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• ffprobe or avprobe returning plain text errors in JSON output

  6 mai 2015, par Justin Jenkins

  I’m running avprobe to get stream infomation about a video in JSON ...

  avprobe -loglevel quiet -show_format -show_streams file.m4v -of json

  This is basically the exact same thing as ffprobe or ffmpeg -i (and I get the same error.)

  ffprobe -loglevel quiet -show_format -show_streams file.m4v -print_format json

  The command works most of the time ... however, on occation I’ll have a video that has an odd stream in it that is "unsupported" and I’ll get back something like this (abbreviated.)

  Unsupported codec with id 94213 for input stream 2
  
  {  "format" : {
  
      "filename" : "file.m4v",
  
      "nb_streams" : 3,
  
      "format_name" : "mov,mp4,m4a,3gp,3g2,mj2" ...

  When I run the command I get back JSON + an error in plain text, which makes the result invalid JSON and I have to "clean it up" later.

  I’m suppressing errors from the output -loglevel quiet but the error still show up.

  How can I tell avprobe/ffprobe to not show this error and hence get back a proper JSON object ?

  ---

  Longer Output Examples

  ffprobe, from source, MacOS

  ffprobe version 0.9.1-subsplash, Copyright (c) 2007-2012 the FFmpeg developers
  
    built on Feb  5 2012 01:35:36 with gcc 4.2.1 (Apple Inc. build 5664)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --as=yasm --extra-version=subsplash --disable-shared --enable-static --disable-ffplay --disable-ffserver --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libfaac --enable-libvorbis --enable-libtheora --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --arch=x86_64 --enable-runtime-cpudetect --enable-nonfree
  
    libavutil    51. 32. 0 / 51. 32. 0
  
    libavcodec   53. 42. 4 / 53. 42. 4
  
    libavformat  53. 24. 2 / 53. 24. 2
  
    libavdevice  53.  4. 0 / 53.  4. 0
  
    libavfilter   2. 53. 0 /  2. 53. 0
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.m4v':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2012-01-01 06:38:43
  
      encoder         : HandBrake 0.9.5 2011010300
  
    Duration: 00:30:47.53, start: 0.000000, bitrate: 1558 kb/s
  
      Chapter #0.0: start -0.066733, end 17.784433
  
      Metadata:
  
        title           : Chapter  1
  
  
  
  ...
  
  
  
      Stream #0:2(und): Subtitle: mov_text (text / 0x74786574)
  
      Metadata:
  
        creation_time   : 2012-01-01 06:38:43
  
        handler_name    : 
  
  Unsupported codec with id 94213 for input stream 2
  
  {
  
  
  
  ...

  avprobe, from source, Ubuntu Linux

  avprobe version 10_alpha1-6:10~~git20130307.4be368b-1~quantal1, Copyright (c) 2007-2013 the Libav developers
  
    built on Mar  7 2013 22:12:44 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.m4v':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2012-01-01 06:38:43
  
      encoder         : HandBrake 0.9.5 2011010300
  
    Duration: 00:30:47.53, start: 0.000000, bitrate: 1558 kb/s
  
      Chapter #0.0: start -0.066733, end 17.784433
  
      Metadata:
  
        title           : Chapter  1
  
  
  
  ...
  
  
  
      Stream #0.2(und): Subtitle: text / 0x74786574
  
      Metadata:
  
        creation_time   : 2012-01-01 06:38:43
  
  Unsupported codec with id 94213 for input stream 2
  
  {
  
  
  
  ...

• Debugging an MP4 opened by VLC but not by ffplay

  15 mai 2017, par MaMazav

  I’m writing a code which creates MP4 files. To check it I’ve created an MP4 file.

  The file is played correctly by VLC and Firefox, but not by ffplay or by Chrome. I guess the file contains error which VLC can cope with but more aggressive MP4 reader cannot.

  I’ve thought about repairing the file and check what are the differences to fix my code. However I tried some programs to repair MP4 files, without success until now.

  Can someone reccommend another way to debug the problem, or a good tool to fix MP4 files ? The file is a fragmented MP4 contains both the init section (ftyp, moov boxes) and one fragment section (moof and empty sidx).

  Here is the video file :

  https://www.dropbox.com/s/rojxzvkfxfj31u8/400k00001-3_serialized.mp4?dl=0

  EDIT : It doesn’t work also in Firefox, when using Media Source Extensions like in this example :
  http://people.mozilla.org/ jyavenard/tests/mse_mp4/paper.html

  (don’t forget to enable MSE on Firefox, as explained here :
  http://www.linuxveda.com/2015/04/02/enable-mse-native-html5-support-firefox-linux/)

  EDIT2 : In chrome ://media-internals, I see the following error with the above example :
  Append : stream parsing failed. Data size=131072 append_window_start=0 append_window_end=inf

  (Change the URL to be the file and change the codec to be ’avc1.4d401f’ instead of ’avc1.64000d,mp4a.40.2’).

• “only position independent executables (PIE) are supported”

  3 juin 2015, par Karthikeyan

  I am using FFMPEG support library to convert bunch of images to video. It works fine on earlier version of the lollipop. But in the lollipop it generates the following error. ***error: only position independent executables (PIE) are supported.*** I know the PIE Security restrictions has been changed in lollipop, but i don’t know how to fix it.

  From my knowledge it may have two possible solutions,

  either

  we need to relocate the FFMPEG library assets to the SDCard and we have to refer them from our coding, if this is the answer what are all the steps to be followed ?

  or

  Is there any update in the FFMPEG library for android lollipop.

  If both are wrong can you provide me with the proper solution.

  Many thanks...

  Here is my code

     try {
  
              String[] ffmpegCommand = {"/data/data/com.mobvcasting.mjpegffmpeg/ffmpeg", "-r", ""+p.getPreviewFrameRate(), "-b", "1000000", "-vcodec", "mjpeg", "-i", 
  
                      Environment.getExternalStorageDirectory().getPath() + "/req_images/frame_%05d.jpg", Environment.getExternalStorageDirectory().getPath() + "/req_images/video.mov"};
  
  
  
              ffmpegProcess = new ProcessBuilder(ffmpegCommand).redirectErrorStream(true).start();            
  
  
  
              OutputStream ffmpegOutStream = ffmpegProcess.getOutputStream();
  
              BufferedReader reader = new BufferedReader(new InputStreamReader(ffmpegProcess.getInputStream()));
  
  
  
              String line;
  
  
  
              Log.v(LOGTAG,"***Starting FFMPEG***");
  
              while ((line = reader.readLine()) != null)
  
              {
  
                  Log.v(LOGTAG,"***"+line+"***");
  
              }
  
              Log.v(LOGTAG,"***Ending FFMPEG***");
  
  
  
  
  
          } catch (IOException e) {
  
              e.printStackTrace();
  
          }
  
  
  
          if (ffmpegProcess != null) {
  
              ffmpegProcess.destroy();        
  
          }