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• ERROR : libvpx decoder version must be >=0.9.1 [install ffmpeg in CentOS 6.3]

  4 septembre 2017, par Hu Le

  I want to install ffmpeg in CentOS 6.3
  It needs to install libvpx.

  I install libvpx before. Its version is 0.9.7.

  When I install ffmpeg, it indicates :

  [root@hostname ffmpeg]# PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure —prefix="$HOME/ffmpeg_build" —extra-cflags="-I$HOME/ffmpeg_build/include" —extra-ldflags="-L$HOME/ffmpeg_build/lib -ldl" —bindir="$HOME/bin" —pkg-config-flags="—static" —enable-gpl —enable-nonfree —enable-libfdk_aac —enable-libfreetype —enable-libmp3lame —enable-libopus —enable-libvorbis —enable-libvpx —enable-libx264 —enable-libx265

  ERROR: libvpx decoder version must be >=0.9.1

  If you think to configure made a mistake, make sure you are using the latest
  version from Git. If the latest version fails, report the problem to the
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  Include the log file "ffbuild/config.log" produced by configuring as this will help
  solve the problem.

  Now my rpm and yum is :

  [root@hostname ]# yum list libvpx

  Loaded plugins : fastestmirror

  Loading mirror speeds from cached hostfile

  • nux-dextop : li.nux.ro

  • rpmforge : mirrors.neusoft.edu.cn

  Installed Packages

  libvpx.x86_64 1.3.0-5.el6_5 installed

  Available Packages

  libvpx.i686 0.9.7.1-3.el6.nux nux-dextop

  I want to remove libvpx.i686 in this way :

  [root@hostname ffmpeg]# yum remove libvpx.i686

  Loaded plugins : fastestmirror

  Setting up Remove Process

  No Match for argument : libvpx.i686

  Loading mirror speeds from cached hostfile

  • nux-dextop : li.nux.ro

  • rpmforge : mirrors.neusoft.edu.cn

  Package(s) libvpx.i686 available, but not installed.

  No Packages marked for removal

  How to remove libvpx.i686 completely ?

• FFmpeg in Java Android

  14 juin 2021, par Jomy

  I am currently trying to get a library to work so that I can convert a wav file to mp3.

  


  The library I'm using is AndroidAudioConverter.

  


  I tried adding this to my Application class :

  


  public class App extends application {
    @Override
    public void onCreate() {
        AndroidAudioConverter.load(this, new ILoadCallback() {
            @Override
            public void onSuccess() {
                android.util.Log.d(TAG, "FFmpeg is supported by the device. Succesfully loaded AndroidAudioConverter library.");
            }
            @Override
            public void onFailure(Exception error) {
                // FFmpeg is not supported by device
                Log.w(TAG, "FFmpeg is not supported by this device.", error);
            }
        });
    }
}


  


  Which gave me the following error :

  


  W/Application: FFmpeg is not supported by this device.
    java.lang.Exception: Failed to loaded FFmpeg lib
        at cafe.adriel.androidaudioconverter.AndroidAudioConverter$1.onFailure(AndroidAudioConverter.java:50)
        at com.github.hiteshsondhi88.libffmpeg.FFmpegLoadLibraryAsyncTask.onPostExecute(FFmpegLoadLibraryAsyncTask.java:54)
        at com.github.hiteshsondhi88.libffmpeg.FFmpegLoadLibraryAsyncTask.onPostExecute(FFmpegLoadLibraryAsyncTask.java:8)
        at android.os.AsyncTask.finish(AsyncTask.java:771)
        at android.os.AsyncTask.access$900(AsyncTask.java:199)
        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:788)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)


  


  I looked into the AndroidAudioConverter.java file of the library and found how the load method works. The AndroidAudioConverter library uses ffmpeg-android-java as a dependency. It uses the ffmpeg-android-java library inside the load method like so :

  


  try {
            FFmpeg.getInstance(context).loadBinary(new FFmpegLoadBinaryResponseHandler() {
                        @Override
                        public void onStart() {

                        }

                        @Override
                        public void onSuccess() {
                            loaded = true;
                            callback.onSuccess();
                        }

                        @Override
                        public void onFailure() {
                            loaded = false;
                            callback.onFailure(new Exception("Failed to loaded FFmpeg lib"));
                        }

                        @Override
                        public void onFinish() {

                        }
                    });
        } catch (Exception e){
            loaded = false;
            callback.onFailure(e);
        }
    }


  


  So I tried copying this in my code to see what it would give. I replaced catch (exception e) {...} with catch(exception e) {e.printStackTrace();

  


  After running I got this error :

  


  E/FFmpeg: issue in coping binary from assets to data. 
    java.io.FileNotFoundException: x86/ffmpeg
        at android.content.res.AssetManager.nativeOpenAsset(Native Method)
        at android.content.res.AssetManager.open(AssetManager.java:874)
        at android.content.res.AssetManager.open(AssetManager.java:851)
        at com.github.hiteshsondhi88.libffmpeg.FileUtils.copyBinaryFromAssetsToData(FileUtils.java:29)
        at com.github.hiteshsondhi88.libffmpeg.FFmpegLoadLibraryAsyncTask.doInBackground(FFmpegLoadLibraryAsyncTask.java:27)
        at com.github.hiteshsondhi88.libffmpeg.FFmpegLoadLibraryAsyncTask.doInBackground(FFmpegLoadLibraryAsyncTask.java:8)
        at android.os.AsyncTask$3.call(AsyncTask.java:394)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:305)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:923)



  


  So what I'm guessing here is that the FFmpeg library is not installed since the file cannot be found ?

  


  I dug some deeper and looked into the FFmpeg.java file inside the ffmpeg-android-java library and found the loadBinary method inside the FFmpeg class. It uses that FFmpegLoadLibraryAsyncTask and there I found that the FFmpeg file is defined like this : File ffmpegFile = new File(FileUtils.getFFmpeg(context)); and inside FileUtils.java :

  


      static final String ffmpegFileName = "ffmpeg";

    static File getFilesDirectory(Context context) {
        // creates files directory under data/data/package name
        return context.getFilesDir();
    }

    static String getFFmpeg(Context context) {
        return getFilesDirectory(context).getAbsolutePath() + File.separator + FileUtils.ffmpegFileName;
    }


  


  So I ran : System.out.println(this.getFilesDir() + File.separator + "ffmpeg");.
And got as output : I/System.out: /data/user/0/be.ksa.voetje/files/ffmpeg.
A simple System.out.println(new File(this.getFilesDir() + File.separator + "ffmpeg").exists()); tells me that this file indeed does not exist.

  


  And this is where I'm at. I have no experience with FFmpeg, so forgive me if I'm looking over something obvious.

  


  How can I fix this problem ?

  


• Dealing with problems in FLAC audio files with ffmpeg

  15 janvier 2020, par Seamus

  I have gotten a set of FLAC (audio) files from a friend. I copied them to my Sonos music library, and got set to enjoy a nice album. Unfortunately, Sonos would not play the files. As a result I have been getting to know ffmpeg.

  Sonos’ complaint with the FLAC files was that it was "encoded at an unsupported sample rate". With rolling eyes and shaking head, I note that the free VLC media player happily plays these files, but the product I’ve paid for (Sonos) - does not. But I digress...

  ffprobe revealed that the FLAC files contain both an Audio channel and a Video channel :

  $ ffprobe -hide_banner  -show_streams "/path/to/Myaudio.flac"
  
  
  
  
  
      Duration: 00:02:23.17, start: 0.000000, bitrate: 6176 kb/s  
  
      Stream #0:0: Audio: flac, 176400 Hz, stereo, s32 (24 bit)  
  
      Stream #0:1: Video: mjpeg (Progressive), yuvj444p(pc, bt470bg/unknown/unknown), 450x446 [SAR 72:72 DAR 225:223], 90k tbr, 90k tbn, 90k tbc (attached pic)  
  
      Metadata:  
  
        comment         : Cover (front)  

  Cool ! I guess this is how some audio players are able to display the ’album artwork’ when they play a song ? Note also that the Audio stream is reported at 176400 Hz ! Apparently I’m out of touch ; I thought that 44.1khz sampling rate effectively removed all of the ’sampling artifacts’ we could hear. Anyway, I learned that Sonos would support a max of 48kHz sampling rate, and this (the 176.4kHz rate) is what Sonos was unhappy about. I used ffmpeg to ’dumb it down’ for them :

  $ ffmpeg -i "/path/to/Myaudio.flac" -sample_fmt s32 -ar 48000 "/path/to/Myaudio48K.flac"

  This seemed to work - at least I got a FLAC file that Sonos would play. However, I also got what looks like a warning of some sort :

  [swscaler @ 0x108e0d000] deprecated pixel format used, make sure you did set range correctly
  [flac @ 0x7feefd812a00] Frame rate very high for a muxer not efficiently supporting it.
  Please consider specifying a lower framerate, a different muxer or -vsync 2

  A bit more research turned up this answer which I don’t quite understand, and then in a comment says, "not to worry" - at least wrt the swscaler part of the warning.

  And that (finally) brings me to my questions :

  1.a. What framerate, muxer & other specifications make a graphic compatible with a majority of programs that use the graphic ?

  1.b. How should I use ffmpeg to modify the Video channel to set these specifications (ref. Q 1.a.) ?

  2.a. How do I remove the Video channel from the .flac audio file ?

  2.b. How do I add a Video channel into a .flac file ?

  EDIT :

  I asked the above (4) questions after failing to accomplish a ’direct’ conversion (a single ffmpeg command) from FLAC at 176.4 kHz to ALAC (.m4a) at 48 kHz (max supported by Sonos). I reasoned that an ’incremental’ approach through a series of conversions might get me there. With the advantage of hindsight, I now see I should have posted my original failed direct conversion incantation... we live and learn.

  That said, the accepted answer below meets my final objective to convert a FLAC file encoded at 176.4kHz to an ALAC (.m4a) at 48kHz, and preserve the cover art/video channel.