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Technical Q&As are short question and answer formatted pages that provide answers to questions frequently received at Apple Developer Technical Support.

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Checking for the Printer Driver (HTML)
Deprecated - DV42: Describes a legacy Mac OS technique avoiding system hangs when using serial drivers on USB systems.
Printing 2000-06-19
Combinations of cupsColorSpace, cupsColorOrder and cupsBitsPerColor values supported by Mac OS X (HTML)
QA1368: Table of supported combinations of cupsColorSpace, cupsColorOrder and cupsBitsPerColor values supported by Mac OS X.
Printing 2005-08-10
Drawing a Path Multiple Times (HTML)
QA1047: Explains that path drawing operations consume the path.
Printing 2001-07-02
Gathering all PostScript Printer Descriptions (PPDs) (HTML)
QA1529: Describes a work around for an issue in PMCopyAvailablePPDs on Mac OS X 10.4 and below
Printing 2008-08-08
Generating a Non-Maskable Interrupt (NMI) (HTML) (日本語 HTML)
QA1264: Explains how to generate a non-maskable interrupt (NMI) on modern Macintosh systems.
Printing 2008-10-13
Getting a Packet Trace (HTML) (日本語 HTML)
QA1176: Lists tools available for looking at the network packets on the wire.
Printing 2008-06-03
How do I use PMSessionGetGraphicsContext to get a CGContextRef? (HTML) (日本語 HTML)
Deprecated - QA1216: Describes how to use PMSessionSetDocumentFormatGeneration and PMSessionGetGraphicsContext to get a CGContextRef for printing.
Printing 2003-02-25
How to measure CG text (HTML)
QA1051: Explains how to measure Core Graphics text.
Printing 2007-08-02
Mixing link-local IP addresses and routable IP addresses (HTML)
QA1357: Explains how to enable communication between devices with link-local addresses and devices with routable addresses.
Printing 2005-07-06
New PPD keywords available in Mac OS X version 10.3 (HTML)
QA1352: Describes the new PPD keywords available for CUPS filters in Mac OS X 10.3.
Printing 2004-05-26
Printer Queue vs. Printer Name (HTML)
QA1407: Explains the difference between a printer queue and a printer name.
Printing 2007-04-26
Quartz 2D Interpolation (HTML) (日本語 HTML)
QA1186: Explains how to control Quartz 2D's image interpolation.
Printing 2002-10-29
Quartz 2D Thread Safety (HTML) (日本語 HTML)
QA1238: Explains the thread-safety issues for the Quartz 2D API.
Printing 2003-02-25
Retain Counts of io_object_t Objects in IOKit.framework (HTML) (日本語 HTML)
QA1195: Distinguishes between the retain counts of an I/O Kit kernel object and its io_object_t user space proxy.
Printing 2008-09-24
Saving the current Core Graphics Path (HTML)
QA1056: Explains that the Core Graphics save and restore GState APIs do not affect the path.
Printing 2001-10-02
Tioga PostScript Printing Plugins in Mac OS X 10.2 (HTML) (日本語 HTML)
QA1085: Why Tioga printing plugins for PostScript printing aren't called on Mac OS X 10.2 and later.
Printing 2003-07-14
Turning Off Core Graphics Clipping (HTML)
QA1050: Explains how to clear the clipping path for a CGContext.
Printing 2001-07-02
Unexpected CG state changes (HTML)
QA1045: Explains why the Core Graphics drawing state sometimes changes for no apparent reason.
Printing 2001-07-02
Using PPD constraints with Paper Sizes (HTML)
QA1603: Describes the requirements for using PPD Constraints to constrain options against paper size.
Printing 2008-08-08
Why does logging keep my Printer Module from working? (HTML) (日本語 HTML)
Deprecated - QA1182: Describes some problems with standard printf logging in a Printer Module on Jaguar.
Printing 2002-11-06
Why don't all of my PDE localizations show up in all applications? (HTML) (日本語 HTML)
QA1185: Explains why some PDE localizations might not appear in all applications.
Printing 2002-10-16
48 bit & 64 bit Pixel Format support in QuickTime (HTML) (日本語 HTML)
QA1114: Discusses QuickTime's support for pixel formats with more than 8 bits per channel.
QuickTime 2002-02-07
Accessing Decompressed Images (HTML)
QTMTB27: Demonstrates the use of a transfer procedure to access a decompressed image and manipulate it prior to display.
QuickTime 1995-05-01
Adding a movie reference to a movie (HTML)
QA1376: Demonstrates how to add a reference for a movie to another movie
QuickTime 2004-09-16
Adding metadata to a QuickTime movie using the QuickTime MetaData APIs (HTML)
QA1515: Adding metadata to a QuickTime movie using the QuickTime MetaData APIs
QuickTime 2008-08-08
Adding metadata to an iTunes file using the QuickTime Metadata APIs (HTML)
QA1508: How to add metadata to a movie using the QuickTime Metadata APIs
QuickTime 2007-02-14
Adding QuickTime Movie Data to Non-QuickTime Files (HTML)
QTMTB31: Describes how to embed QuickTime movies into files, and play back on Windows or Mac.
QuickTime 1995-05-01
Adding Unicode characters to Text Media in a Text Track (HTML)
QA1400: Describes how to add Unicode characters to text media in a text track
QuickTime 2005-09-01
Adjusting the movie brightness (HTML)
QA1382: Demonstrates how to adjust the brightness of a movie for playback.
QuickTime 2004-09-16
AudioChannelLayout - What's the Audio Channel Order when the Layout has a Channel Bitmap? (HTML)
QA1638: Explains the audio channel order when a channel layout is tagged as kAudioChannelLayoutTag_UseChannelBitmap.
QuickTime 2009-04-12
Available FireWire Isochronous Bandwidth (HTML)
QA1356: Discusses attempting to "pre-flight" an isochronous bandwidth allocation request by reading the currently available bandwidth.
QuickTime 2004-07-07
Avoiding Pauses When Looping Audio files with QuickTime (HTML)
QA1371: Demonstrates how to avoid pauses when looping audio files with QuickTime
QuickTime 2004-09-08
Base-Derived async image codecs must implement ImageCodecQueueStarting and ImageCodecQueueStopping (HTML) (日本語 HTML)
QA1157: Describes why base-derived codecs that set canAsync must implement ImageCodecQueueStarting and ImageCodecQueueStopping.
QuickTime 2002-07-09
Batch Exporting movie sound tracks with ConvertMovieToFile() (HTML)
QTMTB62: Explains how to configure ConvertMovieToFile to use the same configuration information for more than one call.
QuickTime 2000-09-05
BeginMediaEdits -2050 badDataRefIndex error after calling NewMovie (HTML)
QTMTB58: Describes reasons why BeginMediaEdits would return the -2050 badDataRefIndex error code during a media-editing session.
QuickTime 2000-09-05
Calculating the static video frame rate of a QuickTime movie. (HTML) (日本語 HTML)
QA1262: Calculating the static video frame rate of a QuickTime movie.
QuickTime 2008-08-06
Calling InitializeQTML from DLL Main (HTML) (日本語 HTML)
QTW89: Don't do anything significant in your QuickTime 3 for Windows DLL Main procedure.
QuickTime 1998-09-21
Capturing a real-time movie stream (HTML)
QA1535: Capturing real-time movie streams
QuickTime 2007-07-30
Checking For Presence of QuickTime 3 for Windows (HTML) (日本語 HTML)
QTW88: Programatically checking for the presence of QuickTime 3 for Windows.
QuickTime 1998-09-21
Choosing the Position Where a Movie is Pasted (HTML)
QTMTB26: Explains how the position of a pasted movie is determined and shows how to force a given location.
QuickTime 1995-05-01
Component Definitions (HTML)
QTMCC14: Discusses the differences between components, component instances, component storage, and component RefCons.
QuickTime 2000-09-22
Compressed and Uncompressed Samples in the Same Track (HTML)
QTMTB43: Recommends not to mix compressed and uncompressed data samples into the same sound track.
QuickTime 1995-08-01
Compression Sequence APIs - codecErr returned when compressing with H.264 (HTML)
QA1470: Describes why ICM Compression Sequence APIs cannot be used to encode to H.264
QuickTime 2006-11-15
Compression Sessions - Configuring codec quality settings (HTML)
QA1444: Discusses how to set encoding quality for a Compression Sequence
QuickTime 2005-10-17
Compression Sessions - Configuring options using the Standard Compression dialog (HTML)
QA1456: Discusses how to configure Compression Session options using Standard Compression dialog.
QuickTime 2006-01-12
Compression Sessions - Enabling muti-pass encoding (HTML)
QA1450: Describes how to enable multi-pass encoding when using ICM compression sessions.
QuickTime 2006-01-12
Compression Sessions - Multipass encoding and the pass mode flags (HTML)
QA1457: Discusses how the pass mode flags work when performing multipass compression operations.
QuickTime 2006-10-02
Compression Sessions - Temporal compression options (HTML)
QA1455: Discusses the temporal compression option as it relates to quality and other compression session options.
QuickTime 2006-01-12
CompressSequenceBegin & Ethernet in QuickTime (HTML)
QTICM13: Describes resolving an issue with missing ImageDescription when sending compressed images over Ethernet using CompressSequenceBegin.
QuickTime 1995-05-01
ConvertMovieToFile unexpected results (HTML) (日本語 HTML)
QTMTB51: Explains why white frames can occur in a movie that was saved using ConvertMovieToFile.
QuickTime 1999-06-14
Core Video - Available Pixel Formats (HTML)
QA1501: Discusses how to determine all the pixel format types and format descriptions known to Core Video.
QuickTime 2007-01-23
Correct Time Values (HTML)
QTMTB32: Demonstrates finding correct time values for GetMoviePict to get all the frames of a QuickTime movie.
QuickTime 1995-05-01
Correction to SetMediaDataRef, short, not pointer (HTML)
QTMTB44: Makes a correction to the description of SetMediaDataRef in the QT2.0 CD.
QuickTime 1995-08-01
couldNotResolveDataRef (-2000) returned from DataHSetDataRef and OpenADataHandler (HTML) (日本語 HTML)
QA1116: Describes why DataHSetDataRef and OpenADataHandler may return a couldNotResolveDataRef error in the writing case.
QuickTime 2002-02-07
CreatePortAssociation And WM_QUERYNEWPALETTE Message (HTML) (日本語 HTML)
QTW91: Activating your custom palette under QuickTime 3 for Windows by calling NSetPalette and ActivatePalette.
QuickTime 1998-09-21
Creating a Movie from Movie Data in Memory (HTML)
QA1341: Describes how to create a movie from movie data in memory.
QuickTime 2006-03-21
Creating Apple TV Media Files Containing Dolby Digital Professional AC-3 Audio (HTML)
QA1604: Discusses how to create media files containing AC-3 audio for Apple TV using Compressor and QTKit.
QuickTime 2008-05-19
Creating Core Audio Format (.caf) Files (HTML)
QA1534: Describes how to use afconvert to create .caf files
QuickTime 2009-01-07
Creating Sample Descriptor Atoms for a Non-Mac Device (HTML)
QTPC06: Lists a reference for information on QuickTime atoms and their formats.
QuickTime 1995-08-01
Creating Sub GWorlds using QTNewGWorldFromPtr (HTML)
QA1014: Using QTNewGWorldFromPtr to create sub GWorlds which reference the pixel data of other GWorlds.
QuickTime 2001-03-20
Creating Thumbnail PICTs (HTML)
QTICM08: Describes transforming the generic icons of QuickTime PICT-created files into thumbnail icons of these PICTs.
QuickTime 1995-05-01
Creating track references when editing movies (HTML)
QTMTB61: Explains how to use the InsertTrackSegment function to copy a track reference rather than the actual media.
QuickTime 2000-09-05
Decompressing IMA WAVE files (HTML)
QTMCC11: Describes how to use the Sound Manager to decompress and play Window's Microsoft ADPCM-compressed WAVE files.
QuickTime 1998-10-19
Decompressing MP3 (HTML)
QTMCC15: Discusses decompressing an MP3 file into a buffer using SoundConverter APIs.
QuickTime 2000-09-22
Decompression Sessions - Setting codec accuracy and field mode (HTML)
QA1460: Describes how to set codec accuracy and field mode options when creating a decompression sessions.
QuickTime 2006-01-12
Derived Media Handler Components Update (HTML) (日本語 HTML)
QTMCC08: Gives practical limits for data transfer rates under QuickTime 2.5.
QuickTime 1996-08-21
Determining QuickDrawVideo Media Pixel Depth (HTML)
QTMTB17: Demonstrates how to retrieve the pixel depth of a QuickTime video media or movie.
QuickTime 1995-05-01
Determining required components for QuickTime movies (HTML)
QA1093: Shows how to determine if a given QuickTime movie requires a component that's not currently installed on the system.
QuickTime 2001-11-07
Developing a QuickTime Musical Instrument (HTML)
Deprecated - QTMA05: Explains resolving the lack of QuickTime 2.0 API support for creating new music components.
QuickTime 1995-05-01
Difference between using Restart or Shut Down in the Finder's Special menu in Open Firmware (HTML) (日本語 HTML)
HW47: Explains the differences between using Restart or Shut Down on Open Firmware
QuickTime 1999-02-15
Disabling QuickTime Error Dialogs When Opening or Tasking a Movie (HTML) (日本語 HTML)
QA1164: How to disable QuickTime error dialogs which may be presented when opening or tasking a movie.
QuickTime 2003-03-20
DV Codec settings and performance (HTML) (日本語 HTML)
QA1149: Discusses the difference between compression quality, decompression quality, and performance with the DV codec.
QuickTime 2004-01-20
Dynamically registering a bundled component (HTML)
QA1083: Describes how to dynamically register a Component which resides in an Application bundle.
QuickTime 2004-06-07
Endian Concerns When Playing 'snd ' Resources (HTML)
QTW97: Use the Resource Manager to avoid byte-swapping 'snd ' resources before playing under Windows
QuickTime 1999-11-08
Exporting TIFF files in little-endian format (HTML)
QA1044: Explains how to export a TIFF file in little-endian format.
QuickTime 2001-06-26
Extracting DV Fields using QTNewGWorldFromPtr (HTML)
QA1017: Describes using QTNewGWorldFromPtr to access individual fields contained within a frame of DV source.
QuickTime 2001-03-20
Filtering QuickTime media types in Navigation Services (HTML) (日本語 HTML)
QA1274: Describes how to filter QuickTime media types in a Navigation Services filter procedure.
QuickTime 2003-07-23
Filtering the Effects List returned by QTGetEffectsList (HTML) (日本語 HTML)
QA1190: Shows how to edit the list of effects returned by the QTGetEffectsList function.
QuickTime 2002-09-04
Final Cut Pro - Preferred Video Media Time Scales and Sample Durations (HTML)
QA1447: Lists the preferred time scales/sample durations for media created for use with FCP.
QuickTime 2005-10-24
Functions that Modify Movie Properties, QuickTime Track, and Movie Sound Volume (HTML)
QTMTB39: Explains movie volume values, and how to exceed the maximum level using Sound Manager 3.0.
QuickTime 1995-05-01
GDGetScale (HTML)
Deprecated - QTICM04: Describes the function call GDGetScale, its parameters, and errors it may encounter.
QuickTime 1995-05-01
GDHasScale (HTML)
Deprecated - QTICM03: Describes the function GDHasScale; lists what it returns, its main purpose, parameters, and possible errors.
QuickTime 1995-05-01
GDSetScale (HTML)
Deprecated - QTICM05: Describes the function GDSetScale, its parameters, and the errors it may encounter.
QuickTime 1995-05-01
GetDIBFromPict fails with QuickTime "Minimum" installation (HTML)
QA1294: Demonstrates how to check for any available QuickTime components required by individual QuickTime functions.
QuickTime 2004-09-28
Getting a Packet Trace (HTML) (日本語 HTML)
QA1176: Lists tools available for looking at the network packets on the wire.
QuickTime 2008-06-03
Graphics Exporters - Creating 16-bit-per-channel image files (HTML)
QA1354: Discusses how to use QuickTime Graphics Exporters to create 16-bit-per-channel image files.
QuickTime 2004-06-03
Graphics Importer -8970 errors & TIFF Support (HTML)
QTMCC18: Discusses the -8970 error when using graphics importers with certain TIFF files.
QuickTime 2000-11-29
Graphics Importers and image files containing multiple layers (HTML) (日本語 HTML)
QA1148: Describes how to get the natural bounds of layers contained in a multi-layered image file.
QuickTime 2002-06-18
GraphicsImportSetBoundsRect resets your Matrix (HTML) (日本語 HTML)
QA1144: Discusses how calling GraphicsImportSetBoundsRect will reset a graphics importers matrix.
QuickTime 2002-05-29
Handling of Update Events While a Movie Plays (HTML)
Deprecated - QTMTB45: Describes timing issues that can be caused by applications calling WaitNextEvent while playing a QuickTime movie.
QuickTime 1995-09-15
How can I find out what non-RGB pixel formats a codec supports? (HTML) (日本語 HTML)
QA1249: Applications can find out if a codec supports non-RGB pixel formats.
QuickTime 2008-04-24
How can I verify that a Movie can actually draw into a non-RGB GWorld? (HTML) (日本語 HTML)
QA1243: Techniques to verify that a Movie can actually draw into a non-RGB GWorld.
QuickTime 2003-03-05
How can I work with MPEG-2 media using QuickTime? (HTML)
QA1540: How to work with MPEG-2 media using QuickTime.
QuickTime 2007-08-29
How do I count the frames in an MPEG movie? (HTML) (日本語 HTML)
QTMTB54: Talks about using the QuickTime Movie Toolbox function GetMovieNextInterestingTime with MPEG media tracks.
QuickTime 2003-05-02
How do I create a QuickTime movie from PCM audio samples in memory? (HTML)
QA1539: How to create a QuickTime movie from PCM audio samples in memory
QuickTime 2007-08-29
How do I decompress individual frames into an offscreen? (HTML)
QTMTB57: Describes methods for decompressing individual frames of a video track into an offscreen memory buffer.
QuickTime 2000-04-24
How to Compute Data Rate for QuickTime Movies (HTML)
QTMTB46: Describes two methods of measuring the rate of samples for Quicktime movies.
QuickTime 1995-09-15
How to get a native QuickTime movie object from the QuickTime ActiveX/COM control (HTML)
QA1594: Describes how to get a native QuickTime movie object from the QuickTime ActiveX/COM control
QuickTime 2008-03-27
How to Get the First Video Frame (HTML)
QTMCC01: Describes how to get the first frame of a movie using GetMovieNextInterestingTime.
QuickTime 1995-05-01
How to play a sequence of movies in a Web page (HTML)
QA1593: How to have the QuickTime plug-in play a sequence of movies, one after the other, in a Web page
QuickTime 2008-08-08