多媒体开发框架，GStreamer 1.6.0 发布

jopen 9年前

GStreamer 是 GNOME 桌面环境下用来构建流媒体应用的多媒体框架（framework），其目标是要简化音/视频应用程序的开发，目前已经能够被用来处理像 MP3、Ogg、MPEG1、MPEG2、AVI、Quicktime 等多种格式的多媒体数据。

GStreamer 团队很高兴的发布了 1.6.0 版本，该版本主要值得关注的改进包括：

  • Stereoscopic 3D and multiview video support

  • Trick mode API for key-frame only fast-forward/fast-reverse playback etc.

  • Improved DTS (decoding timestamp) vs. PTS (presentation timestamp) handling to account for negative DTS

  • New GstVideoConverter API for more optimised and more correct conversion of raw video frames between all supported formats, with rescaling

  • v4l2src now supports renegotiation

  • v4l2transform can now do scaling

  • V4L2 Element now report Colorimetry properly

  • Easier chunked recording of MP4, Matroska, Ogg, MPEG-TS: new splitmuxsink and multifilesink improvements

  • Content Protection signalling API and Common Encryption (CENC) support for DASH/MP4

  • Many adaptive streaming (DASH, HLS and MSS) improvements

  • New PTP and NTP network client clocks and better remote clock tracking stability

  • High-quality text subtitle overlay at display resolutions with glimagesink or gtkglsink

  • RECORD support for the GStreamer RTSP Server

  • Retransmissions (RTX) support in RTSP server and client

  • RTSP seeking support in client and server has been fixed

  • RTCP scheduling improvements and reduced size RTCP support

  • MP4/MOV muxer acquired a new "robust" mode of operation which attempts to keep the output file in a valid state at all times

  • Live mixing support in aggregator, audiomixer and compositor was improved a lot

  • compositor now also supports rescaling of inputs streams on the fly

  • New audiointerleave element with proper input synchronisation and live input support

  • Blackmagic Design DeckLink capture and playback card support was rewritten from scratch; 2k/4k support; mode sensing

  • KLV metadata support in RTP and MPEG-TS

  • H.265 video encoder (x265), decoders (libav, libde265) and RTP payloader and depayloaders

  • New DTLS plugin and SRTP/DTLS support

  • OpenGL3 support, multiple contexts and context propagation, 3D video, transfer/conversion separation, subtitle blending

  • New OpenGL-based QML video sink, Gtk GL video sink, CoreAnimation CAOpenGLLayerSink video sink

  • gst-libav switched to ffmpeg as libav-provider, gains support for 3D/multiview video, trick modes, and the CAVS codec

  • GstHarness API for unit tests

  • gst-editing-services got a completely new ges-launch-1.0 interface, improved mixing support and integration into gst-validate

  • gnonlin has been deprecated in favor of nle (Non Linear Engine) in gst-editing-services

  • gst-validate has a new plugin system, an extensive default testsuite, support for concurrent test runs and valgrind support

  • cerbero build tool for SDK binary packages gains new 'bundle-source' command

  • Various improvements to the Android, iOS, OS X and Windows platform support

修复的 bug 有：

  • Crashes in the gst-libav encoders were fixed

  • More DASH-IF test streams are working now

  • Live DASH, HLS and MS SmoothStreaming streams work more reliable and other fixes for the adaptive streaming protocols

  • Reverse playback works with scaletempo to keep the audio pitch

  • Correct stream-time is reported for negative applied_rate

  • SRTP packet validation during decoding does not reject valid packets anymore

  • Fixes for audioaggregator and aggregator to start producing output at the right time, and e.g. not outputting lots of silence in the beginning

  • gst-libav's internal ffmpeg snapshot was updated to 2.8.1

  • cerbero has support for Mac OS X 10.11 (El Capitan)

  • Various memory leaks were fixed, including major leaks in playbin, playsink and decodebin

  • Various GObject-Introspection annotation fixes for bindings

  • and many, many more