GStreamer is a framework for processing multimedia data through a pipes and filters model. It has been in development for 10 years and uses a graph-based system with elements like sources, decoders, and sinks linked together to handle different media formats. Plugins can be added to support various media types, containers, and operations. The framework provides APIs to create graphs of elements programmatically and control playback.

2. Thiago Santos

4. Framework

5. GStreamer
● Framework
– Processamento de dados
– “Pipes and filters”
● LGPL
● 10 anos
– Stable → 0.10
– 0.11/1.0

6. GStreamer
● Plugins
● Baseado em grafos

7. Grafos

8. Grafos

9. Grafos

10. Grafos
File Source

11. Grafos
File Source Matroska Demux

12. Grafos
File Source Matroska Demux
MP3 Dec
H264 Dec

13. Grafos
File Source Matroska Demux
MP3 Dec
H264 Dec
Audio Sink
Video Sink

14. Grafos
Camera Source H264 Encoder MP4 Muxer
File Sink

15. Plugins

16. Plugins
● Pacote de GstElements
– Rede
– Codec
– Utils
– Camera
– Arquivos
– Filtros
– Containers

17. Plugins
● -base
● -good
● -ugly
● -bad
● -ffmpeg

18. Plugins

19. Outro Grafo

20. Framework
● GStreamer core API
– Criar nós
– Ligá-los
– Play!
● Plugins, plugins, plugins
● Bindings

21. GstElement

22. GstPad
● Links elements
● Negotiate formats
– GstCaps

23. GstPipeline
● GstElement
● Container (GstBin)

24. GstBus
● Comunicação
● Mensagens

25. Overview
Aplicação
Pipeline Bus

26. Código
player = gst.Pipeline("player")
source = gst.element_factory_make("filesrc")
decoder = gst.element_factory_make("mad")
conv = gst.element_factory_make("audioconvert")
sink = gst.element_factory_make("alsasink")
player.add(source, decoder, conv, sink)
gst.element_link_many(source, decoder,
conv, sink)

27. GstBin
● Container de GstElements
● Camada de abstração

28. Decodebin
Audio
Decodebin
Video

29. Playbin
Playbin

30. Encodebin
Audio
Encodebin
Video
Perfil

31. Camerabin
Filtros
Zoom
Imagem
Video
Resolução Formatos
Snapshot

32. Tools
Ferramentas

33. gst-inspect
● Listar elementos
● Listar propriedades dos elementos

34. gst-launch
● Prototipação rápida
● Cria pipelines
● Console
gst-launch elemento1 propriedade1=valor !
elemento2 ! elemento 3

35. Gst-SDK
● Linux
● Windows
● OS/X

36. Comunidade
● IRC - #gstreamer @ freenode (thiagoss)
● ML – commits / devel / bugs
● Web - gstreamer.net / gstreamer.com
● GStreamer Conference
● Planet - gstreamer.freedesktop.org/planet/

37. Referências
● Grafos: wikipedia
● Flickr:
– http://www.flickr.com/photos/nocallerid_man/3638360458
– http://www.flickr.com/photos/evaekeblad/454220744/
– http://www.flickr.com/photos/freefoto/5982549938/
– http://www.flickr.com/photos/duckypipeliner/4281438859
– http://www.flickr.com/photos/m4tik/4687192723
– http://www.flickr.com/photos/matthewfch/835831228
– http://www.flickr.com/photos/florianric/7263382550

38. Obrigado!
● Perguntas?
● thiagoss -> #gstreamer @ freenode
● thiago.sousa.santos@collabora.com
● thiagossantos@gmail.com