Video upload and streaming Record video – Android camera – Looxcie Upload video – http put – Thread Video streaming – Streaming server – Video formatting.

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<ul><li> Slide 1 </li> <li> Video upload and streaming Record video Android camera Looxcie Upload video http put Thread Video streaming Streaming server Video formatting Playing a video stream </li> <li> Slide 2 </li> <li> Record video Recording with phones camera is in another lecture Looxcie records video and holds it in the camera. Looxcie app pulls the video from camera to phone </li> <li> Slide 3 </li> <li> ftp package New app VideoStreamer Add user permission: Internet ftp package Download apache package from Get binary Decompress Add package Right on the src directory of the newly made app Select build path -&gt; configure build path Click add external jar. Browse to commons-net-2.2.jar Select Order and Export tab Click commons-net-2.2.jar </li> <li> Slide 4 </li> <li> Using ftp Make new class, FTPHelper Add member function, uploadFile FTPClient ftpClient = new FTPClient(); ftpClient.connect( "" ); ftpClient.login( "ftpuser", "ftpuser" ); System.out.println("Connected to"); System.out.print(ftpClient.getReplyString()); BufferedInputStream buffIn = null; buffIn = new BufferedInputStream(new FileInputStream("/mnt/sdcard/my_mov.mp4")); result = ftpClient.storeFile("my_vov.mp4", buffIn); if (result) { Log.e("DebugInfo","ftp trasnfer returned true"); } else { Log.e("DebugInfo","ftp trasnfer returned false"); } </li> <li> Slide 5 </li> <li> In VideoStreamer class At the end of onCreate, add FTP ftp = new FTP(); ftp.uploadFile(); ftp.uploadFile() Run If the file is very large, this will fail because the UI thread cannot take too long You must use theads </li> <li> Slide 6 </li> <li> threads asyncTask - easy threads In VideoStreamer class, add new class private class UploadFileTask extends AsyncTask {} Let eclipse add unimplemented methods Move from onCreate to doInBackground FTP ftp = new FTP(); ftp.uploadFile(); ftp.uploadFile() In onCreate, add new UploadFileTask().execute(); Run. </li> <li> Slide 7 </li> <li> Video Server Popular video servers Darwin Apple version Open source version Supports many formats including quicktime I couldnt get it working on windows Wowza Not open source Free (for a small number of users/downloaders) </li> <li> Slide 8 </li> <li> Try it Take video with phone Pull file from phone (in /mnt/sdcard/DCIM/Camera/*.3gp) Put file in C:\Program Files (x86)\Wowza Media Systems\Wowza Media Server 2.2.3\content Open VLC Select menu: media -&gt; network stream enter rtsp:// Where Vid3.mp4 is the name Does not work </li> <li> Slide 9 </li> <li> Streaming Video Format It is not always possible to stream a video captured by any video camera Wowza Media Server and Flash only support H.264 (AVC1, MPEG4 Part 10), AAC (MP4A, AAC, AAC+, HE-AAC) and MP3 in an MP4 file. 07-GSpot-Tool-to-inspect-MP4-%28QuickTime- container%29-video-audio-codecs The format can be checked Gspot: Shows the format details </li> <li> Slide 10 </li> <li> transcoding MS Expression can also make video files that can be streamed. But this requires manual effort, whereas ffmpeg can be run from command line or a script Ffmpeg can be used to transcode read a video file compressed in one set of codecs and recompress in another set Transcoding is very slow Works better if the source is low bit-rate. On phone video, select low rate Using ffmpeg is tricky The following perl code #!/usr/bin/perl d:\\uploadedContent\\ffmpeg\\bin\\ffmpeg.exe -i $ARGV[0] -strict experimental -acodec aac -ab 32k - vcodec libx264 -fpre libx264-medium.ffpreset -b 512k $ARGV[0].mp4 Call via&gt;&gt; perl filename.3gp These parameters can be adjusted Try it: Take video with camera Pull from phone, move to directory where ffmpeg is located (might need to copy FFPreset files to this directory) Run perl code Wait Move file to directory View with vlc </li> <li> Slide 11 </li> <li> Video streaming on android Change the VideoStreaming Activity so that it implements SurfaceHolder.Callback Add member variables private SurfaceView mPreview; private SurfaceHolder holder; private MediaPlayer mMediaPlayer; Add surface view to layout. Call it SurfaceView At the end of onCreate, mPreview = (SurfaceView) findViewById(; holder = mPreview.getHolder(); holder.addCallback(this); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); Add button, StartVideo Add callback Button startButton = (Button)findViewById(; startButton.setOnClickListener(new View.OnClickListener() {}); In onClick, add playVideo(); Make public void playVideo() { if (mMediaPlayer != null) { mMediaPlayer.release(); mMediaPlayer = null; } mMediaPlayer = new MediaPlayer(); //mMediaPlayer.setDataSource("/mnt/sdcard/DCIM/Camera/VID_20110502_143808.3gp"); // some file mMediaPlayer.setDataSource("rtsp://"); // some stream //mMediaPlayer.setDataSource("rtsp://"); mMediaPlayer.setDisplay(holder); mMediaPlayer.prepare(); mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); mMediaPlayer.start(); Run It takes a long time. But should run </li> <li> Slide 12 </li> <li> improvements Lots of things can be improved with callbacks Put progress bar to give the user feedback as video is starting In layout, add ProgressBar Add member variable ProgressBar progressBar; In onCreate, progressBar = (ProgressBar)findViewById(; progressBar.setVisibility(View.INVISIBLE); In playVideo At the beginning, add progressBar.setVisibility(View.VISIBLE); After mMediaPlayer = new MediaPlayer();, add mMediaPlayer.setOnPreparedListener(new OnPreparedListener() {}); In onPrepared, add progressBar.setVisibility(View.INVISIBLE); mMediaPlayer.start(); Change mMediaPlayer.prepare(); to mMediaPlayer.prepareAsync(); Remove mMediaPlayer.start(); Now run, and progress bar shows that something is happening But if an error occurs, the progress bar never stops Need to add more callbacks setOnErrorListener( to catch errors setOnCompletionListener(OnCompletionListener)., when it finished, to clean up screen or something setOnBufferingUpdateListener to track the buffer, this gives a percent </li> </ul>


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