Recherche avancée

Sur d’autres sites (5367)

• IOException when I use Runtime for FFMPEG [duplicate]

  20 octobre 2016, par Kilobyte

  This question already has an answer here :

  • Why do I get “Exception ; must be caught or declared to be thrown” when I try to compile my Java code ?
    
    6 answers
    

  I’m trying to write a java program that converts a video file (mp4) into an audio file (mp3) using FFMPEG, but I have an IOException.
  Is there something wrong in my code ?

  import java.lang.Runtime;
  
  
  
  public class Basketball {
  
  
  
  /**
  
   * @param args the command line arguments
  
   */
  
  public static void main(String[] args) {
  
      Process p = Runtime.getRuntime().exec("ffmpeg highlightsCLGS.mp4 -vn -ab 256 highlightsOutput.mp3");
  
  }
  
  }

  And this is the error.

  Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - unreported exception java.io.IOException; must be caught or declared to be thrown
  
  at basketball.Basketball.main(Basketball.java:21)

• Merge commit ’5d560d38deca1e4705e6d3784d737363b9c830fe’

  28 septembre 2016, par James Almer

  Merge commit ’5d560d38deca1e4705e6d3784d737363b9c830fe’
  * commit ’5d560d38deca1e4705e6d3784d737363b9c830fe’ :
  
    pixfmt : Add ARIB STD-B76 color transfer characteristic
  See 785038c92cc7fc1da437576382083246ca598fce
  Conflicts :
  
      libavcodec/options_table.h
  
      libavcodec/version.h
  
      libavutil/pixdesc.c
  
      libavutil/version.h
  Merged-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/options_table.h
  • [DH] libavcodec/version.h

• unsynchronized graph when h264 stream pause

  24 septembre 2016, par jorp

  Steps to reproduce :

  1.Connect android device to linux PC via USB.
  

  2.Run command on pc :
  adb shell screenrecord --output-format=h264 - | ffplay -analyzeduration 1 -

  3.Screenrecord(an Android system tool) will start to capture Android screen, encode by MediaCodec, generate h264 stream, send stream data to ffplay via pipe.

  4.PC will pop up ffplay window, and start display Android screen graphs

  ---

  If adb command runs when Android screen graph keeps static (no pixel color changes), ffplay window won’t pop up, until I touch somewhere to make Android graph changes.

  Question 1 : how to make ffplay to immidiately display the first frame of video when Android screen keeps static and adb commmand runs ?

  I’m not talking about "latency", if Android graph keeps changing, the graphic latency is within 2 second. It’s fast enough.

  when Android graph is static, run command without ffplay :
  adb shell screenrecord --output-format=h264 -

  screenrecord will output H264 stream data immidiately then pause.(See picture below).
  stream data comes first

  Does the data contain all information of first frame graph ?
  If so, how to make ffplay to display it immidiately ?

  ---

  Question 2 : how to make ffplay to immidiately display the latest frame of video when Android screen suddenly become static ?

  When Android screen start casting and Android graph suddenly become static, H264 data stream transfer will pause, while PC graph is different with Android graph.

  For example, I make a popup menu on Android disappear, there has been a fadeoff animation, PC graph pauses and display a translucent popup menu.(See picture below)

  latest graph on pc

  The first and latest frames of stream doesn’t display in ffplay immidiately, they are "missing".
  when Android screen go on changing, the "missing" frames displays.
  So it seems like the latest frames are always in buffer.

  I’ve tried adding these params to ffplay :
  

  -noinfbuf
-fflags nobuffer
-max_delay 0
-sync ext
-preset ultrafast
-tune zerolatency

  
  They cannot solve the problems

  Modifing Android ROM or screenrecord source, making a pixel color changes every frame, may solve the problems(I guess), but it would enlarge data stream, it’s the last choise.
  Is there any solution by adding params of ffplay, or by modifing screenrecord or ffplay source code ?

  PS : mplayer also has the same problem :
  mplayer -demuxer h264es -