GstShark - Bitrate tracer

GstShark
Getting Started
Getting the code Dependencies Building tracers Eclipse Plugin
Generating trace files
Tracer Parameters
Available Tracers
InterLatency Processing time Frame rate Schedule time CPU usage Graphic Bitrate Queue Level Buffer
Results
Common Trace Format Pipeline Diagram
Visualization Tools
gstshark-plot Eclipse plugin
Examples
CPU usage analysis Frame rate example Processing time example Scheduling time example Interlatency example
Contact Us

The bitrate tracer displays the number of bits that go out of a source pad in a second. This is a measurement of the bitrate of the stream. It is updated and printed on the output log every second. The data from this tracer is especially useful for the output of encoders, as it will be able to provide the compression rate and the potential variation of the bitrate value over time.

Currently, there are no plots available to be generated based on this tracer. This is a feature that is being developed and will be made available in a future release.

Problems running the pipelines shown on this page? Please see our GStreamer Debugging guide for help.

Pipeline

The following pipeline provides a guide of the usage of the bitrate tracer and the results obtained. In this example, elements with very different bitrates are included.

$ GST_DEBUG="GST_TRACER:7" GST_TRACERS="bitrate" gst-launch-1.0 videotestsrc ! 'video/x-raw, format=(string)YUY2, width=(int)640, height=(int)480, framerate=(fraction)30/1' ! videorate max-rate=30 ! videoconvert ! queue ! avenc_h263p ! queue ! avimux ! fakesink sync=true

Graph

Output

0:00:19.474510925  4823 0x10de400 TRACE GST_TRACER :0:: bitrate, pad=(string)avenc_h263p0_src, bitrate=(guint64)1408000;
0:00:19.474556080  4823 0x10de400 TRACE GST_TRACER :0:: bitrate, pad=(string)queue1_src, bitrate=(guint64)1405776;
0:00:19.474577011  4823 0x10de400 TRACE GST_TRACER :0:: bitrate, pad=(string)capsfilter0_src, bitrate=(guint64)147456000;
0:00:19.474595308  4823 0x10de400 TRACE GST_TRACER :0:: bitrate, pad=(string)videotestsrc0_src, bitrate=(guint64)147456000;
0:00:19.474610751  4823 0x10de400 TRACE GST_TRACER :0:: bitrate, pad=(string)videorate0_src, bitrate=(guint64)147456000;
0:00:19.474624919  4823 0x10de400 TRACE GST_TRACER :0:: bitrate, pad=(string)videoconvert0_src, bitrate=(guint64)110592000;
0:00:19.474638984  4823 0x10de400 TRACE GST_TRACER :0:: bitrate, pad=(string)avimux0_src, bitrate=(guint64)1407792;
0:00:19.474656953  4823 0x10de400 TRACE GST_TRACER :0:: bitrate, pad=(string)queue0_src, bitrate=(guint64)110592000;

Each log line provides a pad field with the source pad being measured and a bitrate field with the number of bits produced in the last second.