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• How to work with data received from streaming services in my Java application ?

  24 novembre 2020, par gabriel garcia

  I'm currently trying to develop an "streaming client" as a way to organize multiple stream services (twitch, yt, mitele...) in a single desktop application written in Java.

  


  It basically relies on streamlink (which relies in ffmpeg) thanks to all it's features so my project could be defined as a frontend for streamlink.

  


  Straight to the point, one of the features I'd like to add it is the option to programatically record streams in the background and showing this video stream to the user when it's requested. Since there's also the possibility that the user wants to watch the stream without recording it, I'm forced to work with all that byte-like data sent from those streaming sources.

  


  So, the problem is basically that I do not know much about video coding/decoding/muxing/demuxing nor video theory like container structure, video formats and such.

  


  But the idea is to work with all the data sent from the stream source (let's say twitch, for example), read this bytes (I'm not sure what kind of information is sent to the client nor format) from the java.lang.Process's stdout and then present it to the client.

  


  Here's another problem : I don't know how to play video streams in JavaFX and I don't think it's even supported right now. So I would have to extract each frame and sound associated from the stdout and show them to the user each time a new frame is received (oups, another problem since I don't know when does each frame starts/ends since I'm reading each stdout's line).

  


  As a summary :

  


  

  • What kind of data am I receiving from the streaming source ?

  


  • How can I know when does each frame starts/stops ?

  


  • How can I extract the image and sound from each frame ?

  


  


  I hope I'm not asking too much and that you could shed some light upon my darkness.

  


• vf_pixdesctest : make config_props work properly when called multiple times.

  18 mars 2013, par Anton Khirnov

  vf_pixdesctest : make config_props work properly when called multiple times.
  

  • [DH] libavfilter/vf_pixdesctest.c

• Pseudo-streaming mp4 files does not work with flash player

  11 mai 2013, par faridv

  I've got a problem with streaming audio on my website. I thought I could put the MP3 file inside an MP4 container with h264 codec, so I can use pseudo-streaming ability of mp4 codec.

  The code I'm using to convert my files is :

  ffmpeg -i 1.mp3 -y -b:a 32K -vn 1.mp4

  Pseudo-streaming (seeking in not-loaded parts of media) now works in HTML5 player but not in any Flash media players such as JWPlayer or FlowPlayer.

  I've tested my files on both Apache server with h264 module enabled and Nginx with mod_mp4 enabled, but without any lucks.

  I tried MP4Box, QTIndexSwapper and even creating a real video file by mixing of an image loop and my audio file.

  ffmpeg -y -i joojoo.png -i 2.mp3 -vcodec mjpeg havij.mp4
  
  MP4Box -add havij.mp4 -isma havij_new.mp4

  What am I doing wrong ? What can I do to make it work ?