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POVideo Encoding using AVAssetWriter - CRASHES
 

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    <p>I have a function that is supposed to re-encode a video to a manageable bitrate on iphone/ipad. Here it is: <strong>*<em>UPDATED WORKING CODE, NOW WITH AUDIO! :) *</em></strong></p> <pre><code> -(void)resizeVideo:(NSString*)pathy{ NSString *newName = [pathy stringByAppendingString:@".down.mov"]; NSURL *fullPath = [NSURL fileURLWithPath:newName]; NSURL *path = [NSURL fileURLWithPath:pathy]; NSLog(@"Write Started"); NSError *error = nil; AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:fullPath fileType:AVFileTypeQuickTimeMovie error:&amp;error]; NSParameterAssert(videoWriter); AVAsset *avAsset = [[[AVURLAsset alloc] initWithURL:path options:nil] autorelease]; NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:1280], AVVideoWidthKey, [NSNumber numberWithInt:720], AVVideoHeightKey, nil]; AVAssetWriterInput* videoWriterInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings] retain]; NSParameterAssert(videoWriterInput); NSParameterAssert([videoWriter canAddInput:videoWriterInput]); videoWriterInput.expectsMediaDataInRealTime = YES; [videoWriter addInput:videoWriterInput]; NSError *aerror = nil; AVAssetReader *reader = [[AVAssetReader alloc] initWithAsset:avAsset error:&amp;aerror]; AVAssetTrack *videoTrack = [[avAsset tracksWithMediaType:AVMediaTypeVideo]objectAtIndex:0]; videoWriterInput.transform = videoTrack.preferredTransform; NSDictionary *videoOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange] forKey:(id)kCVPixelBufferPixelFormatTypeKey]; AVAssetReaderTrackOutput *asset_reader_output = [[AVAssetReaderTrackOutput alloc] initWithTrack:videoTrack outputSettings:videoOptions]; [reader addOutput:asset_reader_output]; //audio setup AVAssetWriterInput* audioWriterInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeAudio outputSettings:nil] retain]; AVAssetReader *audioReader = [[AVAssetReader assetReaderWithAsset:avAsset error:&amp;error] retain]; AVAssetTrack* audioTrack = [[avAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]; AVAssetReaderOutput *readerOutput = [AVAssetReaderTrackOutput assetReaderTrackOutputWithTrack:audioTrack outputSettings:nil]; [audioReader addOutput:readerOutput]; NSParameterAssert(audioWriterInput); NSParameterAssert([videoWriter canAddInput:audioWriterInput]); audioWriterInput.expectsMediaDataInRealTime = NO; [videoWriter addInput:audioWriterInput]; [videoWriter startWriting]; [videoWriter startSessionAtSourceTime:kCMTimeZero]; [reader startReading]; dispatch_queue_t _processingQueue = dispatch_queue_create("assetAudioWriterQueue", NULL); [videoWriterInput requestMediaDataWhenReadyOnQueue:_processingQueue usingBlock: ^{ [self retain]; while ([videoWriterInput isReadyForMoreMediaData]) { CMSampleBufferRef sampleBuffer; if ([reader status] == AVAssetReaderStatusReading &amp;&amp; (sampleBuffer = [asset_reader_output copyNextSampleBuffer])) { BOOL result = [videoWriterInput appendSampleBuffer:sampleBuffer]; CFRelease(sampleBuffer); if (!result) { [reader cancelReading]; break; } } else { [videoWriterInput markAsFinished]; switch ([reader status]) { case AVAssetReaderStatusReading: // the reader has more for other tracks, even if this one is done break; case AVAssetReaderStatusCompleted: // your method for when the conversion is done // should call finishWriting on the writer //hook up audio track [audioReader startReading]; [videoWriter startSessionAtSourceTime:kCMTimeZero]; dispatch_queue_t mediaInputQueue = dispatch_queue_create("mediaInputQueue", NULL); [audioWriterInput requestMediaDataWhenReadyOnQueue:mediaInputQueue usingBlock:^ { NSLog(@"Request"); NSLog(@"Asset Writer ready :%d",audioWriterInput.readyForMoreMediaData); while (audioWriterInput.readyForMoreMediaData) { CMSampleBufferRef nextBuffer; if ([audioReader status] == AVAssetReaderStatusReading &amp;&amp; (nextBuffer = [readerOutput copyNextSampleBuffer])) { NSLog(@"Ready"); if (nextBuffer) { NSLog(@"NextBuffer"); [audioWriterInput appendSampleBuffer:nextBuffer]; } }else{ [audioWriterInput markAsFinished]; switch ([audioReader status]) { case AVAssetReaderStatusCompleted: [videoWriter finishWriting]; [self hookUpVideo:newName]; break; } } } } ]; break; case AVAssetReaderStatusFailed: [videoWriter cancelWriting]; break; } break; } } } ]; NSLog(@"Write Ended"); } </code></pre> <p>Unfortunately, if I pass in a video any longer than 2 seconds, the app sucks up memory like crazy and crashes! The code seems fairly simple, but I cannot seem to get it to work!<br> Am I supposed to release the buffer in there somewhere after it is written? I would be most greatful to anyone that has any input.</p>
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    1. COCan you show your releases? You retain a lot of things but I don't see where they're released.
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    2. CO@box86rowh Where do you specify the bitrate? Thanks.
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    3. COCheck this doc out for more settings you can apply: https://developer.apple.com/library/mac/#documentation/AVFoundation/Reference/AVFoundation_Constants/Reference/reference.html
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