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• ffmpeg merge 2 videos missing audio

  30 janvier 2016, par Liao

  I followed the wiki

  $ffmpeg_bin -i part1_1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
  $ffmpeg_bin -i part1_2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
  $ffmpeg_bin -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc result.mp4

  the origin part1_1.mp4 has no audio, part1_2.mp4 does

  But the result.mp4 has no audio.

  When I change part1_1.mp4 to a video which has audio, then result.mp4 got audio

  Why ?

• ffmpeg not creating video from images

  16 décembre 2014, par Knight Rider

  I have read this Create Video using ffmpeg

  Stack Question for the Same

  Wiki Page for the same

  Still I am not able to get it.
  I have written this shell command in PHP

  echo $make_movie = "$ffmpeg -framerate 1/5 -i $folder_name/img%03d.png -c:v libx264 -r 25 -pix_fmt yuv420p $folder_name/output.mp4";

  This gives output

  ffmpeg\bin\ffmpeg.exe -framerate 1/5 -i ankit/img%03d.png -c:v libx264 -r 25 -pix_fmt yuv420p ankit/output.mp4
  
  
  
  if(shell_exec($make_movie)){
  
      echo "<br />Movie Created..<br />";
  
  }
  
  else{
  
      echo "<br />Movie Creation Error..<br />";
  
  }

  The Output is Movie Creation Error that means the Shell Command is not executing ?

  Questions :

  1. What is wrong ?
  2. For future use, any debugging methods for this ?

  I ran the same command on cmd and it made the video..!!!

• How to stream video using C/C++

  19 janvier 2015, par Arif Ali Saiyed

  I want to stream video to a file/ or memory buffer using VC++ on windows.
  Can anyone suggest easy to integrate library ?(that has one H,one LIB and one DLL).

  I am exploring the libVLC right now and gonna explore FFMPEG also.
  dont want to spend time in building these complex software fully myself, would appreciate any help/pointer/ references.

  ---

  My ultimate goal is to stream a video and consume the stream on HTML5 viewer.
  I tried streaming using VLC media player and streamed to a OGG file, I used same OGG file in a HTML5-Video tag and it worked.

  Now I want to do the streaming part using libVLC instead of VLC media player.
  I want to stream the video file to File or memory stream.

  I have found this sample https://wiki.videolan.org/Stream_to_memory_(smem)_tutorial/

  BUt unsure of how to get started ?
  1) Where do i get the libVLC.dll, libVLC.lib, libVLC.h , Is there any sample visual studio that has everything setup and I can straight begin to write the code using libVLC etc.

  2) Since libVLC is said to depdend on 200+ other libraries/modules/plugins, what will I have include and distribute with my application ?
  http://www.enjoythearchitecture.com/vlc-architecture.html
  https://wiki.videolan.org/Contrib_Status/

  3) streaming format : above example seems to stream into PCM format, cant I get it stream in some format that has better codec and regonized by HTML5 ? For example when i tried using VLC media player , my options were as following
  :sout=#transcodevcodec=theo,vb=800,acodec=vorb,ab=128,channels=2,samplerate=44100:filedst=C :\Users\testUser\stream-output.ogg,no-overwrite :sout-keep