Membrane Element: H264 v0.4.1 Membrane.Element.FFmpeg.H264.Encoder View Source
Membrane element that encodes raw video frames to H264 format.
The element expects each frame to be received in a separate buffer, so the parser
(Membrane.Element.RawVideo.Parser) may be required in a pipeline before
the encoder (e.g. when input is read from Membrane.Element.File.Source).
Additionaly, the encoder has to receive proper caps with picture format and dimensions before any encoding takes place.
Please check t/0 for available options.
Element options
Passed via struct Membrane.Element.FFmpeg.H264.Encoder.t/0
crfDefault value:
23Constant rate factor that affects the quality of output stream. Value of 0 is lossless compression while 51 (for 8-bit samples) or 63 (10-bit) offers the worst quality. The range is exponential, so increasing the CRF value +6 results in roughly half the bitrate / file size, while -6 leads to roughly twice the bitrate.presetDefault value:
:mediumCollection of predefined options providing certain encoding. The slower the preset choosen, the higher compression for the same quality can be achieved.profileDefault value:
:highDefines the features that will have to be supported by decoder to decode video encoded with this element.
Pads
:input
| Availability | :always |
| Bin? | false |
| Caps | Membrane.Caps.Video.Raw, restrictions:<br /> format: one_of([:I420, :I422]),<br /> aligned: true |
| Demand unit | :buffers |
| Direction | :input |
| Mode | :pull |
| Name | :input |
:output
| Availability | :always |
| Bin? | false |
| Caps | Membrane.Caps.Video.H264, restrictions:<br /> stream_format: :byte_stream,<br /> alignment: :au |
| Direction | :output |
| Mode | :pull |
| Name | :output |
Link to this section Summary
Functions
Returns pads descriptions for Membrane.Element.FFmpeg.H264.Encoder
Returns description of options available for this module
Link to this section Types
Specs
presets() :: :placebo | :veryslow | :slower | :slow | :medium | :fast | :faster | :veryfast | :superfast | :ultrafast
Specs
t() :: %Membrane.Element.FFmpeg.H264.Encoder{
crf: any(),
preset: presets(),
profile: Membrane.Caps.Video.H264.profile_t()
}
Struct containing options for Membrane.Element.FFmpeg.H264.Encoder
Link to this section Functions
Specs
membrane_pads() :: [{Membrane.Pad.name_t(), Membrane.Pad.description_t()}]
Returns pads descriptions for Membrane.Element.FFmpeg.H264.Encoder
Specs
options() :: keyword()
Returns description of options available for this module