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• Create conversion queue using ffmpeg and C #

  22 octobre 2017, par Alexei Agüero Alba

  Ok, the idea is to create a file queue that can be modified and reorganized (this is done) and for each file execute a ffmpeg process to convert it to another format.

  For conversion use Xabe.FFmpeg and .Net 4.5 all using async and await.

  The question would be how to execute an x ​​number of processes in parallel (example 4) of that variable queue and when one of them finishes executing the next one, keeping in execution always the same amount in parallel. I can start from scratch but I need ideas on how to do this in the simplest way possible. The program itself is simple (with gui) takes a folder and its subfolders all the video files and queues them and starts the conversion, you can add other folders with more files, and independent files reorder them, to convert whichever is the greater.

  At one point I found a package I think nuget (or github) that did exactly what I needed but I have not been able to get back.

  Thanks for your help in advance.

  Excuse the English because I use the translator of Google for being faster because my domain of this is limited but sufficient to understand the answers.

  ---

  Ok, I found what I was looking for called ProcessManager is a nupkg package. It has 2 years of development but seems stable. The only drawback is that it does not allow me to organize the conversion queue once you have added the files, although I have to try some ideas that maybe functions.

  var manager = new Manager(4); // Max 4 processes will be started simultaneously
  
  manager.Start();
  
  
  
  manager.ProcessErrorDataReceived += (sender, e) => Console.WriteLine(e.Data);
  
  manager.ProcessOutputDataReceived += (sender, e) => Console.WriteLine(e.Data);
  
  
  
  foreach (var videoFileName in Directory.EnumerateFiles("videos"))
  
  {
  
      var info = new ProcessInfo(
  
          "ffprobe.exe",
  
          string.Format("-v quiet -print_format json -show_format -show_streams \"{0}\"", videoFileName));
  
  
  
      manager.Queue(info);
  
  }

  Process Manager

• Playing back video one frame at a time and saving a bitmap on android

  7 septembre 2017, par Timmoth

  I’m trying to achieve frame by frame playback of mp4 videos on Android with the ability of capturing and saving a chosen frame to an external storage device.

  I have used VideoView and MediaController to playback a video and MediaMetadataRetriever to retrieve and save a frame as a bitmap however this solution does not give me the ability to step through the video one frame at a time nor does it allow me the accuracy i need of capturing a specific frame.

  I have been reading up on how to cross compile FFMPEG for android and write a wrapper to give me a much larger range of video capabilities as i believe this is a viable route to go down. Unfortunately there is not much information out there on getting FFMPEG working on Android, and i couldn’t find anything helpful from the last few years.

  My questions are
  1) Am i missing something and does the android framework give this granular control over video playback ?

  2) Is it possible to use FFMPEG to playback a video frame by frame in a android application ?

  3) Does anyone have any resource on compiling and using a recent version of FFMPEG on android 7 ?

• lavd : drop QTKit indev

  4 septembre 2017, par Clément Bœsch

  lavd : drop QTKit indev
  QTKit has been deprecated in favor of AVFoundation for years, and we
  
  have an avfoundation input device.
  See https://developer.apple.com/documentation/qtkit
  

  • [DH] Changelog
  • [DH] MAINTAINERS
  • [DH] configure
  • [DH] doc/indevs.texi
  • [DH] libavdevice/Makefile
  • [DH] libavdevice/alldevices.c
  • [DH] libavdevice/qtkit.m