encodebin
encodebin — Convenience encoding/muxing element
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Object Hierarchy
GObject
+----GstObject
+----GstElement
+----GstBin
+----GstEncodeBin
Implemented Interfaces
GstEncodeBin implements
GstChildProxy.
Description
EncodeBin provides a bin for encoding/muxing various streams according to
a specified GstEncodingProfile.
Based on the profile that was set (via the "profile" property),
EncodeBin will internally select and configure the required elements
(encoders, muxers, but also audio and video converters) so that you can
provide it raw or pre-encoded streams of data in input and have your
encoded/muxed/converted stream in output.
Features
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Automatic encoder and muxer selection based on elements available on the
system.
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Conversion of raw audio/video streams (scaling, framerate conversion,
colorspace conversion, samplerate conversion) to conform to the profile
output format.
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Variable number of streams. If the presence property for a stream encoding
profile is 0, you can request any number of sink pads for it via the
standard request pad gstreamer API or the "request-pad" action
signal.
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Avoid reencoding (passthrough). If the input stream is already encoded and is
compatible with what the GstEncodingProfile expects, then the stream won't
be re-encoded but just passed through downstream to the muxer or the output.
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Mix pre-encoded and raw streams as input. In addition to the passthrough
feature above, you can feed both raw audio/video *AND* already-encoded data
to a pad. GstEncodeBin will take care of passing through the compatible
segments and re-encoding the segments of media that need encoding.
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Standard behaviour is to use a GstEncodingContainerProfile to have both
encoding and muxing performed. But you can also provide a single stream
profile (like GstEncodingAudioProfile) to only have the encoding done and
handle the encoded output yourself.
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Audio imperfection corrections. Incoming audio streams can have non perfect
timestamps (jitter), like the streams coming from ASF files. GstEncodeBin
will automatically fix those imperfections for you. See
"audio-jitter-tolerance" for more details.
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Variable or Constant video framerate. If your GstEncodingVideoProfile has
the variableframerate property deactivated (default), then the incoming
raw video stream will be retimestampped in order to produce a constant
framerate.
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Cross-boundary re-encoding. When feeding compatible pre-encoded streams that
fall on segment boundaries, and for supported formats (right now only H263),
the GOP will be decoded/reencoded when needed to produce an encoded output
that fits exactly within the request GstSegment.
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Missing plugin support. If a GstElement is missing to encode/mux to the
request profile formats, a missing-plugin GstMessage will be posted on the
GstBus, allowing systems that support the missing-plugin system to offer the
user a way to install the missing element.
Synopsis
Element Information
plugin |
encoding
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author |
Edward Hervey <edward.hervey@collabora.co.uk> |
class |
Generic/Bin/Encoder |
Element Pads
name |
audio_%d |
direction |
sink |
presence |
request |
details |
ANY |
name |
private_%d |
direction |
sink |
presence |
request |
details |
ANY |
name |
video_%d |
direction |
sink |
presence |
request |
details |
ANY |
name |
src |
direction |
source |
presence |
always |
details |
ANY |
Details
GstEncodeBin
typedef struct _GstEncodeBin GstEncodeBin;
Property Details
The "audio-jitter-tolerance" property
"audio-jitter-tolerance" guint64 : Read / Write
Amount of timestamp jitter/imperfection to allow on audio streams before inserting/dropping samples (ns).
Default value: 20000000
The "avoid-reencoding" property
"avoid-reencoding" gboolean : Read / Write
Whether to re-encode portions of compatible video streams that lay on segment boundaries.
Default value: FALSE
The "queue-buffers-max" property
"queue-buffers-max" guint : Read / Write
Max. number of buffers in the queue (0=disable).
Default value: 200
The "queue-bytes-max" property
"queue-bytes-max" guint : Read / Write
Max. amount of data in the queue (bytes, 0=disable).
Default value: 10485760
The "queue-time-max" property
"queue-time-max" guint64 : Read / Write
Max. amount of data in the queue (in ns, 0=disable).
Default value: 1000000000
Signal Details
The "request-pad" signal
GstPad* user_function (GstEncodeBin *encodebin,
GstCaps *caps,
gpointer user_data) : Run Last / Action
Use this method to request an unused sink request GstPad that can take the
provided caps as input. You must release the pad with
gst_element_release_request_pad() when you are done with it.
encodebin :
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a GstEncodeBin instance
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caps :
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a GstCaps
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user_data :
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user data set when the signal handler was connected. |
Returns : |
A compatible GstPad, or NULL if no compatible GstPad could be
created or is available.
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