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• Compile FFMPEG for iOS development

  7 avril 2016, par Alec Gamble

  So I’ve been googling around and there seem to be a lot of answers to this questions... for people who know what they’re doing. Unfortunately I am not one of these people. I had a version of FFMPEG I was using in a project and now I want to port that project to iOS. So I have a version of FFMPEG with LAME installed on my desktop and in my C++ application I was just accessing this through the command line via the system() method. I also just downloaded the FFMPEG iOS build from here :

  https://github.com/kewlbear/FFmpeg-iOS-build-script

  and the gas-preprocessor from the link on that page but I’m unsure as to what to do with it now and how to get it to a state where I would be able to compile a basic FFMPEG test to my iPhone.

  ---

  I tried adding the libraries as mentioned in :
  How to Build FFMpeg as iOS Framework so my project hierarchy looks like :

  

  but when I do :

  #import <libavcodec></libavcodec>avcodec.h> as suggested

  or any other import I can think to do it always errors me out saying it can’t find it. I’m not sure if this is because I’m not using search paths correctly or my import line is wrong or what...

• Merge remote-tracking branch ’cehoyos/master’

  25 juillet 2013, par Michael Niedermayer

  Merge remote-tracking branch ’cehoyos/master’
  * cehoyos/master :
  
    Show max bitrate for mpeg2 video streams in avcodec_string().
  
    Allow native compilation on the iPhone.
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] configure
  • [DH] libavcodec/utils.c

• ffmpeg-Error "Buffer queue overflow, dropping." when merging two videos with delay

  20 septembre 2016, par Stefan Urbansky

  I want to merge two videos (as example the iphone video from https://peach.blender.org/trailer-page/). The videos are placed on an background image with the overlay filter and the second video starts 3 seconds later.

  And I need that the audio is mixed.

  Here is my code :

  ffmpeg \
  
      -loop 1 -i background.png  \
  
      -itsoffset 0  -i trailer_iphone.m4v \
  
      -itsoffset 3  -i trailer_iphone.m4v \
  
      \
  
      -y \
  
      -t 36 \
  
      -filter_complex "
  
          [2:a] adelay=3000 [2delayed];
  
          [1:a][2delayed] amerge=inputs=2 [audio];
  
          [0][1:v] overlay=10:10:enable='between(t,0,33)' [lv1];
  
          [lv1][2:v] overlay=10:300:enable='between(t,0,36)' [video]
  
      " \
  
      \
  
      -threads 0 \
  
      -map "[video]" -map "[audio]" \
  
      -vcodec libx264 -acodec aac \
  
      merged-video.mp4

  I get the error message :

  [Parsed_overlay_3 @ 0x7fe892502ac0] [framesync @ 0x7fe892502b88] Buffer queue overflow, dropping.

  And the merged video has many dropped frames.

  I know that are some other posting with this error message. But the suggested solutions doesn’t work for me.

  How can I fix the problem ?