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• pyffmpeg segmentation fault on osx

  1er septembre 2011, par gok

  I am having trouble installing and using pyffmpeg in OSX. (Snow Leopard)

  I tried different versions. Only configuration that seems to install is Python2.6, Cython 0.13 and pyffmpeg 2.0. (Python, ffmpeg and cython is installed with MacPorts and pyffmpeg with setup.py)

  But with that when I try to open a file

  stream=pyffmpeg.VideoStream()
  
  stream.open(filepath)

  it gives this error :

  Traceback (most recent call last):
  
    File "test.py", line 24, in test
  
      stream.open(filepath)
  
    File "pyffmpeg.pyx", line 2467, in pyffmpeg.VideoStream.open (pyffmpeg.c:16607)
  
    File "pyffmpeg.pyx", line 1920, in pyffmpeg.FFMpegReader.open (pyffmpeg.c:11361)
  
  IOError: Unable to open file test.mp4 (url_fopen)
  
  Segmentation fault

  Any idea what's wrong ?

• 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.

  


• Video editor for android - FFmpeg won't compile on windows ?

  4 décembre 2014, par Zoe

  Im trying to make a video editor for android (I’ve never made an android app before)

  After searching for libraries to use I came across FFmpeg but I’m having trouble getting it to compile on Windows 7.

  I’m currently using Eclipse and have the most recent android SDK and ndk.

  I’ve been trying to follow tutorials on the internet including roman10’s (http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/) but they all seem specific to Linux.

  Yesterday, I thought I’d give up and just dual boot Ubuntu on my windows laptop but of course that was messing up too. I shrank my partition and booted Ubuntu of a USB but the installer was detecting there is no OS on my laptop and not giving me the option to install it alongside windows 7.

  So, can FFmpeg be compiled for android on windows ? Or is there another library I could use to make a video editor that can ?

  Or should I just persist with dual booting ubuntu ?

  Thanks