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• Capturing terminal output into pandas dataframe without creating external text file

  4 septembre 2024, par tavalendo

  I am using ffmpeg's extract_mvs file to generate some text information. I would use a command like this in the terminal :

  



  /extract_mvs input.mp4 > output.txt


  



  I would like to use this command with Popen or other subprocess in python such that instead of output.txt, the data is passed straight to a pandas data frame without actually generating the text file.

  



  The idea is to automate this multiple times, so, I am trying to avoid many .txt files from being generated and thus having to open() them one by one.

  



  I thought of something like this :

  



  import subprocess
cmd = ['./extract_mvs', 'input.mp4']
a = subprocess.Popen(cmd, stdout=subprocess.PIPE)
df = pd.read_csv(a.communicate()[0], sep=',')


  



  But then I get an error : OSError: Expected file path name or file-like object, got <class> type</class>

  



  Can it be fixed and extended so as to read straight from subprocess to pandas ?

  


• How do I formate spaces in terminal for FFMPEG metadata

  22 juillet 2020, par pbendevis

  I can't get FFMPEG to accept any spaces when I try to assign it to the metadata. Below is the command I am using in Terminal on MacOS. It gives me an error : [NULL @ 0x7fce76026600] Unable to find a suitable output format for 'World' World: Invalid argument

  


  ffmpeg -hide_banner \
-i Trolls.World.Tour.2020.Bluray-2160p.m2ts \
-ss 00:10:00 -t 00:1:00 \
-pix_fmt yuv420p10le \
-map_chapters 0 \
-metadata:s:t:0 filename="" -metadata:s:t:0 mimetype="image/jpeg" \
-metadata title=“Trolls World Tour” \
-map 0:0 -metadata:s:v:0 language=eng -metadata:s:v:0 title=“Trolls World Tour” \
-map 0:2 -metadata:s:a:0 language=eng -metadata:s:a:0 title=“Dolby TrueHD 7.1 Atmos” \
-map 0:6 -metadata:s:a:0 language=eng -metadata:s:a:1 title=“AC-3 2.0” \
-c:v libx265 -preset slow -crf 16 \
-x265-params keyint=60:bframes=3:vbv-bufsize=75000:vbv-maxrate=75000:hdr-opt=1:repeat-headers=1:colorprim=bt2020:transfer=smpte2084:colormatrix=bt2020nc:master-display="G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,500)" \
-c:a copy \
Trolls.World.Tour.2020.2160p.BluRay.REMUX.HEVC.TrueHD.7.1.Atmos.mkv


  


  I have tried 'title="Trolls World Tour"' title=Trolls" "World" "Tour to no luck.

  


  Using title="Trolls\ World\ Tour" works but then the title includes the backslashes.

  


  Any thoughts ?

  


• Debian ffmpeg working in terminal but not in php

  30 octobre 2013, par user2938660

  I reinstalled ffmpeg on debian and php exec doesn't work for me anymore when called from php. I'm using :

  if ($success_msg) 
  
  {
  
      $tmp_parts = explode('.', $file['name']);
  
      $ext = array_pop($tmp_parts);
  
      $ext = strtolower($ext);
  
      if($ext == "avi" && $convert_avi == true)
  
      {
  
          $convert_source = _VIDEOS_DIR_PATH.$new_name;
  
          $conv_name = substr(md5($file['name'].rand(1,888)), 2, 10).".mp4";
  
          //$conv_name2 = substr(md5($file['name'].rand(1,888)), 2, 10).".mp4";
  
          $converted_file  = _VIDEOS_DIR_PATH.$conv_name;
  
          //$fastarted_file  = _VIDEOS_DIR_PATH.$conv_name2;
  
          $ffmpeg_command = 'ffmpeg -i '.$convert_source.' -r 20 -g 40 -acodec libfaac -ar 44100 -ab 96k -vcodec libx264 -sameq '.$converted_file;
  
          //$faststart_command = "qt-faststart ".$converted_file." ".$fastarted_file;
  
          shell_exec($ffmpeg_command);
  
          unlink($convert_source);
  
          //shell_exec($faststart_command);
  
          $sql = "UPDATE pm_temp SET url = '".$conv_name."' WHERE url = '".$new_name."' LIMIT 1";
  
          $result = @mysql_query($sql);
  
  }
  
  echo $success_msg;

  this code to convert videos and ffmpeg output is :

  root@1tb:~# ffmpeg -version
  
  ffmpeg version git-2013-10-28-f1f0b01
  
  built on Oct 29 2013 02:05:45 with gcc 4.4.5 (Debian 4.4.5-8)
  
  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab
  
  libavutil      52. 48.100 / 52. 48.100
  
  libavcodec     55. 39.100 / 55. 39.100
  
  libavformat    55. 19.104 / 55. 19.104
  
  libavdevice    55.  5.100 / 55.  5.100
  
  libavfilter     3. 90.100 /  3. 90.100
  
  libswscale      2.  5.101 /  2.  5.101
  
  libswresample   0. 17.104 /  0. 17.104
  
  libpostproc    52.  3.100 / 52.  3.100
  
  root@1tb:~#

  in terminal it works fine just via php not im sure this is server problem and exec is enabled.