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• How to "filter" a file through command line before apache sends it to client ?

  1er septembre 2020, par Timothe Jahan

  I have large collection of video files which are available on our website.
For each video we have multiple quality and language, so in order to save space we store only 1 file, which contains all audio and video tracks.

  


  Our streaming server can handle these multitrack files in order to serve only the useful part to each user, but we also make them available for download through the apache web server.
Currently, when a user request a file (certain quality, certain language), we first create a temporary file with only his needs, and give him for download.
I would like to remove this intermediate step and extract on the fly.
Extraction can be done by ffmpeg, but I need to have apache "pipe" the file through ffmpeg before sending the bytes out. Do you have any way of doing this.

  


  example :

  


  


  Filename_multi.mp4 [SD,HD,fr,en,ru]
User request : Filename_HD_fr.mp4 [HD,fr]
Apache fetch the file Filename_multi.mp4 and pipe it through an ffmpeg command and send the bytes as > they are encoded, not waiting for the end.

  


  


  Note this is on linux, and the ffmpeg part is not a problem.

  


  Thx
Timothé

  


• mkv file progressively out of sync

  29 avril 2017, par Piruzzolo

  I have a bunch of mkv files, with FLAC as the audio codec and FFV1 as the video one.

  The files were created using an EasyCap acquisition dongle from a VCR analog source. Specifically, I used VLC’s "open acquisition device" prompt and selected PAL. Then, I converted the files (audio PCM, video raw YUV) to (FLAC, FFV1) using

  ffmpeg.exe -i input.avi -acodec flac -vcodec ffv1 -level 3 -threads 4 -coder 1 -context 1 -g 1 -slices 24 -slicecrc 1 output.mkv

  Now, the files are progressively out of sync. It may due to the fact that while (maybe) the video has a constant framerate, the FLAC track has variable framerate. So, is there a way to sync the track to audio, or something alike ? Can FFmpeg do this ? Thanks

  EDIT

  On Mulvya hint, I plotted the difference in sync at various times ; the first column shows the seconds elapsed, the second shows the difference - in secs. The plot seems to behave linearly, with 0.0078 as a constant slope. NOTE : measurements taken by hands, by means of a chronometer

  

  EDIT 2

  Playing around with VirtualDub, I found that changing the framerate to 25 fps from the original 24.889 (Video->Frame rate...->Change frame rate to) and using the track converted to wav definitely does work. Two problems, though : VirtualDub crashes when importing the original FFV1-FLAC mkv file, so I had to convert the video to H264 to try it out ; more, I find it difficult to use an external encoder to save VirtualDub output.

  So, could I avoid using VirtualDub, and simply use ffmpeg for it ? Here’s the exported vdscript :

      VirtualDub.audio.SetSource("E:\\Cassette\\Filmini\\masters\\Cassetta 4_track2_ita.wav", "");
  
      VirtualDub.audio.SetMode(0);
  
      VirtualDub.audio.SetInterleave(1,500,1,0,0);
  
      VirtualDub.audio.SetClipMode(1,1);
  
      VirtualDub.audio.SetEditMode(1);
  
      VirtualDub.audio.SetConversion(0,0,0,0,0);
  
      VirtualDub.audio.SetVolume();
  
      VirtualDub.audio.SetCompression();
  
      VirtualDub.audio.EnableFilterGraph(0);
  
      VirtualDub.video.SetInputFormat(0);
  
      VirtualDub.video.SetOutputFormat(7);
  
      VirtualDub.video.SetMode(3);
  
      VirtualDub.video.SetSmartRendering(0);
  
      VirtualDub.video.SetPreserveEmptyFrames(0);
  
      VirtualDub.video.SetFrameRate2(25,1,1);
  
      VirtualDub.video.SetIVTC(0, 0, 0, 0);
  
      VirtualDub.video.SetCompression();
  
      VirtualDub.video.filters.Clear();
  
      VirtualDub.audio.filters.Clear();

  The first line imports the wav-converted audio track.
  Can I set an equivalent pipe in ffmpeg (possibly, using FLAC - not wav) ? SetFrameRate2 is maybe the key, here.

• New Piwik 2.0 public beta for testers

  16 octobre 2013, par matt

  Dear Piwik community,

  We are excited to announce the release of the first public beta version of Piwik 2.0.

  This is software still in development and we really don’t recommend that you run it on a production site — set up a test database just to play with the new version.

  Piwik 2.0 is a major update from Piwik 1.12 and is the result of 5 months of work on the platform !

  What’s changed ?

  We focused on upgrading Piwik source code quality and maintainability : upgraded to PHP 5.3 using namespaces, changed templating library to Twig, started using composer, using Less as well as css, improved QA tests, introduced new Screenshots tests, refactored translations to nice JSON format, refactored LOTS of code, added documentation….

  There also performance improvements, in particular the “All Websites Dashboard” is now usable with 20,000+ websites !

  Several bugs were fixed and we added some very-special-and-exciting new features.

  See the list of closed tickets in Piwik 2.0, or learn more about our recent developments in the Development update blog post.

  Piwik 2 is the open platform for your analytics data !

  How to update to Piwik 2.0 beta ?

  1. You can tell Piwik to use the latest beta from within the user interface. See this FAQ : [piwik.org]
  2. or alternatively you may download the latest beta from the build server, upload these files on top of your existing piwik files, and visit Piwik to upgrade.

  Beta cycle
  The more you test the beta, the more stable our release candidates and our final release will be. If you think you’ve found a bug, you can post it in this forum post. Or, if you’re comfortable writing a reproducible bug report, file one. The stable Piwik 2.0 release is planned for mid-November !

  Happy testing,

  PS : if you are interested in professional support for Piwik, or custom feature development, contact the Piwik experts.