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• Ffmpeg error with output file not specified on linux when executing from dockerized new process in .net-core

  29 août 2017, par DutchGuy

  Some time back i created a small program in full .net framework that could rip mp3 and then add meta-info and a thumbnail to it. For innovation sake i started porting the application to .net core. After that i thought it would be cool to run this in docker on Linux. It took some time but i got it working. Now i’m running into the issue where i can rip the mp3 from the video file but when i try to combine the meta-info, thumbnail and mp3 ffmpeg tells me "At least one output file must be specified"

  I added some checks so the program can run on Linux and Windows (to switch paths etc)

  What i tried :

  • running same argument structure on windows (works)
  • Manualy starting the encode on linux (works)
  • Simplifying the names, paths and titles used in the command
  • replacing extra spaces and special characters, only "-" and single spaces allowed

  Below i have an example of the command that does work when i execute it manually but produces the earlier mentioned error when my program executes it. Also keep in mind that ripping the mp3 from the video does result in the desired outputfile.

  ffmpeg -i "temp/vid-id.mp3" -i "temp/vid-id.jpg" -map 0:0 -map 1:0 -c copy -y -id3v2_version 3 -metadata title="title" -metadata artist="artist" -metadata album="album" "completed/file - name.mp3"

  To start this from .net-core context i use the snippet below :

  using (var ffmpegProcess = new Process())
  
  {
  
    ffmpegProcess.EnableRaisingEvents = false;
  
    ffmpegProcess.StartInfo.CreateNoWindow = true;
  
    ffmpegProcess.StartInfo.UseShellExecute = false;
  
    ffmpegProcess.StartInfo.FileName = ffmpegPath(); (returns "/bin/bash")
  
  
  
    string command = "ffmpeg " + arguments;
  
  
  
    ffmpegProcess.StartInfo.Arguments = "-c \" " + command + " \"";
  
  
  
    ffmpegProcess.Start();
  
    ffmpegProcess.WaitForExit();
  
    ffmpegProcess.Dispose();
  
  }

  arguments :

  String.Format("-i \"{0}\" -i \"{1}.jpg\" -map 0:0 -map 1:0 -c copy -y -id3v2_version 3 -metadata title=\"{2}\" -metadata artist=\"{3}\" -metadata album=\"{4}\" \"{5}\"",inputFile, albumArtFile, outputTitle, artist, outputAlbum, outputFile);

  To rip the mp3 from the video file i use the same method mentioned above with the following arguments :

  -i "temp/vid-id.mp4" -vn -ab 320k -y -threads 2 "temp/vid-id.mp3"

  This works as expected.
  Arguments :

  String.Format("-i \"{0}\" -vn -ab 320k -y -threads 2 \"{1}\"", inputFile, outputFile);

  Vid-id does not contain spaces, below is and example of how it could look :

  "abcd12ef-gh34i"

  Since the initial ripping is working i cant figure out why Ffmpeg complains about the second operation. The only real difference between the two operations is that in the second one the output-file name can contain spaces. But even then, running the same command manually does work and produces the desired file in the completed dir.

  Update
  After more troubleshooting i have now narrowed the problem down to the usage of the metadata arguments. Still can’t figure out why

  Update
  The problem is with the spaces in the naming i have chosen. On linux the spaces are interpreted as end of file name. Any pointer how i can still use the naming with spaces ?

• mp3 and multiple image convert to mp4 [on hold]

  16 mai 2017, par Henrik C Wiberg

  I need some guidance to convert an mp3 audio file, along with multiple photos to an mp4 file, using php/laravel.

  It must end with a mp4 file with a slideshow of images along with an audio file.

  How do you recommend me to begin the task ?
  I have this Json :

  {
  
  - data [
  
   {
  
      id: 1,
  
      name: "item 1",
  
      image: "image_1.jpg",
  
      start: "2017-01-01T02:00:00",
  
      end: "2017-01-01T02:30:00"
  
    },
  
    {
  
      id": 2,
  
      name: "item 2",
  
      image: "image_2.jpg",
  
      start: "2017-01-01T02:31:00",
  
      end: "2017-01-01T02:50:00"
  
    },
  
    {
  
      id": 3,
  
      name: "item 3",
  
      image: "image_3.jpg",
  
      start: "2017-01-01T02:51:00",
  
      end: "2017-01-01T03:00:00"
  
    }
  
  ],
  
  - meta {
  
     audiofile: {
  
      mp3: 'example.com/audio/audiofile.mp3',
  
      start: "2017-01-01T02:00:00",
  
      end: "2017-01-01T03:00:00"  
  
   }
  
  }   

  This json must be converted to one mp4 file, where image has to be placed and displayed on a timeline while ’audiofile.mp3’ is playing.

  Or do you know some code samples I can see ? :-)

• To large apk file when using .so files

  12 septembre 2014, par Arslan

  I am using a 3rd party API for camera library that is using ffmpeg frame recorder and .so files along with javacv.

  I am also using a 3rd party library for extracting meta data out from a video which also has some .so files

  When i merged all these files into only one folder "armeabi" my application did not work.
  So I have to copy all these files to all other folders "armeabi-v7a, mips, x86". Which works perfectly fine but obviously the size of the apk is now too large.

  Total size of these file are 20MB per folder. That make 80MB for all folder. My .apk size is 41MB. Please suggest ma what I can do to remove duplicate files/folders or reduce .apk size.

  Why I need all these folders armeabi, armeabi-v7a, mips, x86
  

  .so files in folder