Near Real Time Video Upload from iPhone

Question

I am trying to find the best way to upload video from an iPhone (iOS5) as fast as possible - real time if possible.

I found this previous question and answer very useful

Answer 1

2) Here's how I chunked the files without dropping too many frames:

- (void) segmentRecording:(NSTimer*)timer {
    AVAssetWriter *tempAssetWriter = self.assetWriter;
    AVAssetWriterInput *tempAudioEncoder = self.audioEncoder;
    AVAssetWriterInput *tempVideoEncoder = self.videoEncoder;
    self.assetWriter = queuedAssetWriter;
    self.audioEncoder = queuedAudioEncoder;
    self.videoEncoder = queuedVideoEncoder;
    //NSLog(@"Switching encoders");

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
        [tempAudioEncoder markAsFinished];
        [tempVideoEncoder markAsFinished];
        if (tempAssetWriter.status == AVAssetWriterStatusWriting) {
            if(![tempAssetWriter finishWriting]) {
                [self showError:[tempAssetWriter error]];
            }
        }
        if (self.readyToRecordAudio && self.readyToRecordVideo) {
            NSError *error = nil;
            self.queuedAssetWriter = [[AVAssetWriter alloc] initWithURL:[self newMovieURL] fileType:(NSString *)kUTTypeMPEG4 error:&error];
            if (error) {
                [self showError:error];
            }
            self.queuedVideoEncoder = [self setupVideoEncoderWithAssetWriter:self.queuedAssetWriter formatDescription:videoFormatDescription bitsPerSecond:videoBPS];
            self.queuedAudioEncoder = [self setupAudioEncoderWithAssetWriter:self.queuedAssetWriter formatDescription:audioFormatDescription bitsPerSecond:audioBPS];
            //NSLog(@"Encoder switch finished");

        }
    });
}

https://github.com/chrisballinger/FFmpeg-iOS-Encoder/blob/master/AVSegmentingAppleEncoder.m

3) Here's a script to concatenate the files on the server

import glob
import os
run = os.system  # convenience alias


files = glob.glob('*.mp4')
out_files = []

n = 0
for file in files:
    out_file = "out-{0}.ts".format(n)
    out_files.append(out_file)
    full_command = "ffmpeg -i {0} -f mpegts -vcodec copy -acodec copy -vbsf h264_mp4toannexb {1}".format(file, out_file)
    run(full_command)
    n += 1

out_file_concat = ''
for out_file in out_files:
    out_file_concat += ' {0} '.format(out_file)

cat_command = 'cat {0} > full.ts'.format(out_file_concat)
print cat_command
run(cat_command)
run("ffmpeg -i full.ts -f mp4 -vcodec copy -acodec copy -absf aac_adtstoasc full.mp4")

https://github.com/chrisballinger/FFmpeg-iOS-Encoder/blob/master/concat-mp4.py