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• How to avoid stopping or record all dynamic videos in the process of capturing screen video with ffmpeg from a python program ?

  3 décembre 2020, par fengnix

  I have many robotframework test cases and in the first case, a ffmpeg command like the following is invoked to record the whole running process :

  


  ffmpeg -framerate 30 -f gdigrab -i desktop -c:v libx264rgb -crf 0 -preset ultrafast output.mkv


  


  Whenever I firstly run all cases and then manuually run the above command from an addition command console, the recorded video always looks fine, it looks like all contents on the screen can be correctly captured.

  


  However, once I execute the command the same as the above one in the first case by call the following code :

  


  p=subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)


  


  and then in the final test case the record process is stopped by calling the following code to tell ffmpeg that we want to stop the recording :

  


  p.stdin.write(bytes("q",'UTF-8'))  


  


  the final result video only contain correct contents of the "start" and the "end" of the whole process, but all other contents no longer changed and seemd just a static image, which means all the dynamic effects on the screen cannot be captured.

  


  Could anyone be so kind as to let me know what the matter is and how to solve it ?

  


• How to add subtitle in Video using Ffmpeg Command

  8 mai 2014, par Sanket990

  I m executing below command and getting Stream #0:0 : Subtitle : unknown_codec
  (codec unknown_codec) not found for output stream #0:0
  FFmpeg command :

  final String demoVideoPath =   "/sdcard/b.mp4";
  
  final String subTitlePath="/sdcard/srtf.srt";
  
  String ffmpegCommand[] = { "ffmpeg", "-i", demoVideoPath, "-i", subTitlePath,
  
                          "-map","1", "-c", "copy","-strict", "experimental","-c:v","mpeg","-crf","23","-preset","veryfast",
  
                            "/sdcard/output.avi" };

  LogCat

   Shellout[srt @ 0xc03930] Estimating duration from bitrate, this may be inaccurate
  
   ShelloutInput #1, srt, from '/sdcard/srtf.srt':
  
  Shellout  Duration: N/A, bitrate: N/A
  
   Shellout    Stream #1:0: Subtitle: srt
  
   ShelloutPlease use -b:a or -b:v, -b is ambiguous
  
   ShelloutOutput #0, avi, to '/sdcard/output.avi':
  
  Shellout  Metadata:
  
   Shellout    major_brand     : isom
  
  Shellout    minor_version   : 512
  
   Shellout    compatible_brands: isomiso2mp41
  
  
  
  Shellout    creation_time   : 2013-12-20 11:33:07
  
  Shellout    encoder         : Lavf51.12.1
  
   Shellout    Stream #0:0: Subtitle: unknown_codec
  
   ShelloutStream mapping:
  
  Shellout  Stream #1:0 -> #0:0 (srt -> ?)
  
  ShelloutEncoder (codec unknown_codec) not found for output stream #0:0

  How to handle unknown_codec error.

• Museum of Multimedia Software, Part 3

  18 août 2010, par Multimedia Mike — Software Museum

  Discreet Cleaner 5
  Capture, author, encode, and publish multimedia in Real, QuickTime, Windows Media, MP3, DV, and MPEG formats. This package has a copyright date of 2001 (thus predating Flash video by a few years). This software seems to have since been purchased by Autodesk and is up to version 6.5 (which does support Flash video).

  
  
  

  Discreet Plasma
  "Web 3D Design." Package is copyright 2002. Like the last package, this package also makes reference to Discreet being a division of Autodesk. Sure enough, Autodesk purchased them in 1999 and would later rename them Autodesk Media and Entertainment.

  
  
  

  Debabelizer
  "The Graphics Processing Toolbox." Looking down its list of features on the box copy, I honestly wonder if it can accomplish anything that ImageMagick can’t.

  
  
  

  MatchWare Mediator 7
  "Create Flash, HTML & CD-Rom Presentations." Wow, version 7, and with a latest copyright date of 2002 on the box. There’s still a top-Google-hit web page for MatchWare Mediator 9, this one instead emphasizing interactive CDs, HTML, and then Flash.

  
  
  

  Final Cut Pro v1.2.5
  Promotional copy Apple’s video editing software. No copyright date, but it requires a PowerPC G3 or G4 and Mac OS 9.

  
  
  

  Apple Keynote
  More Apple software that I think can technically be classified as multimedia-related. I’m not sure which version this is.