Iphone SDK,Create a Video from UIImage - iphone

Question

i needs to create a video from the image selected.
i have code it shoudl work but its giving error while appending buffer.
This is how both type of images has been saved.
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)img editingInfo:(NSDictionary *)editInfo
{
// NSLog(#"Came From Here");
imgv.image = img;
AppDelegate *app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
app.imgmain = img;
[self dismissModalViewControllerAnimated:YES];
RecordVoice *rec = [[RecordVoice alloc] initWithNibName:#"RecordVoice" bundle:nil];
rec.hidesBottomBarWhenPushed = YES;
// rec.img.image = img;
[self.navigationController pushViewController:rec animated:YES];
//[self presentModalViewController:rec animated:YES];
[rec release];
// flag =#"yes";
// need to show the upload image button now
// [username, ititle resignFirstResponder];
}
on the other view controller i am showing this image on a uiimage view.
and on button click i am converting that image to video with this code.
-(void)createVideoFile
{
NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectoryPath error:nil];
for (NSString *tString in dirContents) {
if ([tString isEqualToString:#"test.mp4"])
{
[[NSFileManager defaultManager]removeItemAtPath:[NSString stringWithFormat:#"%#/%#",documentsDirectoryPath,tString] error:nil];
}
}
NSString *nfile = [documentsDirectoryPath stringByAppendingPathComponent:#"test.mp4"];
AVURLAsset * urlAsset = [AVURLAsset URLAssetWithURL:recordedTmpFile options:nil];
NSLog(#"Write Started");
NSError *error = nil;
CGSize size = img.image.size; //CGSizeMake(320, 480);
NSLog(#"Write Started");
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL fileURLWithPath:nfile] fileType:AVFileTypeQuickTimeMovie
error:&error];
NSParameterAssert(videoWriter);
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:size.width], AVVideoWidthKey,
[NSNumber numberWithInt:size.height], AVVideoHeightKey,
nil];
AVAssetWriterInput* videoWriterInput = [[AVAssetWriterInput
assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings] retain];
AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput
sourcePixelBufferAttributes:nil];
NSParameterAssert(videoWriterInput);
NSParameterAssert([videoWriter canAddInput:videoWriterInput]);
videoWriterInput.expectsMediaDataInRealTime = YES;
[videoWriter addInput:videoWriterInput];
//Start a session:
[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
CVPixelBufferRef buffer = NULL;
//convert uiimage to CGImage.
int frameCount = 0;
buffer = [self pixelBufferFromCGImage:[img.image CGImage] andSize:size];
BOOL append_ok = NO;
int j = 0;
while (!append_ok && j < 30)
{
if (adaptor.assetWriterInput.readyForMoreMediaData)
{
printf("appending %d attemp %d\n", frameCount, j);
CMTime frameTime = urlAsset.duration;//CMTimeMake(frameCount,(int32_t) 10);
append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
//if(buffer)
// CVBufferRelease(buffer);
[NSThread sleepForTimeInterval:0.05];
}
else
{
printf("adaptor not ready %d, %d\n", frameCount, j);
[NSThread sleepForTimeInterval:0.1];
}
j++;
}
if (!append_ok) {
printf("error appending image %d times %d\n", frameCount, j);
}
frameCount++;
[videoWriterInput markAsFinished];
[videoWriter finishWriting];
[self CompileFilesToMakeMovie];
[altv dismissWithClickedButtonIndex:0 animated:YES];
[altv release];
NSLog(#"Write Ended");
}
But this is not working...
i am stuck can anyone please help me in this???? :(

Answer 1

i have figured out the problem.
if we use image with big size it wont work. like the pictures taken from camera app has a big size.
so i am compressing it to low level and then it works..
i didnt yet got why its working like but got the solution