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• ffmpeg add all audio tracks to video conversion (mkv)

  7 mars 2016, par blast1987

  I have a script that takes in input a video file (generally avi or mp4) and converts it to a "lower quality" mkv video optimized for web streaming.

  The ffmpeg command I use is this one :

  ffmpeg -fflags +genpts -i file:"$input" -sn -codec:v:0 libx264 -force_key_frames expr:gte\(t,n_forced*5\) -vf "scale=trunc(min(max(iw\,ih*dar)\,1280)/2)*2:trunc(ow/dar/2)*2" -pix_fmt yuv420p -preset superfast -crf 23 -b:v 1680000 -maxrate 1680000 -bufsize 3360000 -vsync vfr -profile:v high -level 41 -map_metadata -1 -threads 8 -codec:a:0  libmp3lame -ac 2 -ab 320000 -af "aresample=async=1" -y "$output"

  The problem is that this command only includes the first audio track of my video. I have some dual language videos (italian and english) for which I want to include both languages.

  Is there a simple ffmpeg command option that automatically includes all audio tracks found in a video ?

• How create video from image and sound (ffmpeg)

  29 novembre 2019, par sibbasa

  I need to make a video out of images and music. I use this code :

  Process process = new Process();
  
  ProcessStartInfo start = new ProcessStartInfo();
  
  start.FileName = @"d:\test\ffmpeg.exe";
  
  string argumets = String.Format("-r 6/1 -i d:\\test\\img\\img%d.jpg -i 
  
  d:\\test\\outfiles\\29112019111455.wav -c:v libx264 -c:a aac -b:a 192k -pix_fmt yuv420p -shortest 
  
  d:\\test\\outfiles\\out.mp4");
  
  Console.WriteLine(argumets);
  
  start.Arguments = argumets;
  
  start.WindowStyle = ProcessWindowStyle.Minimized;
  
  process = Process.Start(start);
  
  process.WaitForExit();
  
  process.Refresh();

  But the video is longer than the audio track.
  If the audio track is 60 seconds and there are 6 images, then each image should last 10 seconds.

  Sorry for my English.

• How can I encode a video in a MP4 container using OpenCV 2.4.10 ? (Win 8.1)

  24 juin 2015, par Angie Quijano

  I have been trying to encode a vector that contains images, in a MP4 video. I have tried to use a lot of FOURCC codecs for this purpose, but I have not been successful.
  I have achieved to encode my vector in a AVI video using as CV_FOURCC code this : CV_FOURCC(’X’,’V’,’I’,’D’), but I really need to obtain a MP4 video. I have tried the following FOURCC codes : MP4S, MP4V, XVID, DVIX, X264, H264, FMP4, and others than I can’t remember.

  My line of code is :

  VideoWriter(videoName, CV_FOURCC('X','2','6','4'), fps, outputSize)
  
  where videoName = "OutputVideo.mp4", fps = 47, outputSize = [4225x2030].

  I checked if I built my OpenCV with Ffmpeg support and I got this :

   Video I/O:
  
     Video for Windows:           YES
  
     DC1394 1.x:                  NO
  
     DC1394 2.x:                  NO
  
     FFMPEG:                      YES (prebuilt binaries)
  
       codec:                     YES (ver 55.18.102)
  
       format:                    YES (ver 55.12.100)
  
       util:                      YES (ver 52.38.100)
  
       swscale:                   YES (ver 2.3.100)
  
       gentoo-style:              YES
  
     OpenNI:                      NO
  
     OpenNI PrimeSensor Modules:  NO
  
     PvAPI:                       NO
  
     GigEVisionSDK:               NO
  
     DirectShow:                  YES
  
     Media Foundation:            NO
  
     XIMEA:                       NO
  
     Intel PerC:                  NO

  I don’t know what I’m doing wrong. Can anyone help me, please ?

  Sorry for my english.