View Source Evision.CUDACodec (Evision v0.2.9)
Summary
Functions
Variant 1:
createVideoReader
Variant 1:
createVideoReader
Creates video writer.
Creates video writer.
Creates video writer.
Creates video writer.
Utility function demonstrating how to map the luma histogram when FormatInfo::videoFullRangeFlag == false
Utility function demonstrating how to map the luma histogram when FormatInfo::videoFullRangeFlag == false
Types
@type t() :: %Evision.CUDACodec{ref: reference()}
Type that represents an CUDACodec
struct.
ref.
reference()
The underlying erlang resource variable.
Functions
@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]) -> retval
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]]) -> retval
@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]) -> retval
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]]) -> retval
@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]]]]]) -> retval
@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]]]]]) -> retval
createVideoWriter(fileName, frameSize, codec, fps, colorFormat, params)
View Source@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]]) -> retval
createVideoWriter(fileName, frameSize, codec, fps, colorFormat, params, opts)
View Source@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]]) -> retval
@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]) -> histFull
@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]) -> histFull