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• Invalid pixel aspect ratio in ffmpeg

  26 septembre 2014, par dudeofea

  I want to scale a video to a certain size using ffmpeg, but I get the following error :

  ffmpeg -i Ad_939.avi -vf scale=1000:64 test_ad.avi       
  
  ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Sep 26 2014 10:31:06 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: 
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
  Input #0, avi, from 'Ad_939.avi':
  
    Metadata:
  
      encoder         : Lavf56.4.101
  
    Duration: 00:00:20.50, start: 0.000000, bitrate: 75 kb/s
  
      Stream #0:0: Video: wmv2 (WMV2 / 0x32564D57), yuv420p, 160x64, 68 kb/s, SAR 32:45 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc
  
  [mpeg4 @ 0x2305cc0] Invalid pixel aspect ratio 128/1125, limit is 255/255 reducing
  
  [mpeg4 @ 0x2305cc0] too many threads/slices (5), reducing to 4
  
  Output #0, avi, to 'test_ad.avi':
  
    Metadata:
  
      ISFT            : Lavf55.48.100
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1000x64 [SAR 19:167 DAR 2375:1336], q=2-31, 200 kb/s, SAR 128:1125 DAR 16:9, 24 fps, 24 tbn, 24 tbc
  
      Metadata:
  
        encoder         : Lavc55.69.100 mpeg4
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (wmv2 (native) -> mpeg4 (native))
  
  Press [q] to stop, [?] for help
  
  frame=  228 fps=0.0 q=2.0 size=     222kB time=00:00:09.50 bitrate= 191.6kbits/s
  
  frame=  468 fps=467 q=2.0 size=     435kB time=00:00:19.50 bitrate= 182.8kbits/s
  
  frame=  492 fps=456 q=2.0 Lsize=     458kB time=00:00:20.50 bitrate= 183.1kbits/s    
  
  video:441kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.981523%

  I’ve read around and it seems this was a past bug but that was 3 years ago. I’ve tried running this command with version 2.4.1, 2.3.3, 2.4.git (compiled from source Sept 16, 2014), and N-40951-g1ea7a3e (Newest static build) and they all fail.

  EDIT : When I say fail I mean that the video is not playing at the proper resolution. The file’s properties say that it is 1000x64 but VLC plays (as well as my website using a <video></video> tag) it with the original aspect ratio with the new width which is not what I want. I want a crunched up video the same size no matter what.

  Is there something I’m missing ?

• What's the best way to get video metadata from a MP4 file in ASP.Net MVC using C# ?

  1er janvier 2017, par Maddhacker24

  I’ve been searching on Google and StackOverflow for a good couple of hours. There seems to be a lot of similar questions on StackOverflow but they are all about 3-5 years old.

  Is using FFMPEG still the best way these days to pull metadata from a video file in a .NET web application ? And if so, what’s the best C# wrapper out there ?

  I’ve tried MediaToolkit, MediaFile.dll without any luck. I saw ffmpeg-csharpe but that looks like it hasn’t been touched in a few years.

  I haven’t found any current data on this subject. Is the ability to pull metadata from a video built into the latest version of .NET now ?

  I’m basically looking for any direction at this point.

  I should add that whatever I use could be invoked thousands of times per hour so it will need to be efficient.

• End of Piwik Mobile 1 – Focus is on Piwik Mobile 2

  2 septembre 2014, par Piwik Core Team — Community, Piwik Mobile Releases

  More than four years after its initial release, we will remove Piwik Mobile 1 from the Apple App Store and Google Play Store in one week. During that time the app was downloaded more than 60.000 times with an average rating of 4.6 and over 2000 ratings. Thank you to our community of users for all of this !

  Why we must focus on Piwik Mobile 2

  Unfortunately we do not have the resources to maintain Piwik Mobile 1 to be compatible with the latest iOS and Android updates (namely iOS 8 and Android L). The last update of Piwik Mobile 1 was over one year ago and the underlying framework, which we are using to develop the app, is nearly two years old. Making the code compatible with the current version of the underlying framework to support the latest platform versions would take us many weeks. As a little background : From the beginning Piwik Mobile 1 has been a free app and was developed by a single person Thomas in his spare time who is now focussing on Piwik Mobile 2.

  Can I still get it ?

  We are announcing this today so you get a chance to install the app via the Apple App Store and Google Play Store while it is still available.

  If you are one of the 87% of our Piwik Mobile 1 users who are already using Android 4+ or iOS 7+ then you can install Piwik Mobile 2 (make sure you upgrade your Piwik platform to 1.12 or 2.x recommended).

  What happens after the app is removed ?

  If you have already installed the app it won’t be removed from your device and you will still be able to use it. Android users can still download Piwik Mobile 1 but we cannot guarantee it will work on all devices. Lastly the code our free software is available on GitHub and you can build it from the source if you have to.

  The future of Piwik Mobile

  Piwik Mobile version 2.1 is currently in beta testing phase. This new version includes several useful new features such as support for Segmentation. If you use Android, give it a try !