iOS上視訊剪輯片段和新增背景音樂
阿新 • • 發佈：2019-02-14
最近在研究剪輯視訊，目前知道了怎麼剪輯視訊片段和新增背景音樂，不多說了，程式碼寫的很清楚，如下：
1 新增背景音樂呼叫
[PSJVideoEditor cropWithVideoUrlStr:_videoUrl audioUrl:_audioUrl start:3 end:8 isOrignalSound:isOrignalSound completion:^(NSString *outPath, BOOL isSuccess) { if (isSuccess) { _videoUrl = [NSURL URLWithString:outPath]; } }];
2 剪輯視訊片段呼叫
[PSJVideoEditor addBackgroundMiusicWithVideoUrlStr:_videoUrl audioUrl:_audioUrl start:3 end:8 isOrignalSound:isOrignalSound completion:^(NSString *outPath, BOOL isSuccess) { if (isSuccess) { _videoUrl = [NSURL URLWithString:outPath]; } }];
3 附上原始碼
#import <Foundation/Foundation.h> #import <UIKit/UIKit.h> @interface PSJVideoEditor : NSObject /*! @method @brief 視訊新增音訊 @discussion @param videoUrl 視訊URL @param audioUrl 音訊URL @param startTime 音訊插入開始時間 @param startTime 音訊插入結束時間 @param isOrignalSound 是否保留原聲 @param completionHandle 完成回撥 */ + (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 剪輯視訊 @discussion @param videoUrl 視訊URL @param audioUrl 音訊URL @param startTime 剪輯開始時間 @param startTime 剪輯結束時間 @param isOrignalSound 是否保留原聲 @param completionHandle 完成回撥 */ + (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
{
//聲音來源路徑（最終混合的音訊）
NSURL *audio_inputFileUrl = audioUrl;
//視訊來源路徑
NSURL *video_inputFileUrl = videoUrl;
NSString *outputFilePath = [PSJVideoEditor fileSavePath];
NSURL *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
CMTime nextClipStartTime = kCMTimeZero;
//建立可變的音訊視訊組合
AVMutableComposition* mixComposition =[AVMutableComposition composition];
//視訊採集
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) {
//視訊聲音採集(也可不執行這段程式碼不採集視訊音軌，合併後的視訊檔案將沒有視訊原來的聲音)
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;"> //音樂聲音採集
AVURLAsset* audioAsset =[[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];
//CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);//聲音長度擷取範圍==視訊長度
AVMutableCompositionTrack*b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio
preferredTrackID:kCMPersistentTrackID_Invalid];
//3秒到8秒 則atTime從3秒開始
[b_compositionAudioTrack insertTimeRange:audio_timeRange
ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]
atTime:start
error:nil];</span>
//建立一個輸出
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(@"合成失敗：%@",[[_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;
//視訊來源路徑
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;
//建立可變的音訊視訊組合
AVMutableComposition* mixComposition =[AVMutableComposition composition];
//視訊採集
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) {
//視訊聲音採集(也可不執行這段程式碼不採集視訊音軌，合併後的視訊檔案將沒有視訊原來的聲音)
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];
}
//音樂聲音採集
AVURLAsset* audioAsset =[[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];
//CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);//聲音長度擷取範圍==視訊長度
AVMutableCompositionTrack*b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio
preferredTrackID:kCMPersistentTrackID_Invalid];
//3秒到8秒 則atTime從3秒開始
[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;">//剪輯視訊片段 設定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(@"合成失敗：%@",[[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"];
//最終合成輸出路徑
NSString *outputFilePath =[documentsDirectory stringByAppendingPathComponent:fileName];
// NSURL *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
if([[NSFileManager defaultManager]fileExistsAtPath:outputFilePath])
[[NSFileManager defaultManager]removeItemAtPath:outputFilePath error:nil];
return outputFilePath;
}
@end