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• SOLVED - Compiling FFMPEG on Windows with Cywin and NDK r5

  19 mai 2012, par protectedmember

  This isn't a question - it's an answer for alll of you who have been facing the same problems as I have. I've been trying to compile this thing for a while now and I know of the numerous posts floating around the internet offering help. I have read and tried most of the suggestions and wanted to colate my success into this single post for others to benefit from.

  Since I don't have a blog, I thought it wouldn't hurt to post on here instead.

  I have managed to compile FFMPEG 0.10.3 (Freedom) on Windows 7 (32 bit) using NDK r5 and Cygwin. The steps :

  1 - Download/install Cygwin in the root of your C drive. I'm not going to give instructions on this, it's simple enough and there are plenty of tutorials on this.

  2 - Download NDK r5 from here and extract to the root of your C drive.

  3 - Download FFMPEG 0.10.3 from here and extract to the root of your C drive.

  4 - Open the file 'configure' in the root of the FFMPEG directory in a text editor.

  5 - Comment out lines 2073, 2074 and 2075.

  6 - Below 2075, add the following line :

  TMPDIR=c :/cygwin/tmp

  7 - Download this script (thankyou roman10) and place it inside your FFMPEG root directory. Rename the file to

  build_android.sh

  8 - Open the script in a text editor and edit line 17 to read

  c :/android-ndk-r5

  9 - Click start > run and type "bash" (without the speech marks) and press enter.

  10 - Type the following and press enter :

  cd /cygdrive/c/ffmpeg-0.10.3

  11 - Type the following and press enter :

  ./build_android.sh

  12 - Sit back and wait... libffmpeg.so will soon appear in your "c :\ffmpeg-0.10.3\android\" directory (where is defined in the bottom of the script from roman10's blog). The default architecture is armv7-a.

  The script from roman10's blog will actually compile quite a large shared object (.so) file. The compiler flags can be adjusted to suit your needs in the script from roman10's blog.

  I hope this helps,

  P.

• Adding current time as timestamp in H.264 raw stream with few frames

  2 avril 2020, par Michaël

  I have a program that spits out an H.264 raw stream (namely, screenrecord on Android). I'm using FFmpeg to add a PTS (presentation time stamp) on the frames as follows :

  



  $ my-program | ffmpeg -i - -filter:v setpts='(RTCTIME - RTCSTART) / (TB * 1000000)' out.mp4


  



  This filter computes the current time, and puts it as the PTS.

  



  The trouble is that my-program does not produce any output if there isn't any change in the video. Since FFmpeg seems to wait for a bunch of frames before putting them through the setpts filter, the computed PTS won't be correct. In particular, the last frame of a sequence will be timestamped when the next sequence starts.

  



  Is there a way (with FFmpeg or otherwise) to add the current time as PTS to H.264 raw frames, where "current time" is when receiving the frame, rather than outputting it ?

  



  Note : The problem is not from buffering from the pipe.

  


• Psychopy gives the ffmpeg error and does not play the videos

  17 août 2017, par I.Nuel

  I want to create an experiment with Psychopy in which I will present randomly video that participant will have to evaluate.

  I have created a routine with my MovieStim and my Rating response and a Loop with my conditions file (in which are my video files videoname.wmv).
  All my videos are in the same folder as my experiment.

  I have specified the MovieStim with a variable refering to my Loop’s column ($Stimulus).

  But when I run the experiment I have this message.

  Running: E:\Thèse ESPRIT\Approach_Aversion\Experience_AA\Approach_Aversion_lastrun.py 
  
  pyo version 0.8.0 (uses single precision)
  
  WARNING:root:Warning: could not find imageio's ffmpeg executable:
  
  [Error 5] Accès refus: 'C:\\Program Files (x86)\\PsychoPy2\\lib\\site-packages\\imageio\\resources\\ffmpeg\\ffmpeg.win32.exe'
  
  Traceback (most recent call last):
  
    File "E:\Thèse ESPRIT\Approach_Aversion\Experience_AA\Approach_Aversion_lastrun.py", line 105, in <module>
  
      depth=0.0,
  
    File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.84.2-py2.7.egg\psychopy\contrib\lazy_import.py", line 120, in __call__
  
      return obj(*args, **kwargs)
  
    File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.84.2-py2.7.egg\psychopy\visual\movie3.py", line 124, in __init__
  
      self.loadMovie(self.filename)
  
    File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.84.2-py2.7.egg\psychopy\visual\movie3.py", line 170, in loadMovie
  
      self._mov = VideoFileClip(filename, audio=(1 - self.noAudio))
  
    File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\moviepy\video\io\VideoFileClip.py", line 55, in __init__
  
      reader = FFMPEG_VideoReader(filename, pix_fmt=pix_fmt)
  
    File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\moviepy\video\io\ffmpeg_reader.py", line 32, in __init__
  
      infos = ffmpeg_parse_infos(filename, print_infos, check_duration)
  
    File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\moviepy\video\io\ffmpeg_reader.py", line 237, in ffmpeg_parse_infos
  
      proc = sp.Popen(cmd, **popen_params)
  
    File "C:\Program Files (x86)\PsychoPy2\lib\subprocess.py", line 710, in __init__
  
      errread, errwrite)
  
    File "C:\Program Files (x86)\PsychoPy2\lib\subprocess.py", line 958, in _execute_child
  
      startupinfo)
  
  WindowsError: [Error 2] Le fichier spécifié est introuvable
  
  </module>

  It seems to be something wrong with the ffmpeg executable but I don’t understand what.

  Do you have any idea ?

  Thank you very much fo advance !

  Have a nice day.

  Ivane