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cv > OpenCV/モジュール/videoio

cv::VideoWriter

Top / cv::VideoWriter

https://docs.opencv.org/3.2.0/dd/d9e/classcv_1_1VideoWriter.html

コンストラクタ

• VideoWriter (const String &filename, int fourcc, double fps, Size frameSize, bool isColor=true)

使い方

• VideoWriter writer;
  int codec = VideoWriter::fourcc('M', 'J', 'P', 'G');
  writer.open(filename, codec, fps, src.size(), isColor);
  writer.write(src);

チュートリアル

• OpenCV/doc/tutorials/videoio/video-write/video_write.markdown

サンプル

• OpenCV/samples/cpp/tutorial_code/videoio/video-write/video-write.cpp?
• OpenCV/samples/cpp/videocapture_basic.cpp

メソッド

• VideoWriter::open
• VideoWriter::fourcc

実装

• OpenCV 3/modules/videoio/src/cap.cpp

OpenCV 4.0

• videoio: drop obsolete backends
• https://github.com/opencv/opencv/commit/5869415a57524cf2dfb5eaba5aafa86ceb395d15#diff-6b6143878d92aa4ec02f65c59109edf2

  バックエンド	ビルドオプション		cv::VideoCaptureAPIs
  Video for Windows	WITH_VFW	HAVE_VFW?	CAP_VFW?
  QuickTime/QtKit?	WITH_QUICKTIME?/WITH_QTKIT?	HAVE_QTKIT?
  Unicap?	WITH_UNICAP?	HAVE_UNICAP?
  DC1394? (1st version) / CMU1394?	WITH_1394?	HAVE_DC1394?

OpenCV 3.4.2

• videoio: backends priority list
  • https://github.com/opencv/opencv/commit/cd9e43704e0082c0fdd4bdef2d2631daa531fe2e#diff-025219446785708058c4098c73ac3067
• cv::videoio_registry

  VideoWriter::open

  cv::VideoBackendRegistry::getAvailableBackends_Writer?

OpenCV 3.3～

• bool VideoWriter::open(const String& filename, int apiPreference, int _fourcc, double fps, Size frameSize, bool isColor)
• IVideoWriter_create

  バックエンド	クラス
  MFX	VideoWriter_IntelMFX?	VideoWriter_IntelMFX::create?
  	mjpeg::MotionJpegWriter?	createMotionJpegWriter?

• cvCreateVideoWriterWithPreference

  ビルドオプション	条件 / cv::VideoCaptureAPIs
  	!fourcc ｜｜ !fps	cvCreateVideoWriter_Images?
  HAVE_FFMPEG?	CAP_FFMPEG?	cvCreateVideoWriter_FFMPEG_proxy
  HAVE_VFW?	CAP_VFW?	cvCreateVideoWriter_VFW
  HAVE_MSMF?	CAP_MSMF?	cvCreateVideoWriter_MSMF?
  HAVE_AVFOUNDATION?	CAP_AVFOUNDATION?	cvCreateVideoWriter_AVFoundation?
  HAVE_QUICKTIME?｜｜HAVE_QTKIT?	CAP_QT?	cvCreateVideoWriter_QT?
  HAVE_GSTREAMER?	CAP_GSTREAMER?	cvCreateVideoWriter_GStreamer?
  	CAP_IMAGES?	cvCreateVideoWriter_Images?

～OpenCV 3.2

• bool VideoWriter::open(const String& filename, int _fourcc, double fps, Size frameSize, bool isColor)

• IVideoWriter_create
  • createMotionJpegWriter?

  バックエンド	クラス
  	mjpeg::MotionJpegWriter?	createMotionJpegWriter?

• cvCreateVideoWriter
  • CvVideoWriter

  バックエンド	クラス
  FFmpeg	CvVideoWriter_FFMPEG	cvCreateVideoWriter_FFMPEG
  Video for Windows	CvVideoWriter_VFW	cvCreateVideoWriter_VFW
  MSMF	CvVideoWriter_MSMF?	cvCreateVideoWriter_MSMF?
  	CvVideoWriter_AVFoundation?	cvCreateVideoWriter_AVFoundation?
  	CvVideoWriter_QT?	cvCreateVideoWriter_QT?
  	CvVideoWriter_GStreamer?	cvCreateVideoWriter_GStreamer?
  	CvVideoWriter_Images?	cvCreateVideoWriter_Images?

FFmpeg (opencv_ffmpeg.dll)

• OpenCV/modules/videoio/src/cap_ffmpeg_impl.hpp

C言語

• cvCreateVideoWriter

メモ

FOURCC

• X264
  • aviだとVFW
  • mp4だとMSMF
• H264
  • aviだと失敗
  • mp4だとMSMF

クラス

• cv::VideoWriter
• cv::cudacodec::VideoWriter?

cv::VideoWriterProperties

関連

• CV_FOURCC
• cv::VideoCapture