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• Error decoding timecode using ffprobe

  16 novembre 2016, par Pablo Montilla

  I’m using ffprobe to get timecode from an mxf which has DF timecode but with a non DF frame rate. I’m getting the error Drop frame is only allowed with 30000/1001 or 60000/1001 FPS.

  I’m running ffprobe -i "IMX 10Bit.mxf" and getting the following :

    ffprobe version 3.2 Copyright (c) 2007-2016 the FFmpeg developers
  
      built with gcc 5.4.0 (GCC)
  
      configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
      libavutil      55. 34.100 / 55. 34.100
  
      libavcodec     57. 64.100 / 57. 64.100
  
      libavformat    57. 56.100 / 57. 56.100
  
      libavdevice    57.  1.100 / 57.  1.100
  
      libavfilter     6. 65.100 /  6. 65.100
  
      libswscale      4.  2.100 /  4.  2.100
  
      libswresample   2.  3.100 /  2.  3.100
  
      libpostproc    54.  1.100 / 54.  1.100
  
    [mxf @ 00000000025a3660] Drop frame is only allowed with 30000/1001 or 60000/1001 FPS
  
    Input #0, mxf, from 'IMX 10Bit.mxf':
  
      Metadata:
  
        uid             : 2b3801ea-ec5e-4dc1-ab3a-dba9a2b30ce4
  
        generation_uid  : 2b3801ea-ec5e-4dc2-ab3a-dba9a2b30ce4
  
        product_uid     : 00000000-0000-0000-0000-000000000000
  
        modification_date: 2009-11-04T10:39:42.000000Z
  
        material_package_umid: 0x060A2B340101010501010D43130000005C91020063D700800210F3FFFE154618
  
      Duration: 00:00:19.52, start: 0.000000, bitrate: 62580 kb/s
  
        Stream #0:0: Video: mpeg2video (4:2:2), yuv422p(tv, top first), 720x608 [SAR 152:135 DAR 4:3], 50000 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
        Metadata:
  
          file_package_umid: 0x060A2B340101010501010D43130000005D91020063D700800210F3FFFE154618
  
        Stream #0:1: Audio: pcm_s24le, 48000 Hz, 4 channels, s32 (24 bit), 4608 kb/s
  
        Metadata:
  
          file_package_umid: 0x060A2B340101010501010D43130000005D91020063D700800210F3FFFE154618

• How to compile ffmpeg-0.10.3 on windows with cygwin and android ndk r5

  19 avril 2014, par Vikram Mahal

  I want to compile ffmpeg on windows with cygwin and android ndk.
  I found this link very useful because there is step to step guide to compile ffmpeg.

  Does anyone find this useful ? - Compiling FFMPEG on Windows with Cywin and NDK r5

  But at last point when i am going to create .so file i got this error in cygwin bash.

  ---

  CONSOLE OUTPUT :

  vikram mahal@vikrammahal-PC ~
  
  $ cd /cygdrive/c/ffmpeg-0.10.3
  
  vikram mahal@vikrammahal-PC /cygdrive/c/ffmpeg-0.10.3
  
  $ dos2unix build_android.sh
  
  dos2unix: converting file build_android.sh to Unix format ...
  
  vikram mahal@vikrammahal-PC /cygdrive/c/ffmpeg-0.10.3
  
  $ ./build_android.sh
  
  )/configure: line 10: warning: setlocale: LC_ALL: cannot change locale (C
  
  ': not a valid identifierort: `LC_ALL
  
  ./configure: line 14: syntax error near unexpected token `$'{\r''
  
  '/configure: line 14: `try_exec(){
  
  ./build_android.sh: line 54: make: command not found
  
  ./build_android.sh: line 55: make: command not found
  
  C:\android-ndk-r5\toolchains\arm-linux-androideabi-4.4.3\prebuilt\windows\bin\ar
  
  m-linux-androideabi-ld.exe: cannot open output file ./android/armv7-a/libffmpeg.
  
  so: No such file or directory

• ffmpeg command executes via command line, but not via PHP script

  20 juin 2021, par Mihail Minkov

  I am working on a simple video upload and compression system and I am currently using the following process.

  



  First Step

  



  I use a multipart/form-data to upload the original video file, which I store in /var/www/site/videos_pre/video.mp4. My public folder is var/www/site/public_html/. I store an entry in my database with the video information.

  



  Second step

  



  I have a converter process which is very basic, but does the job (at least in CLI).

  



  It has the following code :

  



  public function converter($content_id)
{
    $content = $this->videos_m->get($content_id);

    $id = uniqid();
    $name_mp4 = $content->name_slug.'_'.$id.'.mp4';
    $name_webm = $content->name_slug.'_'.$id.'.webm';

    $command_mp4 = 'ffmpeg -i ../videos_pre/'.$content->original_file.' -b:v 1500k -bufsize 1500k ./videos/'.$name_mp4;
    system($command_mp4);

    $command_webm = 'ffmpeg -i ./videos/'.$name_mp4.' -c:v vp9 -c:a libvorbis ./videos/'.$name_webm;
    system($command_webm);

    $update_video = new stdClass();
    $update_video->archivo_mp4 = $name_mp4;
    $update_video->archivo_webm = $name_webm;

    $this->db->where('content_id', $content_id);
    $this->db->update('Videos', $update_video);
}


  



  Third step - where the problem occurs

  



  I have tested this on Windows 10 and Ubuntu 18.04. The code works on Windows 10 in both php and cli. The code on Ubuntu only works with cli.

  



  The resulting commands are something like this :

  



  // First command to reduce the bitrate of the mp4
ffmpeg -i /var/www/site/videos_pre/video.mp4 -b:v 1500k -bufsize 1500k /var/www/site/public_html/videos/video_5e757d3e0d762.mp4

// Second command to convert the mp4 to a webm to get both types
ffmpeg -i /var/www/site/public_html/videos/video_5e757d3e0d762.mp4 -c:v vp9 -c:a libvorbis /var/www/site/public_html/videos/video_5e757d3e0d762.webm


  



  If I execute those commands they work perfectly. If I run the php script, be it in the browser or via CLI, literally nothing happens. No error messages nothing.

  



  I am not sure if it's a permission issue, if there's something specific for php to run this, or some module I've not activated. I have enough execution time, I have it at 600 seconds, but as I said it doesn't even take time, it just does nothing.

  



  I can even echo the commands and they appear. So, basically the problem is I need to be able to run those commands from PHP. I did it on Windows, but Ubuntu 18.04 won't let me. Both OSs have ffmpeg recently installed and I've been able to convert on both of them.

  



  I tried changing paths from absolute to relative, no difference at all.