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• ffmpeg : Concat multiple mp4 with no audible delay between clips

  16 novembre 2014, par Geuis

  I have several dozen mp4 clips that all have the same resolution, codecs, etc. I’m trying to combine them into a single file using ffmpeg, but there always seems to be a slight audio delay between the clips. My problem is that I’d like them to be seamless.

  Been following the steps here, https://trac.ffmpeg.org/wiki/How%20to%20concatenate%20(join,%20merge)%20media%20files

  There’s always a slight delay between the files, which is especially noticeable in the audio.

  Is there a recommended way to merge video files with no delay between them ?

• FFMPEG image resize not working

  8 décembre 2015, par Soundhar Raj

  FFmpeg version 0.6.5 is installed on my web server.

  In my website mp4 videos allowed to upload, that part is done.
  Now i am working on create a thumbnail of the video and then resize it.

  The following links are I referred.

  https://trac.ffmpeg.org/wiki/Create%20a%20thumbnail%20image%20every%20X%20seconds%20of%20the%20video

  https://trac.ffmpeg.org/wiki/Scaling%20(resizing)%20with%20ffmpeg

  This is the command i used to create a thumbnail from video, this command is working.

  $cmd = "ffmpeg -i test.mp4 -ss 0 -vframes 1 out.png";

  After creating the thumbnail, I tried the following the command to resize it, but this is not working.

  $cmd = 'ffmpeg -i out.png -vf scale=210:-1 output_320x240.png';

  And Some other commands i have tried

  $cmd = "ffmpeg -ss 10 -i test.mp4 -vframes 1 -filter scale=-1:150,crop=200:150 output.jpg";
  
  
  
  $cmd = "ffmpeg -itsoffset -1 -i test.mp4 -vframes 1 -filter:v scale=280:-1 output.jpg";

  In my localhost I used the following command to create thumbnail and resize in a single command, but this is also not working in the server.

  $ffmpeg = 'C:\\ffmpeg\\bin\\ffmpeg';
  
  $video = 'test.mp4';
  
  $cmd = "$ffmpeg -itsoffset -1 -i $video -vframes 1 -filter:v scale=\"210:-1\"  thumbnail.png";

  Thanks to all

• Ffmpeg for Windowsphone 8

  11 mai 2015, par prakash

  I came across this urls
  1.https://github.com/pinger-inc/FFMPEG_WindowsPhone
  2.https://trac.ffmpeg.org/wiki/CompilationGuide/WinRT

  I am trying to compile ffmpeg for windows phone 8. I able to compile successfully but I am missing the ffmpeg.lib file after compilation. I am trying to compile this because of the windows phone certification issue we faced while submitting to the store.

  "The native API api-ms-win-core-processthreads-l1-1-1.dll:GetProcessTimes() isn’t allowed in assembly FFMPEGRuntime.dll. Update it and then try again."