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• Passing FFmpeg encoder output to live 555 media server

  23 septembre 2013, par Ashutosh

  I need help on transmitting encoded output from encoder video output to live 555 media server.

      ret=avcodec_encode_video2(c,&pkt,(AVFrame*)&sc_dst_data,&gotim);
      source=ByteStreamMemoryBufferSource::createNew(*env,pkt.data,ret);
      if (source == NULL){}
      videoES = source;
      video_source=H264VideoStreamFramer::createNew(*env,videoES);
      video_sink->startPlaying(*video_source,afterPlaying, video_sink);
  

  The above codes doesn't transmit the streams properly.it breaks.any insights on how to do for a proper streaming in ffmpeg? Please help.

• ffmpeg - set metatag to .ts file

  23 septembre 2013, par Febin

  i have a .mp4 video, that is recorded in iphone4s.This video file contains 'Rotate - 180' metadata.

  When i am converting the .mp4 file to .ts using ffmpeg. I lost the 'Rotate' meta tag.

  The ffmpeg command that i have used is given below.

  ffmpeg -i input_file.mp4 -vcodec copy -acodec copy -vbsf h264_mp4toannexb output_file.ts

  is there any one know how to set 'Rotate' meta data to a .ts file ?

  or

  any other way to copy all meta datas in the input .mp4 file to output .ts file

  Thank you

• Android FFMPEG : Could not execute the ffmpeg from Java code

  23 septembre 2013, par Raj

  I am working on an Android app where I want to create a video from a list of static images. After doing some search on internet, it made me realized that using "FFMPEG" is the way to go in getting this thing done. So I got hold of this site: https://github.com/guardianproject/android-ffmpeg-java from where I downloaded the C library and the Java wrapper. I was able to compile the C library - of course not the way the instruction was laid out - but still I was able to get "ffmpeg" executable under /external/android-ffmpeg/ffmpeg directory. I copied that executable in my current directory and then copied it to a directory under Android where my app can access it. Then I called the provided Java wrapper but I am seeing some errors in the log file like follows:

  08-13 11:55:37.848: D/FFMPEG(29598): /data/data/com.sample/app_bin/ffmpeg -y -loop 1 -i /storage/emulated/0/usersnapshot/ffmpeg/image%03d.jpg -r 25 -t 2 -qscale 5 /storage/emulated/0/video/snapshot-video.mp4 
  08-13 11:55:37.898: I/ShellCallback : shellOut()(29598): /data/data/com.sample/app_bin/ffmpeg[1]: syntax error: '(' unexpected
  08-13 11:55:37.938: I/ShellCallback : processComplete()(29598): 1
  

  And following is the code snippet (where targetDirectoryForFFMPEG = directory where the images are stored):

  FfmpegController ffmpegController = new FfmpegController(this, targetDirectoryForFFMPEG);
  String out = videoOutPutFile.getPath();
          MediaDesc mediaIn = new MediaDesc();
          mediaIn.path = targetDirectoryForFFMPEG+"/image%03d.jpg";
          mediaIn.videoFps =  "25";   
          ffmpegController.convertImageToMP4(mediaIn, 2, out,new ShellCallback() {
  
              @Override
              public void shellOut(String shellLine) {
                  Log.i("ShellCallback : shellOut()", shellLine);
              }
  
              @Override
              public void processComplete(int exitValue) {
                  Log.i("ShellCallback : processComplete()", exitValue+"");
              }
          });
  

  Has anybody implemented this before? If yes, can you point me to what am I doing incorrect? I will provide more information if needed.

• How can I mux H.264 RTP output into a container using FFMPEG ?

  23 septembre 2013, par Grad

  I am working on the effects of network losses in video transmission. In order to simulate the network losses I use a simple program which drops random RTP packets from the output of H.264 RTP encoding.

  I use Joint Model (JM) 14.2 in order to encode the video. However, I don't use AnnexB format as my output, instead I choose the output as RTP packets. The JM output is generated as RTP packets with RTP headers and payload as a sequence. After that, some of RTP packets are dropped by using a simple program. Then, I decode the output by using also JM and it's error concealment methods. That gives me a YUV file as output. The format of the output is as follows:

       ----------------------------------------------------------------------
       | RTP Header #1 | RTP Payload #1 | RTP Header #2 | RTP Payload #2 |...
       ----------------------------------------------------------------------
  

  I want to make a subjective test with these bitstreams and it's very inconvenient to crowdsource this subjective test with GBs of video data. So, I want to mux these bitstreams into a container (i.e. AVI) by using FFMPEG. I have tried to decode these bitstreams with FFMPEG and FFPLAY; however, both of them didn't work. I also tried the following command and it didn't work, either.

      ffmpeg - f h264 -i  -vcodec copy -r 25 out.avi
  

  Which format or muxer should I use? Do I need to convert these files to any other format?

• Possible bug in OpenCV2.4 capturing frames from video

  23 septembre 2013, par Jav_Rock

  Could it be that there is a bug in OpenCV2.4 highgui for capturing frames from video in windows?

  I installed both the precompiled libraries, the ones compiled by me, I can compile everything perfectly and I can run my programs if

  they are image based. The problem is only for videos. OpenCV crashes in this function always:

   virtual IplImage* retrieveFrame(int)
      {
          unsigned char* data = 0;
          int step=0, width=0, height=0, cn=0;
  
          if(!ffmpegCapture ||
             !icvRetrieveFrame_FFMPEG_p(ffmpegCapture,&data,&step,&width,&height,&cn)) <-------CRASHES HERE
             return 0;
          cvInitImageHeader(&frame, cvSize(width, height), 8, cn);
          cvSetData(&frame, data, step);
          return &frame;
      }
  

  This is inside the class cap_ffmpeg.cpp and is called by VideoCapture.

  I tried versions 2.4.2 and 2.4.9. My programes were working finde with opencv2

  ---

  More information

  • Windows 7

  • Build the projects with cmake (important as it could be that cmake is not building/finding the right codecs)

  • VisualStudio 9 2008

  • OpenCV 2.4.2

  EDIT

  It looks like it is actually a bug, so, how can I solve this problem and change my code to be able to read avi files?