iOS上视频剪辑片段和添加背景音乐

来源：互联网发布：如何用java编写计算器编辑：程序博客网时间：2024/05/23 11:45

最近在研究剪辑视频，目前知道了怎么剪辑视频片段和添加背景音乐，不多说了，代码写的很清楚，如下：

1 添加背景音乐调用

    [PSJVideoEditor cropWithVideoUrlStr:_videoUrl audioUrl:_audioUrl start:3 end:8 isOrignalSound:isOrignalSound completion:^(NSString *outPath, BOOL isSuccess) {        if (isSuccess) {            _videoUrl = [NSURL URLWithString:outPath];        }    }];

2 剪辑视频片段调用

        [PSJVideoEditor addBackgroundMiusicWithVideoUrlStr:_videoUrl audioUrl:_audioUrl start:3 end:8 isOrignalSound:isOrignalSound completion:^(NSString *outPath, BOOL isSuccess) {            if (isSuccess) {                _videoUrl = [NSURL URLWithString:outPath];            }        }];

3 附上源码

#import <Foundation/Foundation.h>#import <UIKit/UIKit.h>@interface PSJVideoEditor : NSObject/*! @method @brief  视频添加音频 @discussion @param videoUrl 视频URL @param audioUrl 音频URL @param startTime 音频插入开始时间 @param startTime 音频插入结束时间 @param isOrignalSound 是否保留原声 @param completionHandle   完成回调 */+ (void)addBackgroundMiusicWithVideoUrlStr:(NSURL *)videoUrl                                  audioUrl:(NSURL *)audioUrl                                     start:(CGFloat)startTime                                       end:(CGFloat)startTime                            isOrignalSound:(BOOL)isOrignal                                completion:(void (^)(NSString *outPath,BOOL isSuccess))completionHandle;/*! @method @brief  剪辑视频 @discussion @param videoUrl 视频URL @param audioUrl 音频URL @param startTime 剪辑开始时间 @param startTime 剪辑结束时间 @param isOrignalSound 是否保留原声 @param completionHandle   完成回调 */+ (void)cropWithVideoUrlStr:(NSURL *)videoUrl                   audioUrl:(NSURL *)audioUrl                      start:(CGFloat)startTime                        end:(CGFloat)endTime             isOrignalSound:(BOOL)isOrignal                 completion:(void (^)(NSString *outPath,BOOL isSuccess))completionHandle;@end

#import "PSJVideoEditor.h"#import <AVFoundation/AVFoundation.h>#define MediaFileName @"MixVideo.MOV"@implementation PSJVideoEditor+ (void)addBackgroundMiusicWithVideoUrlStr:(NSURL *)videoUrl                                  audioUrl:(NSURL *)audioUrl                                     start:(CGFloat)startTime                                       end:(CGFloat)endTime                                 isOrignalSound:(BOOL)isOrignal                                completion:(void (^)(NSString *outPath,BOOL isSuccess))completionHandle{    //声音来源路径（最终混合的音频）    NSURL   *audio_inputFileUrl = audioUrl;        //视频来源路径    NSURL   *video_inputFileUrl = videoUrl;        NSString *outputFilePath = [PSJVideoEditor fileSavePath];    NSURL   *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];            CMTime nextClipStartTime = kCMTimeZero;        //创建可变的音频视频组合    AVMutableComposition* mixComposition =[AVMutableComposition composition];        //视频采集    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];            CMTime start = CMTimeMakeWithSeconds(startTime, videoAsset.duration.timescale);    CMTime duration = CMTimeMakeWithSeconds(endTime - startTime,videoAsset.duration.timescale);    CMTimeRange audio_timeRange = CMTimeRangeMake(start, duration);        <span style="color:#3366ff;">    if (isOrignal) {        //视频声音采集(也可不执行这段代码不采集视频音轨，合并后的视频文件将没有视频原来的声音)        CMTimeRange videoTimeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);        AVMutableCompositionTrack *compositionVoiceTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];                [compositionVoiceTrack insertTimeRange:videoTimeRange ofTrack:([videoAsset tracksWithMediaType:AVMediaTypeAudio].count>0)?[videoAsset tracksWithMediaType:AVMediaTypeAudio].firstObject:nil atTime:kCMTimeZero error:nil];    }</span>       <span style="color:#ff0000;"> //音乐声音采集    AVURLAsset* audioAsset =[[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];    //CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);//声音长度截取范围==视频长度    AVMutableCompositionTrack*b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio                                                                                    preferredTrackID:kCMPersistentTrackID_Invalid];    //3秒到8秒 则atTime从3秒开始    [b_compositionAudioTrack insertTimeRange:audio_timeRange                                     ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]                                      atTime:start                                       error:nil];</span>        //创建一个输出    AVAssetExportSession* _assetExport =[[AVAssetExportSession alloc]initWithAsset:mixComposition presetName:AVAssetExportPresetMediumQuality];    _assetExport.outputFileType = AVFileTypeQuickTimeMovie;    _assetExport.outputURL = outputFileUrl;    _assetExport.shouldOptimizeForNetworkUse= YES;        [_assetExport exportAsynchronouslyWithCompletionHandler:     ^(void ) {         switch ([_assetExport status]) {             case AVAssetExportSessionStatusFailed: {                 NSLog(@"合成失败：%@",[[_assetExport error] description]);                 completionHandle(outputFilePath,NO);             } break;             case AVAssetExportSessionStatusCancelled: {                 completionHandle(outputFilePath,NO);             } break;             case AVAssetExportSessionStatusCompleted: {                 completionHandle(outputFilePath,YES);             } break;             default: {                 completionHandle(outputFilePath,NO);             } break;         }              }     ];}

+ (void)cropWithVideoUrlStr:(NSURL *)videoUrl                   audioUrl:(NSURL *)audioUrl                      start:(CGFloat)startTime                        end:(CGFloat)endTime             isOrignalSound:(BOOL)isOrignal                 completion:(void (^)(NSString *outPath,BOOL isSuccess))completionHandle{    NSURL   *audio_inputFileUrl = audioUrl;        //视频来源路径    NSURL   *video_inputFileUrl = videoUrl;        NSString *outputFilePath = [PSJVideoEditor fileSavePath];    NSURL   *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];        AVURLAsset* videoAsset =[[AVURLAsset alloc]initWithURL:video_inputFileUrl options:nil];            CMTime nextClipStartTime = kCMTimeZero;        //创建可变的音频视频组合    AVMutableComposition* mixComposition =[AVMutableComposition composition];        //视频采集    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];            CMTime start = CMTimeMakeWithSeconds(startTime, videoAsset.duration.timescale);    CMTime duration = CMTimeMakeWithSeconds(endTime - startTime,videoAsset.duration.timescale);    CMTimeRange audio_timeRange = CMTimeRangeMake(start, duration);            if (isOrignal) {        //视频声音采集(也可不执行这段代码不采集视频音轨，合并后的视频文件将没有视频原来的声音)        CMTimeRange videoTimeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);        AVMutableCompositionTrack *compositionVoiceTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];                [compositionVoiceTrack insertTimeRange:videoTimeRange ofTrack:([videoAsset tracksWithMediaType:AVMediaTypeAudio].count>0)?[videoAsset tracksWithMediaType:AVMediaTypeAudio].firstObject:nil atTime:kCMTimeZero error:nil];    }        //音乐声音采集    AVURLAsset* audioAsset =[[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];    //CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);//声音长度截取范围==视频长度    AVMutableCompositionTrack*b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio                                                                                    preferredTrackID:kCMPersistentTrackID_Invalid];    //3秒到8秒 则atTime从3秒开始    [b_compositionAudioTrack insertTimeRange:audio_timeRange                                     ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]                                      atTime:start                                       error:nil];        NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:videoAsset];    if ([compatiblePresets containsObject:AVAssetExportPresetMediumQuality]) {                AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]                                               initWithAsset:videoAsset presetName:AVAssetExportPresetPassthrough];        NSURL *furl = outputFileUrl;                exportSession.outputURL = furl;        exportSession.outputFileType = AVFileTypeQuickTimeMovie;        exportSession.shouldOptimizeForNetworkUse= YES;                <span style="color:#ff0000;">//剪辑视频片段 设置timeRange        CMTime start = CMTimeMakeWithSeconds(startTime, videoAsset.duration.timescale);        CMTime duration = CMTimeMakeWithSeconds(endTime - startTime,videoAsset.duration.timescale);        CMTimeRange range = CMTimeRangeMake(start, duration);        exportSession.timeRange = range;</span>                [exportSession exportAsynchronouslyWithCompletionHandler:         ^(void ) {             switch ([exportSession status]) {                 case AVAssetExportSessionStatusFailed: {                     NSLog(@"合成失败：%@",[[exportSession error] description]);                     completionHandle(outputFilePath,NO);                 } break;                 case AVAssetExportSessionStatusCancelled: {                     completionHandle(outputFilePath,NO);                 } break;                 case AVAssetExportSessionStatusCompleted: {                     completionHandle(outputFilePath,YES);                 } break;                 default: {                     completionHandle(outputFilePath,NO);                 } break;             }                      }         ];    }}+ (CGFloat)getMediaDurationWithMediaUrl:(NSString *)mediaUrlStr {        NSURL *mediaUrl = [NSURL URLWithString:mediaUrlStr];    AVURLAsset *mediaAsset = [[AVURLAsset alloc] initWithURL:mediaUrl options:nil];    CMTime duration = mediaAsset.duration;        return duration.value / duration.timescale;}+ (NSString *)getMediaFilePath {        return [NSTemporaryDirectory() stringByAppendingPathComponent:MediaFileName];    }+ (NSString *)fileSavePath{    NSDate *date = [NSDate date];    NSInteger nowInter = (long)[date timeIntervalSince1970];    NSString *fileName = [NSString stringWithFormat:@"output%ld.mp4",(long)nowInter];        NSString *documentsDirectory =[NSHomeDirectory()                                   stringByAppendingPathComponent:@"Documents"];    //最终合成输出路径    NSString *outputFilePath =[documentsDirectory stringByAppendingPathComponent:fileName];    // NSURL   *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];        if([[NSFileManager defaultManager]fileExistsAtPath:outputFilePath])        [[NSFileManager defaultManager]removeItemAtPath:outputFilePath error:nil];    return outputFilePath;}@end

demo地址：http://download.csdn.net/detail/jueyi1127/9611662

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