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• How to stream a usb webcam to an android phone with ffmpeg and ffserver ?

  26 juillet 2015, par victor jung

  I am desperately trying to live stream the usb webcam from a linux computer to my android phone.
  I tried with ffmpeg and ffserver, to create the stream and with videoview in android to display it. I tried all the possible format/encoder/protocols possibilities but nothing worked. In most case I am able to open the stream in VLC in another PC, but I was never able to play on my phone. I always get this error :
  "can’t play this video"
  Here is my app code :

  package com.example.victor.videostream;
  
  import android.os.Bundle;
  
  import android.app.Activity;
  
  import android.view.View;
  
  import android.net.Uri;
  
  import android.widget.MediaController;
  
  import android.widget.VideoView;
  
  public class MainActivity extends Activity
  
   {
  
  VideoView videoView;
  
  @Override
  
   protected void onCreate(Bundle savedInstanceState)
  
  {
  
       super.onCreate(savedInstanceState);
  
       videoView = null;
  
       setContentView(R.layout.activity_main);
  
  
  
       videoView =(VideoView)findViewById(R.id.VideoView);
  
       MediaController mediaController= new MediaController(this);
  
       mediaController.setAnchorView(videoView);
  
  
  
   Uri uri = Uri.parse("http://host:port/mystream.3gp");
  
    videoView.setMediaController(mediaController);
  
    videoView.setVideoURI(uri);
  
    videoView.requestFocus();
  
    videoView.start();
  
         }
  
          }

  I read here

  about god encoding practice for android, but even with .3gp format encoded with mpeg4 as suggested it doesn’t work. Have any body once succeeded doing this ?
  I am also up to discover other possibilities to stream this webcam to my android if you have any ideas.
  this is the closest post I found but no solution...
  Hope somebody can help !
  thanks for reading.

• H.264 / H.265 Compression of a single Bitmap-Image

  3 septembre 2015, par kevf

  I hope someone can help me.

  I started researching different compression methods to compress Bitmap-Images lossless and lossy. The first methods i used were JPEG, JPEG-2000 and JPEG-XR. Now i want to compare these "standard" ones with H.264 and H.265, maybe they perform as well as they do for video compression.

  I tried using ffmpeg, but i can’t find out which parameters i need, there are plenty... So maybe someone can help me or link me to an Article/Howto or something else ?!

  Thanks a lot !

  EDIT :

  I used the following command :
  ffmpeg -i 01.bmp -c:v libx264 -preset veryslow -crf 40 test.avi

  but this created an 7kb file from an 76,8 kb input file... not very good compression ratio... is there any possibility to achieve more ?

• ffmpeg concatenate with dynamic chunks

  28 octobre 2015, par vongolashu

  The ffmpeg docs for concat lists the following way
  ffmpeg -f concat -i mylist.txt -c copy output

  The mylist.txt file contains file like
  file ’/path/to/file1’
  file ’/path/to/file2’
  file ’/path/to/file3’

  What I am looking is for a way to do this concat in a persistent way where the number of files can keep increasing, for example in livestreaming
  I will be sending chunks of video (mp4 files) of 10 seconds each to my server and want to concat/stitch them together to output to a RTMP stream (for livestreaming)

  If concat is not the proper way to do this, please suggest alternatives.

  Really interested to know how people use the above concept (I hope its how it works) to send video chunks from mobile device for livestreaming