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• create associative data from ffmpeg string result into python

  9 septembre 2018, par Question

  To perform video operations I’m using python with the support of ffmpeg. After I’ve uploaded videos, I need to resize them, so I’ll follow these instructions to calculate the video dimensions :

  link_v = "C:/video/video.mp4"
  
  ffmpeg = "ffprobe -v error -show_entries stream=width,height -of default=noprint_wrappers=1 %s"% link_v
  
  info = check_output(ffmpeg, shell=True)
  
  print(info)

  The console result is something like this :

  width=350
  
  height=350

  But I do not care about this, when it is printed as if it were a string, because the real data would be : b’width=350\r\nheight=350\r\n’ or [’width=350\r\nheight=350\r\n’].

  What I really want to see is an associative data : "width : 350, height : 350", once I get then I would call for example width in the info mode [’width’], how can I get this result ?

• How to make command string for ffmpeg in c# correctly ?

  9 octobre 2018, par Rolens Centottantaquattro

  I wrote this code for make a video from still image and audio with ffmpeg in c#.
  I wrote the argument string and inserted the variable parameters between braces.
  Trying to start the program nothing happens. Something wrong with the string or something ?

  string image = folderInput.SelectedPath + "/" + name+ ".jpg";
  
  bmp.Save(immagine);
  
  string audioMixing = folderInput.SelectedPath + "/" + name + ".wav";
  
  string videoOutput = folderOutput.SelectedPath + "/" + name + ".mp4";                   
  
  const string templateArgumentsVideo = " -loop l -i {0} -i {1} -c:v libx264 -tune stillimage c:a aac -b:a 192k -pix_fmt yuv420p -shortest {2} -y";
  
  var argumentsVideo = string.Format(templateArgumentsVideo,image,audioMixing,videoOutput);
  
  
  
  Process makeVideo = new Process();
  
  makeVideo.StartInfo.UseShellExecute = false;
  
  makeVideo.StartInfo.RedirectStandardOutput = true;
  
  makeVideo.StartInfo.CreateNoWindow = true;
  
  makeVideo.StartInfo.FileName = (Convert.ToString(Environment.CurrentDirectory)) + "\\ffmpeg.exe";
  
  makeVideo = Process.Start(makeVideo.StartInfo.FileName, argumentsVideo);
  
  makeVideo.WaitForExit();

• lavf/dashenc : set FLAC manifest codec string to "flac"

  14 novembre 2018, par Jan Ekström

  lavf/dashenc : set FLAC manifest codec string to "flac"
  Internally in ISOBMFF the FLAC-in-ISOBMFF draft uses "fLaC"
  
  as the identifier for FLACSampleEntry, and there seems to be no
  
  MPEG-DASH specification for the in-manifest identifier for FLAC.
  After testing the browsers' implementations, it seems like all of
  
  the major browser vendors have decided to utilize the MIME type for
  
  FLAC ("audio/flac") as the identifier. This change set leads to
  
  that string being utilized for FLAC streams instead of the sample
  
  entry identifier ("fLaC"), which is the default behavior.
  Verified by auri_ on IRC to play with the major browsers.
  

  • [DH] libavformat/dashenc.c