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• Android Camera Capture using FFmpeg

  8 mars 2013, par Stryker33

  Am tryin' to take the preview frame generated by the android camera and pass the data[] to ffmpeg input pipe to generate a flv video.
  The command that I used was :

  ffmpeg -f image2pipe -i pipe: -f flv -vcodec libx264 out.flv

  I've also tried to force the input format to yuv4mpegpipe and rawvideo but with no success...
  The default format of the preview frame generated by android-camera is NV21.
  The way am invokin' ffmpeg is through the Process API and writing the preview frames data[] to the process' stdin...
  The onPreviewFrame() definition is as follows :

  public void onPreviewFrame(byte[] data, Camera camera)
  
  {   
  
      try
  
      {
  
          processIn.write(data);
  
      }
  
      catch(Exception e)
  
      {
  
          Log.e(TAG, FUNCTION + " : " + e.getMessage());
  
      }               
  
      camera.addCallbackBuffer(new byte[bufferSize]);
  
  }

  processIn is connected to the ffmpeg process stdin and buffersize is computed based on the documentation provided for addCallbackBuffer().
  Is there something that am doin' wrong...?

  Thanks...

• libavformat/flacdec : Workaround for truncated metadata picture size

  19 mai 2020, par Mattias Wadman

  libavformat/flacdec : Workaround for truncated metadata picture size
  Some flac muxers write truncated metadata picture size if the picture
  
  data do not fit in 24 bits. Detect this by truncting the size found inside
  
  the picture block and if it matches the block size use it and read rest
  
  of picture data.
  This workaround is only for flac files and not ogg files with flac
  
  METADATA_BLOCK_PICTURE comments and it can be disabled with strict level
  
  above normal. Currently there is a 500MB limit on truncate size to protect
  
  from large memory allocations.
  The truncation bug in lavf flacenc was fixed in e447a4d112bcfee10126c54eb4481fa8712957c8
  
  but based on existing broken files other unknown flac muxers seems to truncate also.
  
  Before the fix a broken flac file for reproduction could be generated with :
  
  ffmpeg -f lavfi -i sine -f lavfi -i color=red:size=2400x2400 -map 0:0 -map 1:0 -c:v:0 bmp -disposition:1 attached_pic -t 1 test.flac
  Fixes ticket 6333
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DH] libavformat/flac_picture.c
  • [DH] libavformat/flac_picture.h
  • [DH] libavformat/flacdec.c
  • [DH] libavformat/oggparsevorbis.c

• playing live streaming with video.js

  12 juin 2015, par randomuser1

  I want to stream on a webpage a video live that I receive from a server (with ffserver). So far when I write a very simple code :

      <code class="echappe-js">&lt;script src=&quot;http://www.andy-howard.com/js/libs/jquery-1.8.2.min.js&quot;&gt;&lt;/script&gt;
  &lt;script src=&quot;http://vjs.zencdn.net/4.12.6/video.js&quot;&gt;&lt;/script&gt;
     
  
  

  then it doesn’t work. But when I replace the line :

  <source src="http://10.172.180.235:8090/live.flv" type="video/x-flv">
  
  </source>

  with this one :

  <source src="http://vjs.zencdn.net/v/oceans.mp4" type="video/mp4">
  
  </source>

  then I can see the stream, but it comes from a file... Is there a way to display on my webpage live stream coming from ffserver ? Thanks.