@spec createNVSurfaceToColorConverter(Keyword.t()) :: any() | {:error, String.t()}

@spec createNVSurfaceToColorConverter(Evision.CUDACodec.ColorSpaceStandard.t()) ::
  Evision.CUDACodec.NVSurfaceToColorConverter.t() | {:error, String.t()}

Creates a NVSurfaceToColorConverter.

Positional Arguments

• colorSpace: ColorSpaceStandard.

  The requested @ref ColorSpaceStandard for the converter.

Keyword Arguments

• videoFullRangeFlag: bool.

  Indicates if the black level, luma and chroma of the source are represented using the full or limited range (AKA TV or "analogue" range) of values as defined in Annex E of the ITU-T Specification.

Return

• retval: NVSurfaceToColorConverter

Python prototype (for reference only):

createNVSurfaceToColorConverter(colorSpace[, videoFullRangeFlag]) -> retvalcopy

@spec createNVSurfaceToColorConverter(
  Evision.CUDACodec.ColorSpaceStandard.t(),
  [{:videoFullRangeFlag, term()}] | nil
) :: Evision.CUDACodec.NVSurfaceToColorConverter.t() | {:error, String.t()}

Creates a NVSurfaceToColorConverter.

Positional Arguments

• colorSpace: ColorSpaceStandard.

  The requested @ref ColorSpaceStandard for the converter.

Keyword Arguments

• videoFullRangeFlag: bool.

  Indicates if the black level, luma and chroma of the source are represented using the full or limited range (AKA TV or "analogue" range) of values as defined in Annex E of the ITU-T Specification.

Return

• retval: NVSurfaceToColorConverter

Python prototype (for reference only):

createNVSurfaceToColorConverter(colorSpace[, videoFullRangeFlag]) -> retvalcopy

@spec createVideoReader(Keyword.t()) :: any() | {:error, String.t()}

@spec createVideoReader(Evision.CUDACodec.RawVideoSource.t()) ::
  Evision.CUDACodec.VideoReader.t() | {:error, String.t()}

@spec createVideoReader(binary()) ::
  Evision.CUDACodec.VideoReader.t() | {:error, String.t()}

Variant 1:

createVideoReader

Positional Arguments

• source: RawVideoSource.

  RAW video source implemented by user.

Keyword Arguments

• params: VideoReaderInitParams.

  Initializaton parameters. See cv::cudacodec::VideoReaderInitParams.

Return

• retval: VideoReader

Has overloading in C++

Python prototype (for reference only):

createVideoReader(source[, params]) -> retvalcopy

Variant 2:

Creates video reader.

Positional Arguments

• filename: String.

  Name of the input video file.

Keyword Arguments

• sourceParams: [integer()].

  Pass through parameters for VideoCapure. VideoCapture with the FFMpeg back end (CAP_FFMPEG) is used to parse the video input. The sourceParams parameter allows to specify extra parameters encoded as pairs (paramId_1, paramValue_1, paramId_2, paramValue_2, ...). See cv::VideoCaptureProperties e.g. when streaming from an RTSP source CAP_PROP_OPEN_TIMEOUT_MSEC may need to be set.

• params: VideoReaderInitParams.

  Initializaton parameters. See cv::cudacodec::VideoReaderInitParams.

Return

• retval: VideoReader

FFMPEG is used to read videos. User can implement own demultiplexing with cudacodec::RawVideoSource

Python prototype (for reference only):

createVideoReader(filename[, sourceParams[, params]]) -> retvalcopy

@spec createVideoReader(
  Evision.CUDACodec.RawVideoSource.t(),
  [{:params, term()}] | nil
) ::
  Evision.CUDACodec.VideoReader.t() | {:error, String.t()}

@spec createVideoReader(binary(), [params: term(), sourceParams: term()] | nil) ::
  Evision.CUDACodec.VideoReader.t() | {:error, String.t()}

Variant 1:

createVideoReader

Positional Arguments

• source: RawVideoSource.

  RAW video source implemented by user.

Keyword Arguments

• params: VideoReaderInitParams.

  Initializaton parameters. See cv::cudacodec::VideoReaderInitParams.

Return

• retval: VideoReader

Has overloading in C++

Python prototype (for reference only):

createVideoReader(source[, params]) -> retvalcopy

Variant 2:

Creates video reader.

Positional Arguments

• filename: String.

  Name of the input video file.

Keyword Arguments

• sourceParams: [integer()].

  Pass through parameters for VideoCapure. VideoCapture with the FFMpeg back end (CAP_FFMPEG) is used to parse the video input. The sourceParams parameter allows to specify extra parameters encoded as pairs (paramId_1, paramValue_1, paramId_2, paramValue_2, ...). See cv::VideoCaptureProperties e.g. when streaming from an RTSP source CAP_PROP_OPEN_TIMEOUT_MSEC may need to be set.

• params: VideoReaderInitParams.

  Initializaton parameters. See cv::cudacodec::VideoReaderInitParams.

Return

• retval: VideoReader

FFMPEG is used to read videos. User can implement own demultiplexing with cudacodec::RawVideoSource

Python prototype (for reference only):

createVideoReader(filename[, sourceParams[, params]]) -> retvalcopy

@spec createVideoWriter(
  binary(),
  {number(), number()}
) :: Evision.CUDACodec.VideoWriter.t() | {:error, String.t()}

Creates video writer.

Positional Arguments

• fileName: String.

  Name of the output video file.

• frameSize: Size.

  Size of the input video frames.

Keyword Arguments

• codec: Codec.

  Supports Codec::H264 and Codec::HEVC.

• fps: double.

  Framerate of the created video stream.

• colorFormat: ColorFormat.

  OpenCv color format of the frames to be encoded.

• encoderCallback: EncoderCallback.

  Callbacks for video encoder. See cudacodec::EncoderCallback. Required for working with the encoded video stream.

• stream: cuda_Stream.

  Stream for frame pre-processing.

Return

• retval: Evision.CUDACodec.VideoWriter.t()

Python prototype (for reference only):

createVideoWriter(fileName, frameSize[, codec[, fps[, colorFormat[, encoderCallback[, stream]]]]]) -> retvalcopy

@spec createVideoWriter(
  binary(),
  {number(), number()},
  [
    codec: term(),
    colorFormat: term(),
    encoderCallback: term(),
    fps: term(),
    stream: term()
  ]
  | nil
) :: Evision.CUDACodec.VideoWriter.t() | {:error, String.t()}

Creates video writer.

Positional Arguments

• fileName: String.

  Name of the output video file.

• frameSize: Size.

  Size of the input video frames.

Keyword Arguments

• codec: Codec.

  Supports Codec::H264 and Codec::HEVC.

• fps: double.

  Framerate of the created video stream.

• colorFormat: ColorFormat.

  OpenCv color format of the frames to be encoded.

• encoderCallback: EncoderCallback.

  Callbacks for video encoder. See cudacodec::EncoderCallback. Required for working with the encoded video stream.

• stream: cuda_Stream.

  Stream for frame pre-processing.

Return

• retval: Evision.CUDACodec.VideoWriter.t()

Python prototype (for reference only):

createVideoWriter(fileName, frameSize[, codec[, fps[, colorFormat[, encoderCallback[, stream]]]]]) -> retvalcopy

@spec createVideoWriter(
  binary(),
  {number(), number()},
  Evision.CUDACodec.Codec.t(),
  number(),
  Evision.CUDACodec.ColorFormat.t(),
  Evision.CUDACodec.EncoderParams.t()
) :: Evision.CUDACodec.VideoWriter.t() | {:error, String.t()}

Creates video writer.

Positional Arguments

• fileName: String.

  Name of the output video file.

• frameSize: Size.

  Size of the input video frames.

• codec: Codec.

  Supports Codec::H264 and Codec::HEVC.

• fps: double.

  Framerate of the created video stream.

• colorFormat: ColorFormat.

  OpenCv color format of the frames to be encoded.

• params: EncoderParams.

  Additional encoding parameters.

Keyword Arguments

• encoderCallback: EncoderCallback.

  Callbacks for video encoder. See cudacodec::EncoderCallback. Required for working with the encoded video stream.

• stream: cuda_Stream.

  Stream for frame pre-processing.

Return

• retval: Evision.CUDACodec.VideoWriter.t()

Python prototype (for reference only):

createVideoWriter(fileName, frameSize, codec, fps, colorFormat, params[, encoderCallback[, stream]]) -> retvalcopy

@spec createVideoWriter(
  binary(),
  {number(), number()},
  Evision.CUDACodec.Codec.t(),
  number(),
  Evision.CUDACodec.ColorFormat.t(),
  Evision.CUDACodec.EncoderParams.t(),
  [encoderCallback: term(), stream: term()] | nil
) :: Evision.CUDACodec.VideoWriter.t() | {:error, String.t()}

Creates video writer.

Positional Arguments

• fileName: String.

  Name of the output video file.

• frameSize: Size.

  Size of the input video frames.

• codec: Codec.

  Supports Codec::H264 and Codec::HEVC.

• fps: double.

  Framerate of the created video stream.

• colorFormat: ColorFormat.

  OpenCv color format of the frames to be encoded.

• params: EncoderParams.

  Additional encoding parameters.

Keyword Arguments

• encoderCallback: EncoderCallback.

  Callbacks for video encoder. See cudacodec::EncoderCallback. Required for working with the encoded video stream.

• stream: cuda_Stream.

  Stream for frame pre-processing.

Return

• retval: Evision.CUDACodec.VideoWriter.t()

Python prototype (for reference only):

createVideoWriter(fileName, frameSize, codec, fps, colorFormat, params[, encoderCallback[, stream]]) -> retvalcopy

@spec mapHist(Keyword.t()) :: any() | {:error, String.t()}

@spec mapHist(Evision.CUDA.GpuMat.t()) :: Evision.Mat.t() | {:error, String.t()}

Utility function demonstrating how to map the luma histogram when FormatInfo::videoFullRangeFlag == false

Positional Arguments

• hist: Evision.CUDA.GpuMat.t().

  Luma histogram \a hist returned from VideoReader::nextFrame(GpuMat& frame, GpuMat& hist, Stream& stream).

Return

• histFull: Evision.Mat.t().

  Host histogram equivelent to downloading \a hist after calling cuda::calcHist(InputArray frame, OutputArray hist, Stream& stream).

Note:

• This function demonstrates how to map the luma histogram back so that it is equivalent to the result obtained from cuda::calcHist() if the returned frame was ColorFormat::GRAY.

Python prototype (for reference only):

MapHist(hist[, histFull]) -> histFullcopy

@spec mapHist(Evision.CUDA.GpuMat.t(), [{atom(), term()}, ...] | nil) ::
  Evision.Mat.t() | {:error, String.t()}

Utility function demonstrating how to map the luma histogram when FormatInfo::videoFullRangeFlag == false

Positional Arguments

• hist: Evision.CUDA.GpuMat.t().

  Luma histogram \a hist returned from VideoReader::nextFrame(GpuMat& frame, GpuMat& hist, Stream& stream).

Return

• histFull: Evision.Mat.t().

  Host histogram equivelent to downloading \a hist after calling cuda::calcHist(InputArray frame, OutputArray hist, Stream& stream).

Note:

• This function demonstrates how to map the luma histogram back so that it is equivalent to the result obtained from cuda::calcHist() if the returned frame was ColorFormat::GRAY.

Python prototype (for reference only):

MapHist(hist[, histFull]) -> histFullcopy