Let me just start this blog post by saying that writing to video with OpenCV can be a huge pain in the ass.
If FFMPEG is enabled, using codec=0 fps=0 you can create an uncompressed (raw) video file.Click here to download the source code to this post. FFMPEG FFV1, Huffman HFYU, Lagarith LAGS, etc.) If you want lossless video file you need to use a lossless codecs (eg. To save image sequence use a proper filename (eg. With some backends fourcc=-1 pops up the codec selection dialog from the system. If it is not zero, the encoder will expect and encode color frames, otherwise it will work with grayscale frames (the flag is currently supported on Windows only). FFMPEG backend with MP4 container natively uses other values as fourcc code: see ObjectType, so you may receive a warning message from OpenCV about fourcc code conversion. List of codes can be obtained at MSDN page or with this archived page of the fourcc site for a more complete list). For example, VideoWriter::fourcc('P','I','M','1') is a MPEG-1 codec, VideoWriter::fourcc('M','J','P','G') is a motion-jpeg codec etc. Parameters filenameĤ-character code of codec used to compress the frames. It differs from the above function only in what argument(s) it accepts. This is an overloaded member function, provided for convenience. 
Open (const String &filename, int apiPreference, int fourcc, double fps, Size frameSize, bool isColor=true)Ĭreate (const String &filename, int fourcc, double fps, Size frameSize, bool isColor=true)
Initializes or reinitializes video writer. Open (const String &filename, int fourcc, double fps, Size frameSize, bool isColor=true) Returns true if video writer has been successfully initialized. Returns the specified VideoWriter property. VideoWriter (const String &filename, int apiPreference, int fourcc, double fps, Size frameSize, bool isColor=true) VideoWriter (const String &filename, int fourcc, double fps, Size frameSize, bool isColor=true)
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