Newest 'ffmpeg' Questions - Stack Overflow

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• Any Java library for live media streaming ? [on hold]

  29 novembre 2016, par Niconoid

  I'm developing a personal project which consists basically in a Java server reading the System's Stereo Mix and streaming all the content through HTTP into a HTML5 player in a webapp.

  I've been searching for days how to achieve this through a library as making it from ground up would be overly tedious and will take too much time. I've just found Red5, which isn't useful as I want to stream purely over HTTP, and ffserver (ffmpeg) that has been dropped months ago.

  Which alternatives do I have related to Java-based libraries in terms of live streaming over HTTP?

• ffmpeg : Generic stream (or file) re-streaming at lower bitrate

  29 novembre 2016, par Christian

  I often find streams on the internet that are high-bitrate only, or video streams that offer no audio-only stream.

  Is there a generic way to tell ffmpeg or ffserver, in my case on a small server, to input a given stream, digest it (eg. x264ify it or even HEVCify it, and convert the audio to AAC+ HEC at a low bitrate) and output
  a) a lightweight low-bitrate version or
  b) an audio-only stream of the ingested stream
  that can be viewed (in my case) by a mobile device that doesn't have the greatest connectivity?

  Thanks for any pointers in the right direction.

• Exception in thread "main" java.lang.UnsatisfiedLinkError : no jniavutil in java.library.path

  29 novembre 2016, par tpm900

  I am trying to split a video into frames using FFmpegFrameGrabber (using code I have seen in tutorials) but am getting an exception as follows:

  The code:

  public BufferedImage getNextFrame() {
      FFmpegFrameGrabber fFmpegFrameGrabber = new FFmpegFrameGrabber("resources/WebPage.mp4");
      BufferedImage bufferedImage = null;
      opencv_core.IplImage i;
      try {
          fFmpegFrameGrabber.start();
          i = fFmpegFrameGrabber.grab();
          bufferedImage = i.getBufferedImage();
      } catch (Exception e) {
          e.printStackTrace();
          try {
              fFmpegFrameGrabber.stop();
          } catch (Exception e1) {
              e1.printStackTrace();
          }
      }
      return bufferedImage;
  }
  

  The stack trace:

  Exception in thread "main" java.lang.UnsatisfiedLinkError: no jniavutil in java.library.path
  at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
  at java.lang.Runtime.loadLibrary0(Runtime.java:870)
  at java.lang.System.loadLibrary(System.java:1122)
  at com.googlecode.javacpp.Loader.loadLibrary(Loader.java:593)
  at com.googlecode.javacpp.Loader.load(Loader.java:489)
  at com.googlecode.javacpp.Loader.load(Loader.java:431)
  at com.googlecode.javacv.cpp.avutil.(avutil.java:76)
  at java.lang.Class.forName0(Native Method)
  at java.lang.Class.forName(Class.java:348)
  at com.googlecode.javacpp.Loader.load(Loader.java:453)
  at com.googlecode.javacv.cpp.avcodec.(avcodec.java:87)
  at com.googlecode.javacv.FFmpegFrameGrabber.(FFmpegFrameGrabber.java:73)
  at MP4VideoCodec.getNextFrame(MP4VideoCodec.java:16)
  at MP4VideoCodec.(MP4VideoCodec.java:12)
  at main.main(main.java:7)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
  Caused by: java.lang.UnsatisfiedLinkError: no avutil in java.library.path
  at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
  at java.lang.Runtime.loadLibrary0(Runtime.java:870)
  at java.lang.System.loadLibrary(System.java:1122)
  at com.googlecode.javacpp.Loader.loadLibrary(Loader.java:593)
  at com.googlecode.javacpp.Loader.load(Loader.java:481)
  ... 15 more
  

  How do I correct this exception?

• live streamming using ffmpeg for more than stream on the same time

  29 novembre 2016, par بسمة أمل

  I'm using this command to stream video in ffmpeg but when I stream more than 3 or 4 streams at the same time interruption happen although the process in my device doesn't exceed 50% I tried to use ffmpeg lib for each stream but interruption still happened

  this is my command :

   ffmpeg -re -i test.mp4 -i logo.png -vcodec libx264 -pix_fmt yuv420p -vb 2000000 -g 60 
  -vprofile main -acodec aac -ab 128000 -ar 48000 -ac 2 -vbsf h264_mp4toannexb 
  -strict experimental -filter_complex "[0][1]overlay=0:0" 
  -pass 1 -f mpegts udp://127.0.0.1:1234?pkt_size=1316
  

• How can I replace the audio of different time intervals of video multiple audio files using ffmpeg ?

  29 novembre 2016, par Suresh Kumar S

  I want to replace the specific portion of the audio in the video with multiple audio files. I am facing issues with FFMPEG in android. Help me for this. Thanks in advance :)

  Currently I use this command

  ffmpeg -i video.mov -i audio1.mp3 -i audio2.mp3 -filter_complex \
  "[1:a]atrim=end=10,asetpts=PTS-STARTPTS[a1]; \
  [2:a]atrim=end=10,asetpts=PTS-STARTPTS[a2]; \
  [a1][a2]concat=n=2:v=0:a=1[a] \"
  -map 0:v -map "[a]" -codec:v copy -codec:a libmp3lame -shortest output.mov