Question

在这里，我需要生成视频，选择多个图像，选择音乐。在此我可以选择多个图像并为这些图像生成视频通过将所选图像保存在阵列中并生成视频。但我的问题是，生成的视频应该存在在下一个视图中，它也应保存在CameraRoll中。但生成的视频将转到文档并保存在那里。有人帮我..

我关注此链接 https://github.com/caferrara/img-to-video

我的代码：

 NSError *error = nil;
 NSFileManager *fileMgr = [NSFileManager defaultManager];
 NSString *documentsDirectory = [NSHomeDirectory()
 stringByAppendingPathComponent:@"Documents"];
 NSString *videoOutputPath = [documentsDirectory      stringByAppendingPathComponent:@"test_output.mp4"];
 if ([fileMgr removeItemAtPath:videoOutputPath error:&error] != YES)
    NSLog(@"Unable to delete file: %@", [error localizedDescription]);
   CGSize imageSize = CGSizeMake(400, 200);
   NSUInteger fps = 30;
  NSArray* imagePaths = [[NSBundle mainBundle]   pathsForResourcesOfType:@"jpg" inDirectory:nil];
 self.chosenImages = [[NSMutableArray alloc]   initWithCapacity:imagePaths.count];
 NSLog(@"-->imageArray.count= %i", self.chosenImages.count);
  for (NSString* path in imagePaths)
  {
    [self.chosenImages addObject:[UIImage imageWithContentsOfFile:path]];

 }

 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];
 [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 self.chosenImages)
{
    //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,%lu)",frameCount,(unsigned long)[self.chosenImages 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(@"**************************************************");

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



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

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

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

// 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];

   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.outputFileType = @"public.mpeg-4";
  //NSLog(@"support file types= %@", [_assetExport supportedFileTypes]);
  _assetExport.outputURL = outputFileUrl;

  [_assetExport exportAsynchronouslyWithCompletionHandler:
   ^(void ) {
     //[self saveVideoToAlbum:outputFilePath];
   }
   ];

   NSLog(@"DONE.....outputFilePath--->%@", outputFilePath);

Answer 1

您还可以通过文档路径在下一个屏幕中提取视频。

您可以通过执行以下代码将视频从Documents文件夹存储到PhotoLibrary。

ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init];
[assetLibrary writeVideoAtPathToSavedPhotosAlbum:DocumentPath completionBlock:^(NSURL *assetURL, NSError *error){
  If(error == nil){
   // Saved successfully
  }
}];

将生成的视频导入下一个视图并将其保存到iOS中的相机胶卷

1 个答案: