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• ffprobe json output not working in exec, but works in CMD

  26 novembre 2015, par Nicholas Walker

  I’ve installed ffmpeg on my windows 2008 server.

  I use this string in CMD and i get what i want to get in my

  PHP file :

   ffprobe -v quiet -print_format json -show_format -show_streams "C:\wamp\www\uploads\fc30e528b500b26a391ed4f5ed484310.mp4" 

  This is my PHP function i found on another stackoverflow question, it had great feedback so i tested it.

  $file_name = 'fc30e528b500b26a391ed4f5ed484310';
  
  $file_ext = 'mp4';
  
  $ffprobe = 'C:\\ffmpeg\\bin\\ffprobe.exe';
  
  $videoFile = 'C:\\wamp\\www\\uploads\\'.$file_name.'.'.$file_ext;
  
  
  
  $cmd = shell_exec($ffprobe .' ffprobe -v quiet -print_format json -show_format -show_streams "'.$videoFile.'"');
  
  $parsed = json_decode($cmd, true);
  
  print_r($parsed);

  What is get back is nothing. I also tried using the same function i used with ffmpeg(which i got working for ffmpeg).

  $cmd = $ffprobe.' ffprobe -v quiet -print_format json -show_format -show_streams "'.$videoFile.'" 2>&1';
  
  echo shell_exec($cmd);

  This also brings back nothing.

  Any ideas ?

• OpenCv and ffmpeg working toghether on iOS

  1er avril 2014, par jjca

  I'm developing an iOS app which captures frames from camera with openCV, following this tutorial, and encodes those frames into a video using ffmpeg.

  The capture works fine, the problem comes with the ffmpeg part. I'm getting the following linker error when i try to use anything of ffmpeg :

  Undefined symbols for architecture armv7 :
  "avcodec_find_encoder(AVCodecID)", referenced from :
  -[ViewController processImage :] in ViewController.o
  ld : symbol(s) not found for architecture armv7
  clang : error : linker command failed with exit code 1 (use -v to see invocation)

  It only happens when the class file is named *.mm but not using ffmpeg in pure objective-c code.

  I'm using the binaries provided by openCV and compiling the ffmpeg ones by myself.

  Would compile them together fix the problem ? is possible to this ?

• ffmpeg not working with filenames that have whitespace

  1er avril 2017, par cmw

  I’m using FFMPEG to measure the duration of videos stored in an Amazon S3 Bucket.

  I’ve read the FFMPEG docs, and they explicitly state that all whitespace and special characters need to be escaped, in order for FFMPEG to handle them properly :

  See docs 2.1 and 2.1.1 : https://ffmpeg.org/ffmpeg-utils.html

  However, when dealing with files whose filenames contain whitespace, ffmpeg fails to render a result.

  I’ve tried the following, with no success

  ffmpeg -i "http://s3.mybucketname.com/videos/my\ video\ file.mov" 2>&1 | grep Duration | awk '{print $2}' | tr -d
  
  ffmpeg -i "http://s3.mybucketname.com/videos/my video file.mov" 2>&1 | grep Duration | awk '{print $2}' | tr -d
  
  ffmpeg -i "http://s3.mybucketname.com/videos/my'\' video'\' file.mov" 2>&1 | grep Duration | awk '{print $2}' | tr -d
  
  ffmpeg -i "http://s3.mybucketname.com/videos/my\ video\ file.mov" 2>&1 | grep Duration | awk '{print $2}' | tr -d

  However, if I strip out the whitespace in the filename – all is well, and the duration of the video is returned.

  Any help is appreciated !