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• open h.264 encoded stream and write the encoded AVPackets into mp4-file

  29 novembre 2013, par Olgen2013

  I want to read/open a h264 encoded video-file (.mp4) or live stream (rtp, tcp) and save this video or a part of this video into a h264 encoded mp4-file. I don't want to decode the input stream. So I want to read the AVPackets from the input stream and save them into a new container (output file (mp4)).

  So far I am able to read a video-file or live stream. For some test cases I implemented a method which decodes the input stream and stores each frame as image. This works fine, too.

  For the output part, which should write the input AVPackers into a mp4-file, I followed this example : http://libav.org/doxygen/release/0.8/libavformat_2output-example_8c-example.html.
  I adjusted the example for my case, without the encoding part of raw data.

  And I think there is my problem : while creating the AVCodecContex, which is also required to create the encoding parameters in the header of the output file.

  But my main problem is that I don't know which parameters of AVCodecContex are required for h264/mp4 and which values I need for each parameter. I tried to use the AVCodecContex from the input file/stream but partial there occur errors for some parameters. And like I said I don't know which parameters are really necessary for h264/mp4.

  I work with these versions :

  • libavutil 51. 22. 1 / 51. 22. 1
  • libavcodec 53. 35. 0 / 53. 35. 0
  • libavformat 53. 21. 1 / 53. 21. 1
  • libavdevice 53. 2. 0 / 53. 2. 0
  • libavfilter 2. 15. 0 / 2. 15. 0
  • libswscale 2. 1. 0 / 2. 1. 0
  • libpostproc 52. 0. 0 / 52. 0. 0

  What do you think ? Is my approach completely wrong or what could be the issue ?

  If you need further information just send me a message !

  Thanks for your help !
  Olgen

• Piwik at Free and Open Source Software Conference

  26 août 2013, par thomas — Community

  Last weekend Fabian and Thomas from the Piwik team have represented Piwik at the 8th FrOSCon in St. Augustin (Germany, near Cologne).

  At our booth we handed out Piwik brochures, our new awesome Stickers, and of course sweets. Many Piwik users came by and we were glad to gather some interesting feature ideas and feedback. Thank you ! We also helped a few people troubleshoot issues on their servers and we introduced Piwik to many visitors stopping by the booth.

  We cannot put into words what the incredible FrOSCon team and all the people who helped have achieved. Thank you for making this conference possible ! We really enjoyed FrOSCon and we hope to be there next year again.

• ffmpeg avio_open() failed to open output file for writing encoded streams

  13 juin 2017, par Sureshkumar Menon

  i am trying to convert raw PCM into mp4 using ffmpeg ported for android.I am facing a problem in which the avio_open return negative value saying Could not open sample.mp4 which is the output file saved in sdcard.i have given filepath like /sdcard/sample.mp4 .

  avio_open(&oc->pb, filename, AVIO_FLAG_WRITE)  returns -2

  /* open the output file, if needed */

   if (!(fmt->flags & AVFMT_NOFILE)) {
  
       if (avio_open(&oc->pb, filename, AVIO_FLAG_WRITE) < 0) {
  
           fprintf(stderr, "Could not open '%s'\n", filename);
  
           return 1;
  
       }
  
   }

  any idea ?