaderTrackOutput alloc] initWithTrack:videoTrack outputSettings:videoReaderSettings];
AVAssetReader *videoReader = [[AVAssetReader alloc] initWithAsset:videoAsset error:nil];
[videoReader addOutput:videoReaderOutput];
//setup audio writer
AVAssetWriterInput* audioWriterInput = [AVAssetWriterInput
assetWriterInputWithMediaType:AVMediaTypeAudio
outputSettings:nil];
audioWriterInput.expectsMediaDataInRealTime = NO;
[videoWriter addInput:audioWriterInput];
//setup audio reader
AVAssetTrack* audioTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
AVAssetReaderOutput *audioReaderOutput = [AVAssetReaderTrackOutput assetReaderTrackOutputWithTrack:audioTrack outputSettings:nil];
AVAssetReader *audioReader = [AVAssetReader assetReaderWithAsset:videoAsset error:nil];
[audioReader addOutput:audioReaderOutput];
[videoWriter startWriting];
//start writing from video reader
[videoReader startReading];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
dispatch_queue_t processingQueue = dispatch_queue_create("processingQueue1", NULL);
[videoWriterInput requestMediaDataWhenReadyOnQueue:processingQueue usingBlock:
^{
while ([videoWriterInput isReadyForMoreMediaData])
{
CMSampleBufferRef sampleBuffer;
if ([videoReader status] == AVAssetReaderStatusReading &&
(sampleBuffer = [videoReaderOutput copyNextSampleBuffer]))
{
[videoWriterInput appendSampleBuffer:sampleBuffer];
CFRelease(sampleBuffer);
}
else
{
[videoWriterInput markAsFinished];
if ([videoReader status] == AVAssetReaderStatusCompleted)
{
[audioReader startReading];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
dispatch_queue_t processingQueue = dispatch_queue_create("processingQueue2", NULL);
[audioWriterInput requestMediaDataWhenReadyOnQueue:processingQueue usingBlock:^{
while (audioWriterInput.readyForMoreMediaData)
{
CMSampleBufferRef sampleBuffer;
if ([audioReader status] == AVAssetReaderStatusReading &&
(sampleBuffer = [audioReaderOutput copyNextSampleBuffer])) {
[audioWriterInput appendSampleBuffer:sampleBuffer];
CFRelease(sampleBuffer);
}
else
{
[audioWriterInput markAsFinished];
if ([audioReader status] == AVAssetReaderStatusCompleted)
{
[videoWriter finishWritingWithCompletionHandler:^()
{
NSLog(@"Output URl : %@",outputURL);
}];
}
}
}
}
];
}
}
}
}
];
}
解决方案
You can use the parameters below to compress the video for qualities.
- AVAssetExportPresetLowQuality
- AVAssetExportPresetMediumQuality
- AVAssetExportPresetHighestQuality
Code:
- (void)CompressVideo
{
if(firstAsset !=nil)
{
//Create AVMutableComposition Object.This object will hold our multiple AVMutableCompositionTrack.
AVMutableComposition* mixComposition = [[AVMutableComposition alloc] init];
// http://stackoverflow.com/questions/22715881/merge-video-files-with-their-original-audio-in-ios
//VIDEO TRACK
AVMutableCompositionTrack *firstTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, firstAsset.duration) ofTrack:[[firstAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil];
//For Audio Track inclusion
//============================================================================================
NSArray *arr = [firstAsset tracksWithMediaType:AVMediaTypeAudio];
AVMutableCompositionTrack *audioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
[audioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, firstAsset.duration) ofTrack:[arr lastObject] atTime:kCMTimeZero error:nil];
//===============================================================================================
AVMutableVideoCompositionInstruction *MainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
MainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, firstAsset.duration);
//FIXING ORIENTATION//
AVMutableVideoCompositionLayerInstruction *FirstlayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:firstTrack];
AVAssetTrack *FirstAssetTrack = [[firstAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
UIImageOrientation FirstAssetOrientation_ = UIImageOrientationUp;
BOOL isFirstAssetPortrait_ = NO;
CGAffineTransform firstTransform = FirstAssetTrack.preferredTransform;
if(firstTransform.a == 0 && firstTransform.b == 1.0 && firstTransform.c == -1.0 && firstTransform.d == 0) {FirstAssetOrientation_= UIImageOrientationRight; isFirstAssetPortrait_ = YES;}
if(firstTransform.a == 0 && firstTransform.b == -1.0 && firstTransform.c == 1.0 && firstTransform.d == 0) {FirstAssetOrientation_ = UIImageOrientationLeft; isFirstAssetPortrait_ = YES;}
if(firstTransform.a == 1.0 && firstTransform.b == 0 && firstTransform.c == 0 && firstTransform.d == 1.0) {FirstAssetOrientation_ = UIImageOrientationUp;}
if(firstTransform.a == -1.0 && firstTransform.b == 0 && firstTransform.c == 0 && firstTransform.d == -1.0) {FirstAssetOrientation_ = UIImageOrientationDown;
}
CGFloat FirstAssetScaleToFitRatio = VideoWidth/FirstAssetTrack.naturalSize.width;
if(isFirstAssetPortrait_)
{
FirstAssetScaleToFitRatio = VideoWidth/FirstAssetTrack.naturalSize.height;
CGAffineTransform FirstAssetScaleFactor = CGAffineTransformMakeScale(FirstAssetScaleToFitRatio,FirstAssetScaleToFitRatio);
[FirstlayerInstruction setTransform:CGAffineTransformConcat(FirstAssetTrack.preferredTransform, FirstAssetScaleFactor) atTime:kCMTimeZero];
}
else
{
CGAffineTransform FirstAssetScaleFactor = CGAffineTransformMakeScale(FirstAssetScaleToFitRatio,FirstAssetScaleToFitRatio);
[FirstlayerInstruction setTransform:CGAffineTransformConcat(CGAffineTransformConcat(FirstAssetTrack.preferredTransform, FirstAssetScaleFactor),CGAffineTransformMakeTranslation(0, 160)) atTime:kCMTimeZero];
}
[FirstlayerInstruction setOpacity:0.0 atTime:firstAsset.duration];
MainInstruction.layerInstructions = [NSArray arrayWithObjects:FirstlayerInstruction,nil];
AVMutableVideoComposition *MainCompositionInst = [AVMutableVideoComposition videoComposition];
MainCompositionInst.instructions = [NSArray arrayWithObject:MainInstruction];
MainCompositionInst.frameDuration = CMTimeMake(1, 30);
// MainCompositionInst.renderSize = CGSizeMake(VideoWidth, 900);
MainCompositionInst.renderSize = CGSizeMake(VideoWidth, [UIScreen mainScreen].bounds.size.height);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *myPathDocs = [documentsDirectory stringByAppendingPathComponent:@"CompressedVideo.mov"];
NSLog(@"myPath Docs : %@",myPathDocs);
NSURL *url = [NSURL fileURLWithPath:myPathDocs];
if ([[NSFileManager defaultManager] fileExistsAtPath:myPathDocs])
{
NSError *error;
[[NSFileManager defaultManager] removeItemAtPath:myPathDocs error:&error];
}
//Movie Quality
//==================================================
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetMediumQuality];
//==================================================
exporter.outputURL=url;
//Movie Type
//==================================================
exporter.outputFileType = AVFileTypeQuickTimeMovie;
//==================================================
exporter.videoComposition = MainCompositionInst;
exporter.shouldOptimizeForNetworkUse = YES;
[exporter exportAsynchronouslyWithCompletionHandler:^
{
dispatch_async(dispatch_get_main_queue(), ^
{
videoUrToUload = url;
[self exportDidFinish:exporter];
});
}];
}
}
- (void)exportDidFinish:(AVAssetExportSession *)session
{
if(session.status == AVAssetExportSessionStatusCompleted)
{
//Store URL Somewhere using session.url
}
}
这篇关于如何使用比特率压缩ios中的视频？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
