Based on a lot of online references, the way to change resolution is using the following code.
NSDictionary * pixelBufferAttr = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:320], kCVPixelBufferWidthKey,
[NSNumber numberWithInt:240], kCVPixelBufferHeightKey,
[NSNumbernumberWithBool:YES],
(id)kCVPixelBufferOpenGLCompatibilityKey,
[NSNumber
numberWithUnsignedInt:kCVPixelFormatType_422YpCbCr8],
(id)kCVPixelBufferPixelFormatTypeKey,
nil];
NSArray *outputsConnected = [mCaptureSession outputs];
QTCaptureVideoPreviewOutput * previewOutput = [outputsConnected objectAtIndex:1];
[previewOutput setDelegate:self];
[previewOutput setPixelBufferAttributes:pixelBufferAttr];
But after changing the resolution, the captureView can see the different, but using code to check the resolution is incorrect.
Does anyone know how to change the device resolution?
Thanks ALL!
Related
On a NSTextField I'm setting a custom font with a size of 140. The text is set to #"28". But as you can clearly see on the image, the text field has plenty of space on top. This only happens with certain type of fonts, not all of them. My question is what information from the font could be affecting the textfield that ends up cropping the text ? (Ascender, Cap Height ?). And if so, can I modify the font file to fix it ?
The baseline will vary between fonts. In addition, there are other metrics that vary. You can work around this problem with NSAttributedString. You could try varying the NSBaselineOffsetAttribute and from within a paragraph setMinimumLineHeight and setMaximumLineHeight. The following is an example. Make sure to create two textField labels and connect their outlets.
self.Label1.stringValue = #"Test Text";
//
// baseline is different for each font!
//
//self.Label2.stringValue = #"Test Text";
NSFont *otherFont = [NSFont fontWithName:#"MarkerFelt-Thin" size:40.0f];
NSNumber *baseline = [[NSNumber alloc] initWithFloat: 5.0f];
NSMutableParagraphStyle *paraStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[paraStyle setParagraphSpacingBefore:20.0f];
[paraStyle setMinimumLineHeight:30.0f];
[paraStyle setMaximumLineHeight:50.0f];
NSDictionary *otherFDict = [NSDictionary dictionaryWithObjectsAndKeys: paraStyle, NSParagraphStyleAttributeName,
otherFont, NSFontAttributeName, baseline, NSBaselineOffsetAttributeName, nil];
NSMutableAttributedString *otherText = [[NSMutableAttributedString alloc] initWithString:#"Test Text" attributes:otherFDict];
self.Label2.attributedStringValue = otherText;
I am trying to build a dictionary which has as dictionary within it (eventually I hope to convert to a JSON). The problem is I am having problems building it.
So far I have this, what it should do is build a small dictionary with keys and add it to a larger dictionary, reset and then load the small dict and then add it to the large one.
NSMutableDictionary *nestedList = [[NSMutableDictionary alloc]init];
NSMutableDictionary *nestedSections = [[NSMutableDictionary alloc] init];
[nestedList addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:46], #"menuHeight",
#"editText", #"menuMethod",
[NSNumber numberWithInt:1], #"menuOption",
nil]];
[nestedSections addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
nestedList, "#Basic",
nil]];
[nestedList removeAllObjects];
[nestedList addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:92], #"menuHeight",
#"sendText", #"menuMethod",
[NSNumber numberWithInt:1], #"menuOption",
nil]];
[nestedSections addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
nestedList, "#Pro",
nil]];
I then hoped to address like so;
NSString *string = [[nestedSections objectForKey:#"Pro"] objectForKey:#"menuMethod"];
NSLog(#"Method is : %#", string);
Log would hope to read sendText
The first dictionary builds fine but as soon as I try and add it to the second t bums out with EXC_BAD_ACCESS
I think it is a memory addressing problem because they are both mutable but I am not sure, maybe nestedList should not be mutable. Any help appreciated.
Ultimately I would like to convert this to a JSON like;
{
"Basic":
{
"menuHeight":"46",
"menuMethod":"editText",
"menuOption":"1",
},
"Pro":
{
"menuHeight":"96",
"menuMethod":"sendText",
"menuOption":"1",
}
}
A. NSMutableDictionary does not copy the values (only the keys). Therefore you add the same dictionary two times and change both (= the one) when removing objects and so on. Beside this in your sample JSON the numbers looks like strings not like numbers. I think, that this is a typo.
B. Adding modern Objective-C for better readability it should look like this:
NSDictionary *basicDictionary =
#{
#"menuHeight" : #46,
#"menuMethod" : "editText",
#"menuOption : #1
}
NSDictionary *proDictionary =
#{
#"menuHeight" : #96,
#"menuMethod" : "sendText",
#"menuOption : #1
}
NSDictionary *nestedSections = #{ #"Pro" : proDictionary, #"Basic" : basicDictionary };
Using the QTKit framework, I'm developing a little app.
In the app, I'm trying to append a movie after a other movie, which in essence is already working (most of the time), but I'm having a little trouble with the appended movie. The movie is which I'm appending to is quite big, like 1920x1080, and the appended movie is usually much smaller, but I never know what size it exactly is. The appended movie sort of stays its own size in the previous 1920x1080 frame, as seen here:
Is there anyone familiar with this? Is there a way I can scale the movie which I need to append to, to the size of the appended movie? There is no reference of such a thing in the documentation.
This is are some relevant methods:
`QTMovie *segmentTwo = [QTMovie movieWithURL:finishedMovie error:nil];
QTTimeRange range = { .time = QTZeroTime, .duration = [segmentTwo duration] };
[segmentTwo setSelection:range];
[leader appendSelectionFromMovie:segmentTwo];
while([[leader attributeForKey:QTMovieLoadStateAttribute] longValue] != 100000L)
{
//wait until QTMovieLoadStateComplete
}
NSDictionary *exportAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], QTMovieExport,
[NSNumber numberWithLong:kQTFileTypeMovie], QTMovieExportType, nil];
NSString *outputFile = [NSString stringWithFormat:#"%#.mov", onderwerp];
NSString *filepath = [[#"~/Desktop" stringByExpandingTildeInPath] stringByAppendingFormat:#"/%#", outputFile];
BOOL succes = [leader writeToFile:filepath withAttributes:exportAttributes error:&theError];
Leader is initialized like this:
NSDictionary *movieAttributes = [NSDictionary dictionaryWithObjectsAndKeys:path, QTMovieFileNameAttribute, [NSNumber numberWithBool:YES], QTMovieEditableAttribute, nil];
leader = [QTMovie movieWithAttributes: movieAttributes error:&error];
This contained all the information I need, although without using the QTKit framework. QTKit - Merge two videos with different width and height?
i need some help for getting my statics work...
I use core data to store my values from user input and each "line" has a time value.
Now i need to calculate some of these values that are in specific time range, lets say the last 30 days.
But i don't know how to do it, i'm a little new to working with date and time rangers.
Can somebody help me out?
kind regards,
Ingemar
You need to use a predicate to filter your data.
NSManagedObjectContext *context; // Assume this exists.
NSEntityDescription *entityDescription; // Assume this exists.
NSDate minDate, maxDate; // Assume these exist.
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:entityDescription];
NSPredicate *setPredicate:predicate = [NSPredicate predicateWithFormat:#"date BETWEEN %#",
[NSArray arrayWithObjects:minDate, maxDate, nil]];
[request setPredicate:predicate];
NSError *error;
NSArray *filteredResult = [context executeFetchRequest:request error:&error];
// Handle error.
[request release];
thanks for your answer. I will try your way.
I found this solution by myself, any concerns about it?
NSTimeInterval aktuellesDatumInSekunden = [aktuellesDatum timeIntervalSinceReferenceDate];
NSTimeInterval vordreissigTagen = [letztedreizigTage timeIntervalSinceReferenceDate];
double dBoluse = 0;
double dWerteKleinerSechzig = 0;
for (TblBolusWerte *ausgabeBoliTag in statistikDataWithPredicate){
NSTimeInterval DatumAusDB = [ausgabeBoliTag.creationTime timeIntervalSinceReferenceDate];
if (DatumAusDB >= vordreissigTagen && DatumAusDB <= aktuellesDatumInSekunden){
I'm trying to create a QTVR movie via QTKit, and I've got all the frames in the movie. However, setting the attributes necessary doesn't seem to be having any effect. For example:
NSNumber *val = [NSNumber numberWithBool:YES];
[fMovie setAttribute:val forKey:QTMovieIsInteractiveAttribute];
val = [NSNumber numberWithBool:NO];
[fMovie setAttribute:val forKey:QTMovieIsLinearAttribute];
If I then get the value of these attributes, they come up as NO and YES, respectively. The movie is editable, so I can't understand what I'm doing wrong here. How can I ensure that the attributes will actually change?
What I do when I want to export a Quicktime movie is something like the following:
NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], QTMovieExport,
[exportSettings objectForKey: #"subtype"], QTMovieExportType,
[exportSettings objectForKey: #"manufacturer"], QTMovieExportManufacturer,
[exportSettings objectForKey: #"settings"], QTMovieExportSettings,
nil];
BOOL didSucceed = [movie writeToFile: tmpFileName withAttributes:dictionary error: &error];
Those attributes are documented as things you can read but not write. However, you might be able to set them when you create the movie, with initWithAttributes:error:.