English - QuickTime Programing

raw2qt264 is a command line encoder using QuickTime H.264 codec for Mac OS X. raw2qt264 reads raw video from ffmpeg via pipe. You can specify pass count and bit rate.

• Binary
• Source code

raw2qt264.source.zip is Xcode project, so you can modify and build easily.

2006.1.21　Universal Binary. New Intel iMas is fater 2.5 times than iMac G5.

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Comment

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How to use

% raw2qt264 Pass Kbps rawCommand outFile.mov
rawCommand is a line command to output yuv4mpegpipe to stdout.

• Convert inFile.mpg to outFile.mov, pass count is 2 and bit rate is 1000Kbps.

% raw2qt264 2 1000 "ffmpeg -i inFile.mpg -vcodec rawvideo -f yuv4mpegpipe -" outFile.mov

• Deinterlace, scale to 640x480 and crop to 90 % using ffmpeg

% raw2qt264 2 1000 "ffmpeg -i inFile.mpg -deinterlace -s 640x480 -croptop 24 -cropbottom 24 -cropleft 32 -cropright 32 -vcodec rawvideo -f yuv4mpegpipe -" outFile.mov

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Memo

• renice by itself.

setpriority(PRIO_USER, 0, 10);

• Compress setting is in createCompressionSession(). You can find setting items in following header.

/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/QuickTime.framework/Versions/A/Headers/ImageCompression.h
の、Properties of compression sessions options objects.

• Key frame rate is currenty 300.

err = ICMCompressionSessionOptionsSetMaxKeyFrameInterval(sessionOptions, 300);

MaxPartialSyncFrameInterval, AllowFrameTimeChanges, DataRateLimits(Hard limit) are set to default.

Based on following Apple's sample code.
http://developer.apple.com/samplecode/CaptureAndCompressIPBMovie/CaptureAndCompressIPBMovie.html

QuickTime Session API documents
http://developer.apple.com/qa/qa2005/qa1450.html
http://developer.apple.com/qa/qa2005/qa1455.html
http://developer.apple.com/qa/qa2005/qa1460.html
http://developer.apple.com/qa/qa2005/qa1456.html

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