Gstreamer 是開放原始碼多媒體開發框架. 先參考 GStreamer 基礎文件, 瞭解模組 (Plugins), 元件 (Element) 與接點 (Pads - source 與 sink).

本文簡單說明 Gstreamer 在 Jetson TK1 R21.2 Ubuntu 14.04 環境下安裝與 gst-* 工具使用.

<< 安裝 GStreamer >>

安裝 GStreamer 1.0 與 0.10 plugins, 函式庫, 工具.
~$ sudo apt-get install gstreamer1.0
~$ sudo apt-get install gstreamer0.10
~$ sudo apt-get install gstreamer-tools

<< 播放音訊檔 >>

使用 gst-play 工具.

~$ gst-play-1.0 http://www.kozco.com/tech/piano2-CoolEdit.mp3

<< 播放影像檔 >> 

使用 gst-launch 工具與 playbin2 元件並 "delay" 輸出 5 秒.

~$ gst-launch playbin2 uri=https://www.collabora.com/assets/images/core/gstreamer-logo.jpg delay=5000000000

使用 gst-launch 工具與 souphttpsrc, jpegdec, ffmpegcolorspace, ffmpegcolorspace, autovideosink 元件播放 JPEG 影像檔.

~$ gst-launch souphttpsrc location=https://www.collabora.com/assets/images/core/gstreamer-logo.jpg ! jpegdec ! ffmpegcolorspace ! imagefreeze ! autovideosink

<< 播放視訊檔 >> 

使用 gst-launch 工具與 playbin2 元件.

~$ gst-launch playbin2 uri=http://cdn.clipcanvas.com/sample/clipcanvas_14348_H264_640x360.mp4

<< 取得視訊檔資訊 >>

使用 gst-discoverer 工具.

~$ gst-discoverer-1.0 http://techslides.com/demos/sample-videos/small.mp4
Analyzing http://techslides.com/demos/sample-videos/small.mp4
Inside NvxLiteH264DecoderLowLatencyInitNvxLiteH264DecoderLowLatencyInit set DPB and MjstreamingNvMMLiteOpen : Block : BlockType = 261
TVMR: NvMMLiteTVMRDecBlockOpen: 4935: NvMMLiteBlockOpen
NvMMLiteBlockCreate : Block : BlockType = 261
TVMR: cbBeginSequence: 571: BeginSequence 560x320, bVPR = 0
TVMR: cbBeginSequence: 813: DecodeBuffers = 3
TVMR: cbBeginSequence: 833: Display Resolution : (560x320)
TVMR: cbBeginSequence: 834: Display Aspect Ratio : (560x320)
TVMR: cbBeginSequence: 996: SurfaceLayout = 3
TVMR: cbBeginSequence: 1026: NumOfSurfaces = 7, InteraceStream = 0, InterlaceEnabled = 0, bSecure = 0, MVC = 0 Semiplanar = 1, bReinit = 1
Allocating new output: 560x320 (x 9), ThumbnailMode = 0
TVMR: cbDisplayPicture: 2290: Retunred NULL Frame Buffer
TVMR: TVMRFrameDelivery: 3673: Closing TVMR Frame Delivery Thread -------------
TVMR: NvMMDecTVMRDestroyParser: 4151: NvAvpClose
TVMR: NvMMLiteTVMRDecBlockClose: 5090: Done
Done discovering http://techslides.com/demos/sample-videos/small.mp4

Topology:
container: Quicktime
audio: MPEG-4 AAC
video: H.264

Properties:
Duration: 0:00:05.568000000
Seekable: yes
Tags:
datetime: 2010-03-20T21:29:11Z
encoder: HandBrake 0.9.4 2009112300
container format: ISO MP4/M4A
audio codec: MPEG-4 AAC audio
maximum bitrate: 91632
bitrate: 83051
language code: en
video codec: H.264 / AVC
minimum bitrate: 166560

<< 查詢所有已安裝模組與元件 >>

gst-inspect 指令列出所有元件, 利用 grep 找出 MP4 相關元件.

~$ gst-inspect-1.0 | grep MP4
libav: avdec_mp3on4: libav MP3onMP4 decoder
libav: avdec_mp3on4float: libav MP3onMP4 decoder
libav: avmux_ipod: libav iPod H.264 MP4 (MPEG-4 Part 14) muxer
libav: avmux_mp4: libav MP4 (MPEG-4 Part 14) muxer (not recommended, use mp4mux instead)
libav: avmux_psp: libav PSP MP4 (MPEG-4 Part 14) muxer
isomp4: mp4mux: MP4 Muxer

<< 顯示指定模組資訊與內含元件 >>

~$ gst-inspect-1.0 isomp4
Plugin Details:
Name isomp4
Description ISO base media file format support (mp4, 3gpp, qt, mj2)
Filename /usr/lib/arm-linux-gnueabihf/gstreamer-1.0/libgstisomp4.so
Version 1.2.4
License LGPL
Source module gst-plugins-good
Source release date 2014-04-18
Binary package GStreamer Good Plugins (Ubuntu)
Origin URL https://launchpad.net/distros/ubuntu/+source/gst-plugins-good1.0

qtdemux: QuickTime demuxer
rtpxqtdepay: RTP packet depayloader
qtmux: QuickTime Muxer
mp4mux: MP4 Muxer
ismlmux: ISML Muxer
3gppmux: 3GPP Muxer
mj2mux: MJ2 Muxer
qtmoovrecover: QT Moov Recover

8 features:
+-- 8 elements

 

* Gstreamer 官網 : http://gstreamer.freedesktop.org/
* Good 元件列表 : http://gstreamer.freedesktop.org/data/doc/gstreamer/1.0/gst-plugins-good-plugins/html
* Bad 元件列表 : http://gstreamer.freedesktop.org/data/doc/gstreamer/1.0/gst-plugins-bad-plugins/html/
* Ugly 元件列表 : http://gstreamer.freedesktop.org/data/doc/gstreamer/1.0/gst-plugins-ugly-plugins/html/

 

 

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