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• Fast Video Streaming and Upload Android

  6 avril 2016, par vminind

  Fast Streaming & Uploading Videos On Mobile Apps with AWS S3

  Im developing a app witch has Android, iOS Clients were users can upload videos and photos and view as news feed. I store my video file on Amazone s3. Video length is limited to 30sec.

  When user is uploading 30 sec video from their gallery there are some high quality videos witch is even exceed 100MB so those video files take ages to upload. So i tried to convert them before upload using ffmpeg-android library but it also take almost same amount of time to convert the file so it seems this solution also point less. (convert in the scene reducing the video resolution and frame rate)

  Im using ExoPlayer to play videos

  Note : Videos uploading from iOS are not that huge files.

  I want videos to upload fast and stream fast. Its big help if anyone can share their thoughts on this.

• Android, fast video processing

  27 avril 2016, par Ilja Kosynkin

  I have troubles in my current project which requires video processing. Basically crop function (video should be squared), trimming (video shouldn’t be longer than 30 seconds) and quality reduction (bitrate should be equal 713K).
  I’ve succesfully embedded FFmpeg into application, all functions are working quite fine except one major detail - processing as per my boss is taking too long time. For video that have around 52 MB for 36 seconds it’s taking 50 seconds to perforn all the operations (I’m trimming video to 30 seconds before any other operation obviously). The problem is that on parallel project on iOS video processing takes like 10-15 seconds for greater files. I assume that it’s related to fact that they’re using Apple QuickTime format which obviusly was developed by Apple so it’s not surprising that it’s working quite fast.
  So well, it was introduction, now my question : is there any way for Android to process any video in any quality (for now we can assume that all videos are in h264) in time of 10-15 seconds (not more then in 30 seconds, as my boss said) ? Some alternative to FFmpeg, that can perform operations faster ? I’nm pretty sure that there is no possibility to perform such work in a such short time, since I already feel like I searched thought while Internet, but I want to make sure that there is really no possibility to do such work. If anyone can provide me links to solution more faster than FFmpeg or confirm that there is no such solution, I will be very gratefull.

  Update
  Thanks to Alex Cohn I’ve resolved this with MediaCodec. After a while, I got 20 seconds processing on 52MB video with cropping to square and lowering bitrate. For any future Googlers out of here I can suggest to take a look at this respository :
  Many stuff about MediaCodec
  and more precisely at this file : Extract, edit and encode again, video and audio

• Why when creating a video file from images using ffmpeg when playing the video file the quality is bad and the video is running too fast ?

  27 avril 2016, par Daniel Voit

   public void Start(string pathFileName, int BitmapRate)
  
          {
  
              try
  
              {
  
  
  
                  string outPath = pathFileName;
  
                  p = new NamedPipeServerStream(pipename, PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
                  ProcessStartInfo psi = new ProcessStartInfo();
  
                  psi.WindowStyle = ProcessWindowStyle.Hidden;
  
                  psi.UseShellExecute = false;
  
                  psi.CreateNoWindow = false;
  
                  psi.FileName = ffmpegFileName;
  
                  psi.WorkingDirectory = workingDirectory;
  
                  psi.Arguments = @"-f rawvideo -pix_fmt bgra -video_size 1920x1080 -i \\.\pipe\mytestpipe -c:v libx264 -crf 20 -r " + BitmapRate + " " + outPath;
  
                      //@"-f rawvideo -pix_fmt bgra -video_size 1920x1080 -i \\.\pipe\mytestpipe -c:v mpeg2video -crf 20 -r " + BitmapRate + " " + outPath;
  
  
  
                  process = Process.Start(psi);
  
                  process.EnableRaisingEvents = false;
  
                  psi.RedirectStandardError = true;
  
                  p.WaitForConnection();
  
              }
  
              catch (Exception err)
  
              {
  
                  Logger.Write("Exception Error: " + err.ToString());
  
              }
  
          }

  I tried to use either the first or second line.
  BitmapRate is set to 25
  I tried to change both 20 to 10 and also the BitmapRate to 10 or to 17. but the video on hard disk when playing it it’s only 3-4 seconds bad quality.
  I see all the images but too fast it’s like running I forward mode.

  Each file size is 8MB on hard disk.
  55 Bitmap files.
  The video file is 1072 KB

  Tried to google but I didn’t find any googd example to fix it.
  It’s not that it’s not creating the video file it does but with bad quality and running too fast.

  It’s strange why the created video file is so small if every file is 8MB and why so bad quality.

  The video

  video