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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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Calculating the video frame rate of an MPEG-1 or MPEG-2 movie (HTML) ()
QA1262: Computing the video frame rate of an MPEG-1 or MPEG-2 movie.
QuickTime 2003-06-02
Calling InitializeQTML from DLL Main (HTML) ()
QTW89: Don't do anything significant in your QuickTime 3 for Windows DLL Main procedure.
QuickTime 1998-09-21
Checking For Presence of QuickTime 3 for Windows (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
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) ()
QTMTB51: Explains why white frames can occur in a movie that was saved using ConvertMovieToFile.
QuickTime 1999-06-14
Core Audio & Xcode - Ensuring the latest Core Audio Headers are installed (HTML)
QA1386: Describes how to ensure you're working with the latest Core Audio Header files with Xcode.
QuickTime 2005-01-18
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) ()
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) ()
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 2004-05-20
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
Derived Media Handler Components Update (HTML) ()
QTMCC08: Gives practical limits for data transfer rates under QuickTime 2.5.
QuickTime 1996-08-21
Determining Open Firmware configuration variables (HTML) ()
HW56: Discusses how to determine the Open Firmware variables on a system.
QuickTime 1999-03-29
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) ()
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) ()
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) ()
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
Expansion ROM device properties (HTML) ()
HW50: Describes the Open Firmware properties that should be included in a boot device's expansion ROM.
QuickTime 1999-03-29
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) ()
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) ()
QA1190: Shows how to edit the list of effects returned by the QTGetEffectsList function.
QuickTime 2002-09-04
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) ()
QA1176: Lists tools available for looking at the network packets on the wire.
QuickTime 2004-07-13
Getting started with Forth (HTML) ()
HW53: Describes where FCode driver developers can get information about the Forth programming language.
QuickTime 1999-03-29
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) ()
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) ()
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) ()
QA1249: Applications can find out if a codec supports non-RGB pixel formats.
QuickTime 2004-01-05
How can I verify that a Movie can actually draw into a non-RGB GWorld? (HTML) ()
QA1243: Techniques to verify that a Movie can actually draw into a non-RGB GWorld.
QuickTime 2003-03-05
How do I count the frames in an MPEG movie? (HTML) ()
QTMTB54: Talks about using the QuickTime Movie Toolbox function GetMovieNextInterestingTime with MPEG media tracks.
QuickTime 2003-05-02
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 the First Video Frame (HTML)
QTMCC01: Describes how to get the first frame of a movie using GetMovieNextInterestingTime.
QuickTime 1995-05-01
How to Tell Whether a Picture is QuickTime-Compressed (HTML)
QTICM02: Details how to determine whether a picture's QuickTime-compressed, contains QuickTime-compressed images, and type of compression used.
QuickTime 1995-05-01
Image Compression Dialog Options (HTML)
QTICM14: Describes how to display an extra Options button in the normal Image Compression dialog.
QuickTime 1995-08-01
Image Decompressor Data-loading Procs (HTML) ()
QTMCC19: Explains how to use an image decompressor's data-loading proc.
QuickTime 2003-07-10
ImageDescription Extension Format (HTML) ()
QTMCC04: Gives a reference for information on image description extensions.
QuickTime 1996-11-27
Importer Components - What is the 'mcfg' resource used for? (HTML) ()
QA1267: QuickTime 6 added the Media Configuration 'mcfg' resource which lists Importer Component file type characteristics.
QuickTime 2003-05-12
Importing image data from memory (HTML)
QTMTB56: Explains using the graphics importer API's to read image data which resides in memory.
QuickTime 2000-04-03
Importing Sys 7 Snds (HTML)
QTMCC16: Describes how to import System 7 sound files using QuickTime.
QuickTime 2000-09-22
Incorrect Inside Macintosh Volume V documentation (HTML)
Deprecated - QD15: Identifies incorrect documentation in Inside Macintosh Volume V regarding the formats of PnPixPat and BkPixPat opcodes.
QuickTime 1995-09-15
Intercepting movie controller actions (HTML)
QA1094: Demonstrates how to intercept movie controller actions.
QuickTime 2001-11-14
Intercepting QuickTime Wired Actions (HTML)
QA1095: Demonstrates how to intercept wired actions in a movie controller action filter function.
QuickTime 2001-11-14
IOKit Framework Headers (HTML) ()
QA1107: Describes the differences between the headers in IOKit.framework and the I/O Kit headers in Kernel.framework.
QuickTime 2002-01-15
Is ColorSync thread safe? (HTML) ()
QA1261: Discusses ColorSync thread-safety issues.
QuickTime 2003-04-17
Is QuickTime thread-safe? (HTML)
QA1088: Discusses thread-safety and reentrancy of the QuickTime library on both Mac & Windows.
QuickTime 2001-11-01
Is the Open Firmware device tree object oriented? (HTML)
HW80: Discusses the object-oriented attributes of the Open Firmware device tree.
QuickTime 1999-11-15
Keyframes and AddMediaSample (HTML)
QTMCC20: Describes setting flags correctly for AddMediaSample to mark keyframes and difference frames.
QuickTime 2000-12-01
Legacy Devices (HTML)
HW84: Discusses why legacy devices with hard-wired I/O addresses may not work properly with Open Firmware.
QuickTime 2000-03-20
Limiting the component list in SCRequestImageSettings() (HTML)
QA1062: Describes the scCompressionListType flag, which limits the list of compressors shown in the standard image settings dialog.
QuickTime 2001-07-24
Linked Movies with Different Color Palettes (HTML) ()
QTMRF07: Explains why a QuickTime movie shouldn't contain subMovies that have different color palettes.
QuickTime 1996-02-15
LockPixels and DisposeGWorld with QTNewGWorldFromPtr (HTML)
QA1007: Clarifies some issues surrounding pointer ownership when creating GWorlds with QTNewGWorldFromPtr
QuickTime 2001-02-26
MCSetClip and Clipping with the Movie Controller (HTML)
QTMTB18: Tells why the movie controller ignores the clip set by SetMovieDisplayClipRgn and shows a correct clipping technique.
QuickTime 1995-05-01
Movie Drawing Complete Procedure with C++ (HTML) ()
QA1150: Demonstrates a static class method which can be used as a QuickTime movie drawing complete callback.
QuickTime 2002-06-18
Movie Export Components - Supporting a MovieProgressProc (HTML) ()
QA1230: Explains the steps needed to support a movie progress proc in a movie export component.
QuickTime 2003-01-31
Movie export with AAC or AMR audio formats (HTML)
QA1347: This QA discusses use of the QuickTime AMR and AAC audio compressors on Macintosh and Windows
QuickTime 2004-05-20
Movie Import Component Selectors (HTML) ()
QTMCC09: Explains why there is no documentation on the movie import API selectors: kMovieImportGetFileTypeSelect and kMovieImportDataRefSelect.
QuickTime 1996-08-21
Movies - Saving movie playback hints (HTML)
QA1366: Explains how to save and load media play hints from Movie files.
QuickTime 2004-09-14
MPEG Compression in QuickTime (HTML)
QTICM16: Describes extracting information from an MPEG movie file and placing it in a specific MPEG track.
QuickTime 1995-08-01
MSVC++ link error LNK4098 When Building QuickTime 3 for Windows Apps (HTML) ()
QTW94: Avoid MSVC++ link error LNK4098 when building QuickTime 3 for Windows applications.
QuickTime 1998-09-21
The "packages" node in the device tree (HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
QuickTime 2000-09-05
paramErr returned from ConvertMovieToFile when exporting to .wav (HTML)
QA1313: Avoid a paramErr returned from ConvertMovieToFile by setting up a Sound Description when exporting to a .wav file.
QuickTime 2003-10-06
PICT, QuickTime-Compressed Testing (HTML)
QTICM09: Details how to determine whether a picture's QuickTime-compressed, contains QuickTime-compressed images, and type of compression used
QuickTime 1995-05-01
Playing a sound using QTJ (HTML)
Deprecated - QTJ01: Explains how to play sounds in Java using QuickTime for Java.
QuickTime 1999-10-25
Playing memory-resident WAVE data using QuickTime 4 (HTML) ()
QTMTB52: Explains how to play memory-resident WAVE data in QuickTime 4 or later.
QuickTime 1999-07-21
Playing QuickTime 3 Movie Sound Data (HTML) ()
QTMTB50: Explains why a movie's sound data can continue to play longer than video data.
QuickTime 1998-11-09
Preroll Movies (HTML)
QTMTB42: Lists the advantages of calling PreRollMovie to improve the performance of QuickTime movies.
QuickTime 1995-05-01
Preserving embedded ICC profiles when using QuickTime Graphics Importer/Exporters (HTML) ()
QA1145: Shows how to preserve the embedded ICC profile when using the QuickTime Graphics Importer/Exporter routines
QuickTime 2002-09-04
Preview image quality of DV capture (HTML)
QTMCC12: Describes how to get full resolution preview image quality when capturing DV.
QuickTime 2000-10-25
Programmatic configuration of a Movie Export Component (HTML) ()
QA1147: Demonstrates how to programmatically configure a movie export component without showing the Movie Export dialog.
QuickTime 2002-06-18
QTML, c2pstr and Pascal strings (HTML) ()
QA1112: Describes how to avoid headaches when dealing with Pascal to C string conversion with QTML.
QuickTime 2002-01-21
Quality of QuickTime video effects (HTML)
QA1089: Describes some of the factors affecting QuickTime video effects quality.
QuickTime 2001-10-26
QuickTime & Noise Problems (HTML)
QTPC02: Talks about ways to reduce noise in movies created with the CinePak codec.
QuickTime 1995-05-01
QuickTime & PutMovieIntoDataFork, Offsets (HTML)
QTMTB34: Explains restrictions on moving movie data around in a file after creation; also gives work arounds.
QuickTime 1995-05-01
QuickTime .qtx/.qtr/.qt/.mov files defined (HTML)
QTW99: Definitions for the QuickTime for Windows .qtx/.qtr/.qt/.mov files.
QuickTime 2000-09-05
QuickTime 6.4 & AvailabilityMacros.h on Mac OS X 10.2.x (HTML)
QA1316: Fixing compilation issues when upgrading to QuickTime 6.4 on Mac OS X 10.2.x systems.
QuickTime 2003-10-21
QuickTime and Carbon Events (HTML)
QA1090: Discusses how to ensure smooth movie playback when using Carbon Events in an application.
QuickTime 2001-10-26
QuickTime DirectDraw Surfaces (HTML)
QTW96: How to make QuickTime 4 for Windows draw onto a surface using your custom DirectDraw object.
QuickTime 1999-11-01
QuickTime Effects - How to set up parameter description values when using kParameterTypeDataImage (HTML) ()
QA1326: Setting up an effect parameter description when using kParameterTypeDataImage as the parameter data type.
QuickTime 2003-12-09
QuickTime Error -2127 qtNetworkAlreadyAllocatedErr Explained (HTML) ()
QA1244: QuickTime qtNetworkAlreadyAllocatedErr error code (-2127) occurs when the user's Connection Speed preference setting is too slow.
QuickTime 2003-03-20