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• Compress video with ffmpeg4android library

  30 mars 2015, par Huy Tower

  I tried to follow ffmpeg4android library, and I get the problem when compressing the video, as the Log image below.

  I use intent to transfer to Compressing Media class,

  Intent intent = new Intent(this, CompressingMedia.class);
  
  intent.putExtra("file_path", mLlItems.get(0).getPath());
  
  startActivity(intent);

  This is the class was transfered to :

  public class CompressingMedia extends BaseWizard {
  
  
  
  @Override
  
  public void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
  
  
      Intent intent = getIntent();
  
  
  
      Log.d(Prefs.TAG, "path " + intent.getExtras().getString("file_path"));
  
      // /storage/emulated/0/DCIM/Camera/VID_20140312_090612.mp4
  
  
  
      String command = "ffmpeg -y -i " + intent.getExtras().getString("file_path") + 
  
              " -strict experimental -s 320x240 -r 15 -aspect 3:4 -ab 12288 -vcodec mpeg4 -b 2097152 -sample_fmt s16 /sdcard/out.mp4";
  
  
  
      // if you want to change the default work location (/sdcard/videokit/) use the uncomment the below method.
  
      // It must be defined before calling the copyLicenseAndDemoFilesFromAssetsToSDIfNeeded method,
  
      // in order for this method to copy the assets to the correct location.
  
              //      setWorkingFolder("/sdcard/videokit/");
  
  
  
      // this will copy the license file and the demo video file.
  
      // to the videokit work folder location.
  
      // without the license file the library will not work.
  
      copyLicenseAndDemoFilesFromAssetsToSDIfNeeded();
  
  
  
      commandStr = command;
  
      setCommand(commandStr);
  
  
  
      runTranscoing();
  
      }
  
  }

  Although I received the notification Transcoding Successfully, but it looks like the capacity of file after compressing is always be 0. (the log in the bottom of images)

  I don’t know the result as image below is good or not, I can not get the expected result - The video was compressed totally successfully.

  Someone know why after compressing the file is always be 0, please tell me. Thanks.

  This is the Log Cat :

  03-13 14:49:45.655 : I/ActivityManager(6065) : Timeline :
  Activity_launch_request id:app.cloudstringers time:38212359

  03-13 14:49:45.665 : V/Home(6065) : Global ID is 000400010007 ;Sell is 3

  03-13 14:49:45.770 : D/ffmpeg4android(6065) : path
  /storage/emulated/0/videokit/out.mp4

  03-13 14:49:45.770 : I/ffmpeg4android(6065) : workingFolderPath :
  /sdcard/videokit/

  03-13 14:49:45.775 : D/ffmpeg4android(6065) : Working directory exists,
  not coping assests (license file and demo videos)

  03-13 14:49:45.785 : D/ffmpeg4android(6065) : output directory exists.

  03-13 14:49:45.785 : I/ffmpeg4android(6065) : Command is set

  03-13 14:49:45.785 : I/ffmpeg4android(6065) : set
  remoteNotificationIconId : 0

  03-13 14:49:45.785 : D/ffmpeg4android(6065) : Client Cannot unbind -
  service not bound

  03-13 14:49:45.785 : D/ffmpeg4android(6065) : Client stopService()

  03-13 14:49:45.790 : W/ContextImpl(6065) : Implicit intents with
  startService are not safe : Intent
  act=com.netcompss.ffmpeg4android.FFMpegRemoteServiceBridge
  android.content.ContextWrapper.stopService:499
  com.netcompss.ffmpeg4android_client.BaseWizard.stopService:451
  com.netcompss.ffmpeg4android_client.BaseWizard.runTranscoing:285

  03-13 14:49:45.795 : I/ffmpeg4android(6065) :
   !!!!!!!!!!!!!!!!!!services.size() : 1

  03-13 14:49:45.795 : I/ffmpeg4android(6065) : putting Base categoty

  03-13 14:49:45.810 : D/ffmpeg4android(6065) : started :
  com.netcompss.ffmpeg4android.FFMpegRemoteServiceBridge

  03-13 14:49:45.810 : D/ffmpeg4android(6065) : Client startService()

  03-13 14:49:45.810 : D/ffmpeg4android(6065) : bindService() called

  03-13 14:49:45.815 : W/ContextImpl(6065) : Implicit intents with
  startService are not safe : Intent
  act=com.netcompss.ffmpeg4android.FFMpegRemoteServiceBridge
  android.content.ContextWrapper.bindService:517
  com.netcompss.ffmpeg4android_client.BaseWizard.bindService:462
  com.netcompss.ffmpeg4android_client.BaseWizard.runTranscoing:288

  03-13 14:49:45.820 : D/ffmpeg4android(6065) : Client bindService()

  03-13 14:49:45.935 : I/ffmpeg4android(6616) : =======service onCreate() :
  Stopping forground (to overcome 2.3.x bug)

  03-13 14:49:45.935 : I/ffmpeg4android(6616) : =======service
  onBind()=======

  03-13 14:49:45.940 : I/ffmpeg4android(6616) : ===onStartCommand called

  03-13 14:49:45.940 : I/ffmpeg4android(6616) : ===onStartCommand cat :
  Base

  03-13 14:49:45.940 : D/ffmpeg4android(6616) : onStartCommand,
  START_STICKY, base Command

  03-13 14:49:45.955 : I/ffmpeg4android(6616) : get
  remoteNotificationIconId : 0

  03-13 14:49:45.955 : I/ffmpeg4android(6616) : notifIcon is set

  03-13 14:49:45.955 : I/ffmpeg4android(6616) : Start RemoteService with
  notification id : 5326

  03-13 14:49:45.965 : I/ffmpeg4android(6616) : Run called.

  03-13 14:49:45.965 : D/ffmpeg4android(6616) : Sleeping, waiting for
  command

  03-13 14:49:45.970 : D/ffmpeg4android(6065) : Client
  onServiceConnected()

  03-13 14:49:45.970 : I/ffmpeg4android(6065) : invokeService called

  03-13 14:49:45.970 : I/Videokit(6065) : licenseCheck in path :
  /sdcard/videokit

  03-13 14:49:45.970 : I/Videokit(6065) : isLicExistsComplex...

  03-13 14:49:45.970 : I/Videokit(6065) : trying to open
  /sdcard/videokit/ffmpeglicense.lic

  03-13 14:49:45.970 : I/Videokit(6065) : license file found...

  03-13 14:49:45.970 : I/Videokit(6065) : time decoded : 1394535283

  03-13 14:49:45.970 : I/Videokit(6065) : timeStrDec 1394535283 is a valid
  number.

  03-13 14:49:45.970 : I/Videokit(6065) : time diff : 161702

  03-13 14:49:45.970 : I/Videokit(6065) : You used 1 of your 15 trial
  days.

  03-13 14:49:45.970 : I/ffmpeg4android(6065) : setting remote
  notification info

  03-13 14:49:45.970 : D/ffmpeg4android(6616) : command items num : 21

  03-13 14:49:45.970 : D/ffmpeg4android(6616) : command : ffmpeg -y -i
  /storage/emulated/0/videokit/out.mp4 -strict experimental -s 320x240
  -r 15 -aspect 3:4 -ab 12288 -vcodec mpeg4 -b 2097152 -sample_fmt s16 /sdcard/out.mp4

  03-13 14:49:45.970 : D/ffmpeg4android(6616) : workingFolder from remote :
  /sdcard/videokit

  03-13 14:49:45.970 : D/ffmpeg4android(6065) : deleteing :
  /sdcard/videokit/vk.log isdeleted : true

  03-13 14:49:45.975 : D/ffmpeg4android(6065) : deleteing :
  /sdcard/videokit/ffmpeg4android.log isdeleted : false

  03-13 14:49:45.975 : D/ffmpeg4android(6065) : deleteing :
  /sdcard/videokit/videokit.log isdeleted : true

  03-13 14:49:45.980 : D/ffmpeg4android(6065) : Client invokeService()

  03-13 14:49:45.980 : D/ffmpeg4android(6065) : Acquire wake lock

  03-13 14:49:46.265 : D/ffmpeg4android(6616) : Sleeping, waiting for
  command

  03-13 14:49:46.295 : D/ffmpeg4android(6065) : TranscodeBackground
  doInBackground started

  03-13 14:49:46.295 : I/ffmpeg4android(6616) : =======remote service
  runTranscoding ======

  03-13 14:49:46.340 : V/HomeAsync(6065) : TOTAL_SPACE is
  1 ;AVAILABLE_SPACE is 0.451

  03-13 14:49:46.345 : I/ActivityManager(6065) : Timeline : Activity_idle
  id : android.os.BinderProxy@423deed8 time:38213045

  03-13 14:49:46.345 : I/ActivityManager(6065) : Timeline : Activity_idle
  id : android.os.BinderProxy@420323a0 time:38213045

  03-13 14:49:46.565 : D/dalvikvm(6616) : Trying to load lib
  /data/app-lib/app.cloudstringers-2/libvideokit.so 0x41b285f0

  03-13 14:49:46.570 : D/dalvikvm(6616) : Added shared lib
  /data/app-lib/app.cloudstringers-2/libvideokit.so 0x41b285f0

  03-13 14:49:46.570 : I/Videokit(6616) : Loading native library compiled
  at 21:59:53 Oct 23 2013

  03-13 14:49:46.575 : I/ffmpeg4android(6616) : ===============Running
  command from thread path : /sdcard/videokit

  03-13 14:49:46.575 : I/Videokit(6616) : vk ffmpeg sdcardPath :
  /sdcard/videokit

  03-13 14:49:46.575 : I/Videokit(6616) : licenseCheck in path :
  /sdcard/videokit

  03-13 14:49:46.575 : I/Videokit(6616) : isLicExistsComplex...

  03-13 14:49:46.575 : I/Videokit(6616) : trying to open
  /sdcard/videokit/ffmpeglicense.lic

  03-13 14:49:46.575 : I/Videokit(6616) : license file found...

  03-13 14:49:46.575 : I/ffmpeg4android(6616) :
  =======ProgressBackgroundRemote doInBackground=========

  03-13 14:49:46.575 : I/Videokit(6616) : time decoded : 1394535283

  03-13 14:49:46.575 : I/Videokit(6616) : timeStrDec 1394535283 is a valid
  number.

  03-13 14:49:46.575 : I/Videokit(6616) : time diff : 161703

  03-13 14:49:46.575 : I/Videokit(6616) : You used 1 of your 15 trial
  days.

  03-13 14:49:46.575 : D/Videokit(6616) : license check rc : 0

  03-13 14:49:46.575 : D/Videokit(6616) : run() called verion 2.0

  03-13 14:49:46.575 : D/Videokit(6616) : run passing off to main()

  03-13 14:49:46.800 : D/ffmpeg4android(6065) : onServiceDisconnected

  03-13 14:49:48.640 : I/ffmpeg4android(6065) : Got real duration :
  00:00:07.78

  03-13 14:49:48.640 : I/ffmpeg4android(6065) : ==== getting
  currentVkLogSize from VK

  03-13 14:49:48.640 : D/ffmpeg4android(6065) : currentVkLogSize : 5751

  03-13 14:49:48.645 : I/ffmpeg4android(6065) : No ffmpeg4android_log
  file, using vk log

  03-13 14:49:48.645 : I/line(6065) : _rate, rate, width or height

  03-13 14:49:48.650 : I/line(6065) : Statistics : 0 seeks, 0 writeouts

  03-13 14:49:48.650 : I/line(6065) : Statistics : 72873 bytes read, 2
  seeks

  03-13 14:49:48.650 : D/ffmpeg4android(6065) : currentTimeStr : exit

  03-13 14:49:48.650 : D/ffmpeg4android(6065) : ============Found one of
  the exit tokens in the log============

  03-13 14:49:48.650 : I/ffmpeg4android(6065) : onProgressUpdate : 100

  03-13 14:49:48.650 : D/ffmpeg4android(6065) : Releasing wake lock

  03-13 14:49:48.650 : D/ffmpeg4android(6065) : TranscodeBackground
  onPostExecute

  03-13 14:49:48.700 : D/ffmpeg4android(6065) : /sdcard/videokit/null
  length in bytes : 0

  03-13 14:49:48.700 : D/ffmpeg4android(6065) : showNotifications

  03-13 14:49:48.700 : W/ffmpeg4android(6065) : output file is not set use
  the setOutputFilePath method to set the full output file path

  03-13 14:49:48.705 : I/ffmpeg4android(6065) : FFMPEG finished.

  03-13 14:49:48.710 : D/ffmpeg4android(6065) : releaseService()

  03-13 14:49:48.710 : D/ffmpeg4android(6065) : Client stopService()

  03-13 14:49:48.710 : W/ContextImpl(6065) : Implicit intents with
  startService are not safe : Intent
  act=com.netcompss.ffmpeg4android.FFMpegRemoteServiceBridge
  android.content.ContextWrapper.stopService:499
  com.netcompss.ffmpeg4android_client.BaseWizard.stopService:451
  com.netcompss.ffmpeg4android_client.BaseWizard.handleServiceFinished:513

• Video Conferencing in HTML5 : WebRTC via Socket.io

  
  5 février 2013, par silvia

  Six months ago I experimented with Web sockets for WebRTC and the early implementations of PeerConnection in Chrome. Last week I gave a presentation about WebRTC at Linux.conf.au, so it was time to update that codebase.

  I decided to use socket.io for the signalling following the idea of Luc, which made the server code even smaller and reduced it to a mere reflector :

   var app = require(’http’).createServer().listen(1337) ;
   var io = require(’socket.io’).listen(app) ;
   io.sockets.on(’connection’, function(socket) 
  
           socket.on(’message’, function(message) 
  
           socket.broadcast.emit(’message’, message) ;
  
       ) ;
  
   ) ;
  

  Then I turned to the client code. I was surprised to see the massive changes that PeerConnection has gone through. Check out my slide deck to see the different components that are now necessary to create a PeerConnection.

  I was particularly surprised to see the SDP object now fully exposed to JavaScript and thus the ability to manipulate it directly rather than through some API. This allows Web developers to manipulate the type of session that they are asking the browsers to set up. I can imaging e.g. if they have support for a video codec in JavaScript that the browser does not provide built-in, they can add that codec to the set of choices to be offered to the peer. While it is flexible, I am concerned if this might create more problems than it solves. I guess we’ll have to wait and see.

  I was also surprised by the need to use ICE, even though in my experiment I got away with an empty list of ICE servers – the ICE messages just got exchanged through the socket.io server. I am not sure whether this is a bug, but I was very happy about it because it meant I could run the whole demo on a completely separate network from the Internet.

  The most exciting news since my talk is that Mozilla and Google have managed to get a PeerConnection working between Firefox and Chrome – this is the first cross-browser video conference call without a plugin ! The code differences are minor.

  Since the specification of the WebRTC API and of the MediaStream API are now official Working Drafts at the W3C, I expect other browsers will follow. I am also looking forward to the possibilities of :

  • multi-peer video conferencing like the efforts around webrtc.io,
  • the media stream recording API,
  • and the peer-to-peer data API.

  The best places to learn about the latest possibilities of WebRTC are webrtc.org and the W3C WebRTC WG. code.google.com has open source code that continues to be updated to the latest released and interoperable features in browsers.

  The video of my talk is in the process of being published. There is a MP4 version on the Linux Australia mirror server, but I expect it will be published properly soon. I will update the blog post when that happens.

• How can I encode and segment audio files without having gaps (or audio pops) between segments when I reconstruct it ?

  16 mai 2013, par fenduru

  I'm working on a web application that requires streaming and synchronization of multiple audio files. For this, I am using the Web Audio API over HTML5 audio tags because of the importance of timing audio.

  Currently, I'm using FFMPEG's segmentation feature to encode and segment the audio files into smaller chunks. The reason I am segmenting them is so I can start streaming from the middle of the file instead of starting from the beginning (otherwise I would've just split the files using UNIX split, as shown here. The problem is that when I string the audio segments back together, I get an audio pop between segments.

  If I encode the segments using a PCM encoding (pcm_s24le) in a .wav file, the playback is seamless, which leads me to believe that the encoder is padding either the beginning or the end of the file. Since I will be dealing with many different audio files, using .wav would require far too much bandwidth.

  I'm looking to one of the following solutions to the problem :

  • How can I segment encoded audio files seamlessly,
  • How can I force an encoder to NOT pad audio frames using ffmpeg (or another utility), or
  • What is a better way to stream audio (starting at an arbitrary track time) without using an audio tag ?

  System Information

  • Custom node.js server
  • Upon upload of an audio file, node.js pipes the data into ffmpeg's encoder
  • Need to use HTML5 Web Audio API supported encoding
  • Server sends audio chunks 1 at a time through a WebSockets socket

  Thanks in advance. I've tried to be as clear as possible but if you need clarification I'd be more than willing to provide it.