iOS how to export video from PHAsset faster? - ios

Question

I need to upload video from the album, so I use Phasset to fetch the video source, I am going to export video from PHAsset to sandbox, in which the video will be compressed by different rate. I found the duration of export video too long in high rate. so I am looking for a faster way to export video but without lose the video's rate.
here is my video, 500M, takes me about a half minute to export in the highest rate.
or is there any other way to upload the video in album directly without export?
here is my way to export:
PHVideoRequestOptions* options = [[PHVideoRequestOptions alloc] init];
options.version = PHVideoRequestOptionsVersionCurrent;
options.deliveryMode = PHVideoRequestOptionsDeliveryModeHighQualityFormat;
options.networkAccessAllowed = YES;
[[PHImageManager defaultManager] requestAVAssetForVideo:asset options:options resultHandler:^(AVAsset* avasset, AVAudioMix* audioMix, NSDictionary* info){
// NSLog(#"Info:\n%#",info);
AVURLAsset *videoAsset = (AVURLAsset*)avasset;
// NSLog(#"AVAsset URL: %#",myAsset.URL);
[self startExportVideoWithVideoAsset:videoAsset presetName:presetName success:success failure:failure];
}];
- (void)startExportVideoWithVideoAsset:(AVURLAsset *)videoAsset presetName:(NSString *)presetName success:(void (^)(NSString *outputPath))success failure:(void (^)(NSString *errorMessage, NSError *error))failure {
// Find compatible presets by video asset.
NSArray *presets = [AVAssetExportSession exportPresetsCompatibleWithAsset:videoAsset];
// Begin to compress video
// Now we just compress to low resolution if it supports
// If you need to upload to the server, but server does't support to upload by streaming,
// You can compress the resolution to lower. Or you can support more higher resolution.
if ([presets containsObject:presetName]) {
AVAssetExportSession *session = [[AVAssetExportSession alloc] initWithAsset:videoAsset presetName:presetName];
NSDateFormatter *formater = [[NSDateFormatter alloc] init];
[formater setDateFormat:#"yyyy-MM-dd-HH:mm:ss-SSS"];
// NSLog(#"video outputPath = %#",outputPath);
NSString *outputPath = [NSString stringWithFormat:#"%#output-%#.mp4",
[UserCenterUtiles TempVideoPath],
[formater stringFromDate:[NSDate date]]];
session.outputURL = [NSURL fileURLWithPath:outputPath];
// Optimize for network use.
session.shouldOptimizeForNetworkUse = true;
NSArray *supportedTypeArray = session.supportedFileTypes;
if ([supportedTypeArray containsObject:AVFileTypeMPEG4]) {
session.outputFileType = AVFileTypeMPEG4;
} else if (supportedTypeArray.count == 0) {
if (failure) {
failure(#"No supported file types", nil);
}
NSLog(#"No supported file types");
return;
} else {
session.outputFileType = [supportedTypeArray objectAtIndex:0];
}
if (![[NSFileManager defaultManager] fileExistsAtPath:[NSHomeDirectory() stringByAppendingFormat:#"/tmp"]]) {
[[NSFileManager defaultManager] createDirectoryAtPath:[NSHomeDirectory() stringByAppendingFormat:#"/tmp"] withIntermediateDirectories:YES attributes:nil error:nil];
}
AVMutableVideoComposition *videoComposition = [self fixedCompositionWithAsset:videoAsset];
if (videoComposition.renderSize.width) {
session.videoComposition = videoComposition;
}
// Begin to export video to the output path asynchronously.
[session exportAsynchronouslyWithCompletionHandler:^(void) {
dispatch_async(dispatch_get_main_queue(), ^{
switch (session.status) {
case AVAssetExportSessionStatusUnknown: {
NSLog(#"AVAssetExportSessionStatusUnknown");
} break;
case AVAssetExportSessionStatusWaiting: {
NSLog(#"AVAssetExportSessionStatusWaiting");
} break;
case AVAssetExportSessionStatusExporting: {
NSLog(#"AVAssetExportSessionStatusExporting");
} break;
case AVAssetExportSessionStatusCompleted: {
NSLog(#"AVAssetExportSessionStatusCompleted");
if (success) {
success(outputPath);
}
} break;
case AVAssetExportSessionStatusFailed: {
NSLog(#"AVAssetExportSessionStatusFailed");
if (failure) {
failure(#"export failed", session.error);
}
[[NSNotificationCenter defaultCenter] postNotificationName:#"XMVideoOutputNoticeKey" object:[NSNumber numberWithFloat:session.progress]];
} break;
case AVAssetExportSessionStatusCancelled: {
NSLog(#"AVAssetExportSessionStatusCancelled");
if (failure) {
failure(#"export canceled", nil);
}
[[NSNotificationCenter defaultCenter] postNotificationName:#"XMVideoOutputNoticeKey" object:[NSNumber numberWithFloat:session.progress]];
} break;
default: break;
}
});
}];
} else {
if (failure) {
NSString *errorMessage = [NSString stringWithFormat:#"the device not support export"];
failure(errorMessage, nil);
}
}
}