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• ffmpeg - Stream media file with alpha channel

  14 décembre 2018, par cub33

  What I would like to achieve is to stream a PNG image (containing alpha background) to localhost in order to use it as input to watermark the main video stream. For example I have a ffmpeg process that would stream the png :

  ffmpeg -loop 1 -i image_with_alpha_backgroung.png -options options protocol://localhost:3000

  Main ffmpeg process :

  ffmpeg -i main_video -i protocol://localhost:3000 -filter_complex overlay -f flv rtmp://streaming_server

  The main ffmpeg process would listen for that png watermark stream and would insert it only when streamed from the png ffmpeg stream process. How is it achievable ? What I have tried is to stream the png with image2pipe format but it transforms the images in mjpeg and also tried to stream .webm files since the vp9 codec supports alpha but when receiving the webm stream the main process doesn’t like the input format. Thank you for your attention

• Revert "lavf/dashenc : Write media trailers when DASH trailer is written."

  3 décembre 2018, par Karthick J

  Revert "lavf/dashenc : Write media trailers when DASH trailer is written."
  This reverts commit e444b3b184f36e3c97bb3489822f6b05ccb848a8.
  
  Causing build error due to rebasing. Sorry for about it.
  

  • [DH] libavformat/dashenc.c

• Introducing WebM, an open web media project

  20 mai 2010, par noreply@blogger.com (christosap)

  A key factor in the web’s success is that its core technologies such as HTML, HTTP, TCP/IP, etc. are open and freely implementable. Though video is also now core to the web experience, there is unfortunately no open and free video format that is on par with the leading commercial choices. To that end, we are excited to introduce WebM, a broadly-backed community effort to develop a world-class media format for the open web.

  WebM includes :
  

  • VP8, a high-quality video codec we are releasing today under a BSD-style, royalty-free license
  • Vorbis, an already open source and broadly implemented audio codec
  • a container format based on a subset of the Matroska media container

  The team that created VP8 have been pioneers in video codec development for over a decade. VP8 delivers high quality video while efficiently adapting to the varying processing and bandwidth conditions found on today’s broad range of web-connected devices. VP8’s efficient bandwidth usage will mean lower serving costs for content publishers and high quality video for end-users. The codec’s relative simplicity makes it easy to integrate into existing environments and requires less manual tuning to produce high quality results. These existing attributes and the rapid innovation we expect through the open-development process make VP8 well suited for the unique requirements of video on the web.

  A developer preview of WebM and VP8, including source code, specs, and encoding tools is available today at www.webmproject.org.

  We want to thank the many industry leaders and web community members who are collaborating on the development of WebM and integrating it into their products. Check out what Mozilla, Opera, Google Chrome, Adobe, and many others below have to say about the importance of WebM to the future of web video.

  
  

  AMD

  ARM

  Brightcove

  Broadcom

  Collabora

  Digital Rapids

  Encoding.com

  Grab Networks

  iLinc

  INLET

  Kaltura

  Logitech

  MIPS

  Nvidia

  Ooyala

  Qualcomm

  Skype

  Sorenson

  Telestream
  

  Texas Instruments

  Verisilicon

  ViewCast

  Wildform

  
  

  Posted by Jeremy Doig, Engineering Director of video and Mike Jazayeri, Group Product Manager, Google