gstreamer exp

1.Time

有多种实现，一般是GstSystemClock

Running time at 't':
– t = gst_clock_get_time (clock);
– Running time = t - base

 

Segment

Need a way to define a relative starting position for a stream

GstSegment
– Define playback boundaries
● Start and stop positions
– Running time = timestamp - segment.start

 

Playback rate
● Play media slower or faster
● No changes to the clock speed
● Use the segment.rate

 

Basesink

AudioBaseSink

Extends GstBaseSink and provides basic audio
sink features by managing a ringbuffer

AudioSink
Subclass of GstAudioBaseSink that creates a
GstAudioRingBuffer

 

How can video decoders work, if they need to process GOPs in order?
– Decode in normal order, but push data in reverse

 

https://gstreamer.freedesktop.org/documentation/gstreamer/gstinfo.html

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gst-running.html

https://github.com/luisbg/emacs-gstreamer