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• Call ffmpeg in c++ with system() function fails

  2 septembre 2014, par zhen lee

  I write a c++ program which needs to convert some(say:10) mp4 videos to flv videos.
  I use ffmpeg in my program for each video like this :

  system("ffmpeg -i video -filter:v yadif -ar 44100 -sameq -y -f flv temp.flv")

  however,it turns out :only first video will be converted successfully,the others will fail.
  it means :
  when i change the input order of which video to convert and re-execution the program,it behave the same:only the first video(will be different each time as i changed the input video order) will be converted successfully.

  The error message like :

  [h264 @ 0xaee0740] concealing 45 DC, 45 AC, 45 MV errors
  [h264 @ 0xaee0ce0] AVC : nal size 305665
  Last message repeated 1 times
  [h264 @ 0xaee0ce0] no frame !
  [h264 @ 0xaee1280] AVC : nal size 572993
  Last message repeated 1 times
  [h264 @ 0xaee1280] no frame !
  [aac @ 0xad9ccc0] channel element 0.13 is not allocated
  Error while decoding stream #0:1
  [aac @ 0xad9ccc0] channel element 0.13 is not allocated
  Error while decoding stream #0:1
  [aac @ 0xad9ccc0] channel element 0.13 is not allocated
  Error while decoding stream #0:1
  ......
  The most strange thing is :when i run ffmpeg command in bash shell,all video will be converted successfully .

  After google it,I have try these(certainly failed) :

  1. remove -sameq option,the result is same ;

  2. write ffmpeg commod in a shell script ConvertToFlv.sh like :

     /usr/local/bin/ffmpeg -i "$dir/$1" -filter:v yadif -ar 44100 -sameq -y -f flv "$dir/temp.fiv"

     then call this script in program like

     system("ConvertToFlv.sh"+video)

     or

     system("sh ConvertToFlv.sh"+video)

     The result is same.

  The ffmpeg configure is :

    ffmpeg version 0.9.1.git Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Dec 17 2012 16:17:30 with gcc 4.1.2 20080704 (Red Hat 4.1.2-48)
  
    configuration: --enable-gpl --enable-postproc --enable-nonfree --enable-postproc --enable-swscale --enable-avfilter --enable-pthreads --enable-libxvid --enable-libx264 --enable-libmp3lame --enable-libfaac --disable-ffserver --disable-ffplay
  
    libavutil      51. 41.100 / 51. 41.100
  
    libavcodec     54.  4.100 / 54.  4.100
  
    libavformat    54.  1.100 / 54.  1.100
  
    libavdevice    53.  4.100 / 53.  4.100
  
    libavfilter     2. 62.101 /  2. 62.101
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0.  7.100 /  0.  7.100
  
    libpostproc    52.  0.100 / 52.  0.100

  and my machine envirment is :

  Linux master 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:14 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

  I’m irritable now,I hope someone can give me some advice,really appreciate it.

• How to overlay a logo on a video every 60 seconds using ffmpeg ?

  17 juin 2024, par Wolf Wolf

  I am trying to overlay a logo on a video every 60 seconds for a duration of 5 seconds using ffmpeg. Here's the command I am using :

  


  ffmpeg -i input.mp4 -i logo.png -filter_complex "[0:v]setpts=PTS-STARTPTS[v0];[1:v]loop=-1:size=1:start=0,setpts=N/(FRAME_RATE*TB)[logo];[v0][logo]overlay=enable='mod(t,60)<5':x=W-w-10:y=H-h-10[out]" -map "[out]" -map 0:a -c:a copy output.mp4


  


  However, I am encountering the following error :

  


  

[overlay @ 000002199e0b3f00] [Eval @ 000000f94f9feff0] Invalid chars '<5' at the end of expression 'mod(t,60)<5'

[overlay @ 000002199e0b3f00] Error when evaluating the expression 'mod(t,60)<5' for enable

[AVFilterGraph @ 000002199e098b00] Error initializing filters

Failed to set value '[0:v]setpts=PTS-STARTPTS[v0];[1:v]loop=-1:size=1:start=0,setpts=N/(FRAME_RATE*TB)[logo];[v0][logo]overlay=enable='mod(t,60)<5':x=W-w-10:y=H-h-10[out]' for option 'filter_complex': Invalid argument

Error parsing global options: Invalid argument

I am using ffmpeg version X.XX on [your OS here, e.g., Windows 10].



  


  I want the logo to appear every 60 seconds for 5 seconds at the bottom-right corner of the video.

  


  The input video and logo files are valid and can be processed with simpler ffmpeg commands.

  


  How can I correctly format the ffmpeg command to overlay the logo every 60 seconds without encountering the invalid argument error ?

  


• Anomalie #3779 : Erreur ""Un dossier temporaire est manquant pour télécharger les fichiers"

  7 mai 2016, par Franck Dalot

  Buenos dias, :-)
  necesito mas informaciones para tratar de reproducir el problema
  version de PHP ?
  Version de spip 3.1.x ; 3.0.x ; 2.1.x ?
  Se trata de una version NATIVA o de un sitio que ,por ejemplo paso de una version 3.0.x a una version 3.10x ?
  tipo del’magen ?jpeg ?gif ?...