mp4

README

Fragmented MP4

ffmpeg -i "rtsp://..." -movflags +frag_keyframe+separate_moof+default_base_moof+empty_moov -frag_duration 1 -c copy -t 5 sample.mp4

• movflags frag_keyframe Start a new fragment at each video keyframe.
• frag_duration duration Create fragments that are duration microseconds long.
• movflags separate_moof Write a separate moof (movie fragment) atom for each track.
• movflags default_base_moof Similarly to the omit_tfhd_offset, this flag avoids writing the absolute base_data_offset field in tfhd atoms, but does so by using the new default-base-is-moof flag instead.

https://ffmpeg.org/ffmpeg-formats.html#Options-13

HEVC

Browser	avc1	hvc1	hev1
Mac Chrome	+	-	+
Mac Safari	+	+	-
iOS 15?	+	+	-
Mac Firefox	+	-	-
iOS 12	+	-	-
Android 13	+	-	-

Useful links

• https://stackoverflow.com/questions/63468587/what-hevc-codec-tag-to-use-with-fmp4-hvc1-or-hev1
• https://stackoverflow.com/questions/32152090/encode-h265-to-hvc1-codec
• https://jellyfin.org/docs/general/clients/codec-support.html
• https://github.com/StaZhu/enable-chromium-hevc-hardware-decoding
• https://developer.mozilla.org/ru/docs/Web/Media/Formats/codecs_parameter
• https://gstreamer-devel.narkive.com/rhkUolp2/rtp-dts-pts-result-in-varying-mp4-frame-durations

Documentation

Index

• Constants
• func ContentType(codecs []*core.Codec) string
• func MimeCodecs(codecs []*core.Codec) string
• func ParseCodecs(codecs string, parseAudio bool) (medias []*core.Media)
• func ParseQuery(query map[string][]string) []*core.Media
• func PatchVideoRotate(init []byte, degrees int) bool
• func PatchVideoScale(init []byte, scaleX, scaleY int) bool
• type Consumer
  • func NewConsumer(medias []*core.Media) *Consumer
  • func (c *Consumer) AddTrack(media *core.Media, _ *core.Codec, track *core.Receiver) error
  • func (c *Consumer) WriteTo(wr io.Writer) (int64, error)
• type Keyframe
  • func NewKeyframe(medias []*core.Media) *Keyframe
  • func (c *Keyframe) AddTrack(media *core.Media, _ *core.Codec, track *core.Receiver) error
  • func (c *Keyframe) WriteTo(wr io.Writer) (int64, error)
• type Muxer
  • func (m *Muxer) AddTrack(codec *core.Codec)
  • func (m *Muxer) GetInit() ([]byte, error)
  • func (m *Muxer) GetPayload(trackID byte, packet *rtp.Packet) []byte
  • func (m *Muxer) Reset()

Constants

const (
	MimeH264 = "avc1.640029"
	MimeH265 = "hvc1.1.6.L153.B0"
	MimeAAC  = "mp4a.40.2"
	MimeFlac = "flac"
	MimeOpus = "opus"
)

Functions

func ContentType

func ContentType(codecs []*core.Codec) string

func MimeCodecs

func MimeCodecs(codecs []*core.Codec) string

func ParseCodecs

func ParseCodecs(codecs string, parseAudio bool) (medias []*core.Media)

func ParseQuery

func ParseQuery(query map[string][]string) []*core.Media

ParseQuery - like usual parse, but with mp4 param handler

func PatchVideoRotate

func PatchVideoRotate(init []byte, degrees int) bool

PatchVideoRotate - update video track transformation matrix. Rotation supported by many players and browsers (except Safari). Scale has low support and better not to use it. Supported only 0, 90, 180, 270 degrees.

func PatchVideoScale

func PatchVideoScale(init []byte, scaleX, scaleY int) bool

PatchVideoScale - update "Pixel Aspect Ratio" atom. Supported by many players and browsers (except Firefox). Supported only positive integers.

Types

type Consumer

type Consumer struct {
	core.Connection

	Rotate int `json:"-"`
	ScaleX int `json:"-"`
	ScaleY int `json:"-"`
	// contains filtered or unexported fields
}

func NewConsumer

func NewConsumer(medias []*core.Media) *Consumer

func (*Consumer) AddTrack

func (c *Consumer) AddTrack(media *core.Media, _ *core.Codec, track *core.Receiver) error

func (*Consumer) WriteTo

func (c *Consumer) WriteTo(wr io.Writer) (int64, error)

type Keyframe

type Keyframe struct {
	core.Connection
	// contains filtered or unexported fields
}

func NewKeyframe

func NewKeyframe(medias []*core.Media) *Keyframe

Deprecated: should be rewritten

func (*Keyframe) AddTrack

func (c *Keyframe) AddTrack(media *core.Media, _ *core.Codec, track *core.Receiver) error

func (*Keyframe) WriteTo

func (c *Keyframe) WriteTo(wr io.Writer) (int64, error)

type Muxer

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

func (*Muxer) AddTrack

func (m *Muxer) AddTrack(codec *core.Codec)

func (*Muxer) GetInit

func (m *Muxer) GetInit() ([]byte, error)

func (*Muxer) GetPayload

func (m *Muxer) GetPayload(trackID byte, packet *rtp.Packet) []byte

func (*Muxer) Reset

func (m *Muxer) Reset()