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    <p>I ended up abandoning the "read while it's written" approach in favor of a manual chunking approach where I call <code>finishWriting</code> every 5 seconds on a background thread. I was able to drop a negligible number of frames using a method <a href="https://stackoverflow.com/questions/3444791/streaming-video-from-an-iphone?lq=1#comment7593528_3484950">originally described here</a>:</p> <pre><code>- (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 &amp;&amp; self.readyToRecordVideo) { NSError *error = nil; self.queuedAssetWriter = [[AVAssetWriter alloc] initWithURL:[self newMovieURL] fileType:(NSString *)kUTTypeMPEG4 error:&amp;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"); } }); } </code></pre> <p>Full source code: <a href="https://github.com/chrisballinger/FFmpeg-iOS-Encoder/blob/master/AVSegmentingAppleEncoder.m" rel="nofollow noreferrer">https://github.com/chrisballinger/FFmpeg-iOS-Encoder/blob/master/AVSegmentingAppleEncoder.m</a></p>
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