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• Faster way of getting number of key frames than "show_frames" in ffprobe ?

  19 novembre 2016, par Will Tower

  I’m making a little in-house utility using ffmpg and ffprobe. Works fine and does what is needed : give a count of the number of key frames in a video file plus some other details.

  Alas, with the large video files this will be used on it can take many seconds for show_frames to return – and I then have to parse the JSON dump of frame data and keep a running count of the total key frames.

  Is there a faster way ? Perhaps it is listed in the "stream" or "format" data dumps and I am not recognizing what it is being called ? I’ve been through the ffmpg and ffprobe docs and didn’t find anything else.

• I have a file that purports to be "uncompressed mov" that I want to convert to raw using ffmpeg

  9 août 2015, par Lyman Hurd

  I am running Ubuntu. Here is what I receive and also cannot play the movie with vlc or totem, however the sender insists that these files play on a Mac using QuickTime. Thoughts as to what might be wrong ?

  ~/bin/ffmpeg -i movie.mov ffmpeg version N-50051-g8d0757e Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug  8 2015 18:44:04 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-libvpx --enable-libx264 --prefix=/home/lhurd --enable-gpl
  
    libavutil      52. 17.102 / 52. 17.102
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.100 / 54. 63.100
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 38.103 /  3. 38.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  movie.mov: Invalid data found when processing input

  Here’s an "od -c" of the head which at least shows that the file isn’t raw :

  0000000  \0 005 026  \a  \0 002  \0  \0   M   a   c       O   S           X
  
  0000020                                  \0 002  \0  \0  \0  \t  \0  \0
  
  0000040  \0   2  \0  \0  \0   F  \0  \0  \0 002  \0  \0  \0   x  \0  \0
  
  0000060  \0  \0   M   o   o   V   T   V   O   D  \0  \0  \0  \0  \0  \0
  
  0000100  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0
  
  0000120  \0  \0  \0  \0   A   T   T   R  \0  \0  \0  \0  \0  \0  \0   x
  
  0000140  \0  \0  \0   x  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0
  
  0000160  \0  \0  \0  \0  \0  \0  \0  \0
  
  0000170

• Android Ffmpeg- Root Permission not granted to "su" Working Directory:null

  24 juillet 2015, par Workaholic Er

  I have compiled ffmpeg for android using ndk r10e on os x but it does not produce ffmpeg.so. All other libraries are generated. I have been searching this for over a week. I have tried various methods to execute ffmpeg command but none were successful. I used

  Process p=new ProcessBuilder("su /data/data/com.example.ffmpegtem/").start();
  
  
  
  Process p = Runtime.getRuntime().exec(
  
                  getBaseContext().getApplicationInfo().nativeLibraryDir); 
  
  
  
  Process p = Runtime.getRuntime().exec(Environment.getExternalStorageDirectory().getPath()); 
  
  Process p = Runtime.getRuntime().exec("chmod 700 /data/data/com.example.ffmpegtem/app_bin/ffmpeg");

  All resulted in IOException-Working Directory : null. I also tried Shell Callback method provided by Github android ffmpeg library project which resulted in Nullpointerexception. I have written read/write permission.

  Convert 1 image to video code :

  DataOutputStream os = new DataOutputStream(chperm.getOutputStream());
  
  os.writeBytes("-loop 1 -i " + inpath + " -c:v libx264 -t 15 -pix_fmt yuv420p -vf scale=320:240 "+outpath);

  What am I doing wrong ? Please help