ffmpeg

Documentation

Index

• Constants
• func SetFFmpegLogLevel(logLevel AVLogLevel)
• func SetLogging(handler LoggingHandlerFunction)
• type AVContext
  • func LoadAVContext(reader io.Reader, size int64) (*AVContext, error)
  • func (av *AVContext) Close()
  • func (av *AVContext) Export(bands int) (buf []byte, err error)
  • func (av *AVContext) Metadata() *Metadata
  • func (av *AVContext) ProcessFrames(maxFrames int) (err error)
  • func (av *AVContext) SeekDuration(ts time.Duration) error
  • func (av *AVContext) SeekPosition(f float64) error
  • func (av *AVContext) SelectDuration(ts time.Duration) (err error)
  • func (av *AVContext) SelectFrame(n int) (err error)
  • func (av *AVContext) SelectPosition(f float64) (err error)
• type AVLogLevel
• type LoggingHandlerFunction
• type Metadata

Constants

const (
	ErrNoMem           = avError(-C.ENOMEM)
	ErrEOF             = avError(C.AVERROR_EOF)
	ErrUnknown         = avError(C.AVERROR_UNKNOWN)
	ErrDecoderNotFound = avError(C.AVERROR_DECODER_NOT_FOUND)
	ErrInvalidData     = avError(C.AVERROR_INVALIDDATA)
	ErrTooBig          = avError(C.ERR_TOO_BIG)
)

AV Error enum

Functions

func SetFFmpegLogLevel

func SetFFmpegLogLevel(logLevel AVLogLevel)

SetFFmpegLogLevel allows you to change the log level from the default (AVLogInfo).

func SetLogging

func SetLogging(handler LoggingHandlerFunction)

SetLogging set AV logging handler

Types

type AVContext

type AVContext struct {
	// contains filtered or unexported fields
}

AVContext manages lifecycle of AV contexts and reader stream

func LoadAVContext

func LoadAVContext(reader io.Reader, size int64) (*AVContext, error)

LoadAVContext load and create AVContext from reader stream

func (*AVContext) Close

func (av *AVContext) Close()

Close AVContext objects

func (*AVContext) Export

func (av *AVContext) Export(bands int) (buf []byte, err error)

Export frame to RGB or RGBA buffer

func (*AVContext) Metadata

func (av *AVContext) Metadata() *Metadata

Metadata AV metadata

func (*AVContext) ProcessFrames

func (av *AVContext) ProcessFrames(maxFrames int) (err error)

ProcessFrames triggers frame processing limit under max num of frames if maxFrames > 0

func (*AVContext) SeekDuration

func (av *AVContext) SeekDuration(ts time.Duration) error

SeekDuration seeks to keyframe before the specified duration

func (*AVContext) SeekPosition

func (av *AVContext) SeekPosition(f float64) error

SeekPosition seeks to keyframe before specified position percentage between 0 and 1 then process frames to find precise position

func (*AVContext) SelectDuration

func (av *AVContext) SelectDuration(ts time.Duration) (err error)

SelectDuration seeks to keyframe before the specified duration then process frames to find precise duration

func (*AVContext) SelectFrame

func (av *AVContext) SelectFrame(n int) (err error)

SelectFrame triggers frame processing and select specific frame index

func (*AVContext) SelectPosition

func (av *AVContext) SelectPosition(f float64) (err error)

type AVLogLevel

type AVLogLevel int

AVLogLevel defines the ffmpeg threshold for dumping information to stderr.

const (
	AVLogQuiet AVLogLevel = (iota - 1) * 8
	AVLogPanic
	AVLogFatal
	AVLogError
	AVLogWarning
	AVLogInfo
	AVLogVerbose
	AVLogDebug
	AVLogTrace
)

AVLogLevel enum

type LoggingHandlerFunction

type LoggingHandlerFunction func(messageLevel AVLogLevel, message string)

type Metadata

type Metadata struct {
	Orientation int     `json:"orientation"`
	Duration    int     `json:"duration,omitempty"`
	Width       int     `json:"width,omitempty"`
	Height      int     `json:"height,omitempty"`
	Title       string  `json:"title,omitempty"`
	Artist      string  `json:"artist,omitempty"`
	FPS         float64 `json:"fps,omitempty"`
	HasVideo    bool    `json:"has_video"`
	HasAudio    bool    `json:"has_audio"`
}

Metadata AV metadata