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• How to use guardianproject's ffmpeg library for android

  24 juillet 2014, par Abdul Qadir

  Here’s the link to the ffmpeg android library I’m trying to use :
  https://github.com/guardianproject/android-ffmpeg

  I’m trying to follow what is written in this post in order to use it :
  http://stackoverflow.com/a/21553337/1462190

  1. Included the ffmpeg library project into the eclipse. (File > Import)
  2. Added the ffmpeg library to my application. (Right clicked my project’s name > Properties > Android > Library)

  However I can’t get it to work. I get the following errors :

  In console :

  android-ffmpeg-library] Could not find android-ffmpeg-library.apk!

  In DDMS :

  07-24 17:00:24.990: E/AndroidRuntime(23935): java.lang.NoClassDefFoundError: org.ffmpeg.android.FfmpegController

  I have no clue to what could be the problem. Although i’m noticing one thing which I think I should mention here. After the second step, when I add the library, I see the green check indicating everything is fine. But after I run my application (which crashes before it launches) I see a red cross which of course indicates something’s wrong.

  Before I run my application :

  

  After I run my application :

  

  Any help would be appreciated ! thank you !

• Hello i need a some istructions to use ffmpeg, I would like a code to get media file info

  16 juillet 2014, par user3547175

  I want to start by saying that i don’t know how to use FFMPEG in C#. I have a program that reads the information of a media file, I use this code about resolution, bitrate

  var player = new WindowsMediaPlayer();
  
  var clip = player.newMedia(file.FullName);
  
  lblLenght_.Text = (TimeSpan.FromSeconds(clip.duration)).ToString();       
  
  
  
  
  
  
  
  ShellFile shellFile = ShellFile.FromFilePath(file.FullName);
  
  lblFPS_.Text = (shellFile.Properties.System.Video.FrameRate.Value / 1000).ToString();
  
  
  
  lblHeight_.Text = shellFile.Properties.System.Video.FrameHeight.Value.ToString() + " px";
  
  lblWidth_.Text = shellFile.Properties.System.Video.FrameWidth.Value.ToString() + " px";
  
  lblResolution_.Text = shellFile.Properties.System.Video.FrameWidth.Value.ToString() + "x" + shellFile.Properties.System.Video.FrameHeight.Value.ToString() + " px";
  
  blBitrate_.Text = (shellFile.Properties.System.Video.TotalBitrate.Value / 1000).ToString() + " kb/s";

  but the problem is that ShellFile supports only a few formats, so I found some FFMPEG uses but I don’t know how to work with it. Can someone post the solution or some link to learn how to use it about my problem ?

• avformat/mxfenc : set/force channelcount in MXF D-10

  25 juin 2014, par Gaullier Nicolas

  avformat/mxfenc : set/force channelcount in MXF D-10
  There are interoperability issues with D-10 related to the channelcount property in the generic sound essence descriptor.
  On one side, SMPTE 386M requires channel count to be 4 or 8, other values being prohibited.
  
  The most widespread value is 8, which seems straightforward as it is the actual size of the allocated structure/disk space.
  
  At the end, it appears that some vendors or workflows do require this descriptor to be 8, and otherwise just "fail".
  On the other side, at least AVID and ffmpeg do write/set the channel count to the exact number of channels really "used",
  
  usually 2 or 4, or any other value. And on the decoding side, ffmpeg (for example) make use of the channel count for probing
  
  and only expose this limited number of audio streams
  
  (which make sense but has strong impact on ffmpeg command line usage, output, and downstream workflow).
  At the end, I find it pretty usefull to simply give ffmpeg the ability to force/set the channel count to any value the user wants.
  
  (there are turnaround using complex filters, pans, amerge etc., but it is quite boring and requires the command line to be adapted to the input file properties)
  Reviewed-by : Matthieu Bouron <matthieu.bouron@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/mxfenc.c