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• Stacking videos with ffmpeg via MATLAB not working as expected

  18 juillet 2022, par ersatzsheep

  I am stacking 4 video inputs in a 2x2 grid and running into a conversion failure.

  


  Basically, at least one of the videos is just a filler black video that I generated with this line (MATLAB, hence the eval) :

  


  eval(['!ffmpeg -framerate 1/3600 -i black_frame.JPG -c:v libx264 -t 3600 -pix_fmt yuv420p -vf scale=320:240 black_frame.mp4']);


  


  The other video inputs are 4 hr long videos with identical specs. I've concatenated them with this line :

  


  eval(['!ffmpeg -i "' v1 '" -i "' v3 '" -i "' v2 '" -i "' v4 '" -filter_complex "  [0:v] setpts=PTS-STARTPTS, scale=qvga [a0]; [1:v] setpts=PTS-STARTPTS, scale=qvga [a1]; [2:v] setpts=PTS-STARTPTS, scale=qvga [a2];  [3:v] setpts=PTS-STARTPTS, scale=qvga [a3];  [a0][a1][a2][a3]xstack=inputs=4:layout=0_0|0_h0|w0_0|w0_h0[out] "  -map "[out]" -c:v libx264 "' output '"'])  


  


  When I input v1-v4 with normal videos (not the filler black video), it outputs very quickly and everything is good. The line to generate the filler black video is very fast too. But when I sub one of the video inputs with the file path for the filler black video, the speed tanks exponentially, stalls, and conversion fails.

  


  Any pointers for me ? I also tried just subbing one of the inputs with a black image file instead of generating a whole video and inputting that. But it does the same thing :/ Does it have to do with frame rate ? Should I try a different approach ? Thanks.

  


• ffmpeg - less frames getting extracted than expected

  20 juin 2021, par Vrajesh Doshi

  


  ffmpeg -i instagram.mp4 -vf fps=29.97 thumb%06d.jpg -hide_banner

  
 


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'instagram.mp4' : Metadata :
 major_brand : isom
 minor_version : 512
 compatible_brands : isomiso2avc1mp41
 encoder : Lavf55.19.104 Duration : 00:00:13.61, start : 0.000000, bitrate : 1163 kb/s
 Stream #0:0(und) : Video : h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x640 [SAR 1:1 DAR 1:1], 1099 kb/s, 29.97 fps,
 29.97 tbr, 11988 tbn, 59.94 tbc (default)
 Metadata :
 handler_name : VideoHandler
 Stream #0:1(und) : Audio : aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 64 kb/s (default)
 Metadata :
 handler_name : SoundHandler Stream mapping : Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native)) Press [q] to stop, [?] for help [swscaler @ 0x55b2b53cf440] deprecated pixel format used, make sure
 you did set range correctly Output #0, image2, to 'thumb%06d.jpg' :
  
 Metadata :
 major_brand : isom
 minor_version : 512
 compatible_brands : isomiso2avc1mp41
 encoder : Lavf57.83.100
 Stream #0:0(und) : Video : mjpeg, yuvj420p(pc), 640x640 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc (default)
 Metadata :
 handler_name : VideoHandler
 encoder : Lavc57.107.100 mjpeg
 Side data :
 cpb : bitrate max/min/avg : 0/0/200000 buffer size : 0 vbv_delay : -1 frame= 405 fps=231 q=24.8 Lsize=N/A time=00:00:13.51 bitrate=N/A speed=7.72x video:5961kB audio:0kB subtitle:0kB other streams:0kB
 global headers:0kB muxing overhead : unknown

  


  



  The video duration is 13.61 seconds and frame rate is 29.97. So I was expecting 13.61 * 29.97 = 407.8917 i.e. 407 frames. But have got 405 frames. I am new to ffmpeg, need help to correctly get all 407 frames.

  



  I had also tried following command,

  



  ffmpeg -i instagram.mp4 thumb%06d.jpg -hide_banner


  



  but the output was same 405 frames.

  



  Possibly the start 2 frames are missing.

  



  I need to display the frames generated in the base video timeline. And on clicking on the frame I need to exactly seek the video to the frame position using HTML5 currentTime. Since the first 2 frames are not getting available, exact mapping is not getting possible.

  



  Please guide.

  


• PHP-FFMpeg Installation and Basic Usage on windows issue

  7 mai 2017, par Miky

  following the README I installed PHP FFmpeg through Composer and I downloaded binaries from https://ffmpeg.zeranoe.com/builds/
  now I’m trying to run the "Basic Usage" example :
  

  <?php
  
  require("vendor/autoload.php");
  
  $ffmpeg = FFMpeg\FFMpeg::create();
  
  $video = $ffmpeg->open('video.mpg');
  
  $video
  
      ->filters()
  
      ->resize(new FFMpeg\Coordinate\Dimension(320, 240))
  
      ->synchronize();
  
  $video
  
      ->frame(FFMpeg\Coordinate\TimeCode::fromSeconds(10))
  
      ->save('frame.jpg');
  
  $video
  
      ->save(new FFMpeg\Format\Video\X264(), 'export-x264.mp4')
  
      ->save(new FFMpeg\Format\Video\WMV(), 'export-wmv.wmv')
  
      ->save(new FFMpeg\Format\Video\WebM(), 'export-webm.webm');
  
  ?>

  but i receive "Executable not found" errors because I didn’t understand where to put them
  

  I also tried specifying binaries ffmpeg.exe and ffprobe.exe with :
  

  $ffmpeg = FFMpeg\FFMpeg::create(array(
  
      'ffmpeg.binaries'  => '/pathtobin/ffmpeg',
  
      'ffprobe.binaries' => '/pathtobin/ffprobe',
  
      'timeout'          => 3600, // The timeout for the underlying process
  
      'ffmpeg.threads'   => 12   // The number of threads that FFMpeg should use
  
  ), $logger);

  but still same error... am I making a mountain out of a molehill ? any help is appreciated... Thanks

  EDIT 1

  I added ffmpeg\bin folder to system path and I can run executables from cmd from anywhere, but now I’m getting this error : "Executable not found, proposed : avprobe, ffprobe"...
  instead, if I give binary paths explicitly, I get 'ffprobe failed to execute command "C:/FFmpeg/bin/ffprobe.exe" "-help" "-loglevel" "quiet"'

  what am I doing wrong ?

  EDIT 2

  web server config

  • Windows 10 Pro
    
  • IIS 10
    
  • PHP 7.0.9
    

  site root ---> C:\inetpub\wwwroot\site\
  content :
  
   index.php
  
   input.mp4
  
   vendor/ (PHP-FFMpeg library folder)
  

  FFmpeg binaries ---> C:\inetpub\wwwroot\FFmpeg\
  content :
  
   ffmpeg.exe
  
   ffplay.exe
  
   ffprobe.exe
  

  index.php

  <?php
  
  ini_set('display_errors', 'On'); error_reporting(E_ALL);
  
  require("vendor/autoload.php");
  
  $ffmpeg = FFMpeg\FFMpeg::create(array(
  
      'ffmpeg.binaries'  => 'C:/inetpub/wwwroot/FFmpeg/ffmpeg.exe',
  
      'ffprobe.binaries' => 'C:/inetpub/wwwroot/FFmpeg/ffprobe.exe',
  
      'timeout'          => 3600, // The timeout for the underlying process
  
      'ffmpeg.threads'   => 12,   // The number of threads that FFMpeg should use
  
  ));
  
  $video = $ffmpeg->open('input.mp4');
  
  ?>

  result

  Fatal error: Uncaught Alchemy\BinaryDriver\Exception\ExecutionFailureException: ffprobe failed to execute command "C:/inetpub/wwwroot/FFmpeg/ffprobe.exe" "-help" "-loglevel" "quiet" in C:\inetpub\wwwroot\site\vendor\alchemy\binary-driver\src\Alchemy\BinaryDriver\ProcessRunner.php:100 Stack trace: #0 C:\inetpub\wwwroot\site\vendor\alchemy\binary-driver\src\Alchemy\BinaryDriver\ProcessRunner.php(72): Alchemy\BinaryDriver\ProcessRunner->doExecutionFailure('"C:/inetpub/www...') #1 C:\inetpub\wwwroot\site\vendor\alchemy\binary-driver\src\Alchemy\BinaryDriver\AbstractBinary.php(209): Alchemy\BinaryDriver\ProcessRunner->run(Object(Symfony\Component\Process\Process), Object(SplObjectStorage), false) #2 C:\inetpub\wwwroot\site\vendor\alchemy\binary-driver\src\Alchemy\BinaryDriver\AbstractBinary.php(137): Alchemy\BinaryDriver\AbstractBinary->run(Object(Symfony\Component\Process\Process), false, NULL) #3 C:\inetpub\wwwroot\site\vendor\php-ffmpeg\php-ffmpeg\src\FFMpeg\FFProbe\OptionsTester.php(61): Alchemy\Binary in C:\inetpub\wwwroot\site\vendor\php-ffmpeg\php-ffmpeg\src\FFMpeg\FFProbe\OptionsTester.php on line 63