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POhow to add text on video in iPhone
 

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  1. POhow to add text on video in iPhone
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    <p>I want to add a text or string ON the video being played by MPMoviePlayerViewController in a way that it becomes part of the video being played. So that, when I post that video on Facebook or Twitter the text must be shown above the video.</p> <p>For this I have tried getting all the frames of the video and then write text on each of those frames and then again make a video of all those frames. But this way, I am getting memory issues and it crashes on the device.</p> <pre><code> - (NSArray*)getVideoFramesFromMovieController:(MPMoviePlayerViewController*)mpMoviePlayerVC { NSLog(@"Getting frames from a video asset."); // videoFrames = [NSMutableArray array]; NSMutableArray *videoFrames = [NSMutableArray array]; for(float i= 0; i &lt;= mpMoviePlayerVC.moviePlayer.duration; ) { UIImage *singleFrameImage = [mpMoviePlayerVC.moviePlayer thumbnailImageAtTime:i timeOption:MPMovieTimeOptionExact]; [videoFrames addObject:singleFrameImage]; NSLog(@"Got frame number : %d",[videoFrames count]); i = i + (1/self.frameRate) ; //frame capturing duration i.e. 15fps //self.frameRate } NSLog(@"Total frames: %d",[videoFrames count]); return [NSArray arrayWithArray:videoFrames]; } </code></pre> <p>Method above gives me all the frames, i write a text on all those text, say "hello", and then make a video of all these frames.</p> <pre><code> -(void)writeImageAsMovie:(NSArray *)array toPath:(NSString*)path size:(CGSize)size { NSLog(@"Inside writeImageAsMovie method."); NSError *error = nil; AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL: [NSURL fileURLWithPath:path] fileType:AVFileTypeMPEG4 error:&amp;error]; NSParameterAssert(videoWriter); NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:size.width], AVVideoWidthKey, [NSNumber numberWithInt:size.height], AVVideoHeightKey, nil]; AVAssetWriterInput* writerInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings] retain]; AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput sourcePixelBufferAttributes:nil]; NSParameterAssert(writerInput); NSParameterAssert([videoWriter canAddInput:writerInput]); [videoWriter addInput:writerInput]; //Start a session: [videoWriter startWriting]; [videoWriter startSessionAtSourceTime:kCMTimeZero]; dispatch_queue_t dispatchQueue = dispatch_queue_create("mediaInputQueue", NULL); int __block frame = 0; [writerInput requestMediaDataWhenReadyOnQueue:dispatchQueue usingBlock:^{ while ([writerInput isReadyForMoreMediaData]) { NSLog(@"Total frames to be written: %d",[array count]); if(++frame &gt;= [array count]) //total frames { [writerInput markAsFinished]; [videoWriter finishWriting]; [videoWriter release]; break; } CVPixelBufferRef buffer = (CVPixelBufferRef)[self pixelBufferFromCGImage:[[array objectAtIndex:frame]CGImage] andSize:size]; if (buffer) { if(![adaptor appendPixelBuffer:buffer withPresentationTime:CMTimeMake(frame, self.frameRate)]) NSLog(@"FAIL"); else NSLog(@"Success:%d", frame); CFRelease(buffer); } } }]; NSLog(@"outside for loop"); [self performSelector:@selector(waitTillVideoFinishes) withObject:nil afterDelay:20.0]; } </code></pre> <p>It is working fine on the mac, but crashes on the device because of memory issues.</p> <p>I'hv also tried various ways to watermark the text on the video but could not get through. Thanks in advance.</p>
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    1. CO"writing" on a video like this would mean decompressing the necessary frames to bitmaps, drawing the text, then recompressing the video. this is not a cheap operation, particularly on a resource constrained device like a phone.
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      1. POhow to add text on video in iPhone
      1. USMarc B
    2. COIs there any other efficient way to achieve this ?
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      1. POhow to add text on video in iPhone
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    3. COWhy do you need this text to be a permanent part of the video, especially when you're doing it client-side? If it was a security watermark, it should be done on the server. If you're simply doing (say) a subtitle, then have ios float some text over the video, much as youtube's ads and annotations do.
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      1. POhow to add text on video in iPhone
      1. USMarc B
 

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