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• Apply filters to video while preview and save it with applied filter and original audio in android

  11 juillet 2016, par Rajkumar

  Dear geeks i m newbie to video processing. i want to apply a filter to a video at runtime, and i want to save that video after filter applied.
  Regarding this i m doing a research. I has gone through many libraries but i m struggling to achive my aim.

  Developement environment

  Migw-64 with windows 7 64 bit
  Android Studio 2.1 preview 5
  heap space 4GB
  com.android.tools.build:gradle:2.1.0
  android-ndk-r12-win-x86_64
  com.android.tools.build:gradle-experimental:0.7.0 —> to build NDK

  I have tried

  1)AndroidFastImageprocessingLibrary

  Chrisbatt -> AndroidFastImageProcessing in github
  github.com/chrisbatt/AndroidFastImageProcessing
  This library use GLSurfaceview to display filters but we could not save it to mp4 file

  so i found another implementation of it
  icmobilelab -> AndroidFastImageProcessing in github
  github.com/icmobilelab/AndroidFastImageProcessing/blob/master/framework/FastImageProcessing/src/project/android/imageprocessing/output/VideoFileEndpoint.java
  This library use JavaCV with ffmpeg compiled. But it failed.

  2)JavaCV
  JavaCV use outdated ffmpeg and it abondond

  3)Grafika -> in github
  github.com/google/grafika
  I tried Android Fast Image Processing with RecordFBOActivity in grafika. But i m failed. This library use MediaRecorder to record the contents of GLSurfaceView. But it records video without audio(I have tested the RecordFBOActivity and analyze the code )

  4)filter packs in platform_frameworks
  github.com/android/platform_frameworks_base/blob/master/media/mca/filterpacks/java/android/filterpacks/videosink/MediaEncoderFilter.java
  its android 4.2 edited core. i can’t run this code because too many jni dependencies.

  5)ffmpeg
  github.com/guardianproject/android-ffmpeg
  i tried ffmpeg3.1 compilation procedure implemented by guardianproject. it successfullay built a static library but i cannot build dynamic library( so files). i m stuck with a linker error. I think the linking order matters. i tried the linking order specified in below link
  https://fritzone.wordpress.com/2010/05/11/link-with-static-ffmpeg/
  but it won’t help. the following error occurs

  [armeabi-v7a] SharedLibrary  : libffmpeg.so
  
  jni/ffmpeg.c:200: error: undefined reference to 'av_frame_alloc'
  
  jni/ffmpeg.c:201: error: undefined reference to 'av_frame_alloc'
  
  jni/ffmpeg.c:209: error: undefined reference to 'av_register_all'
  
  jni/ffmpeg.c:210: error: undefined reference to 'avfilter_register_all'
  
  jni/ffmpeg.c:45: error: undefined reference to 'avformat_open_input'
  
  jni/ffmpeg.c:50: error: undefined reference to 'avformat_find_stream_info'
  
  jni/ffmpeg.c:56: error: undefined reference to 'av_find_best_stream'
  
  jni/ffmpeg.c:63: error: undefined reference to 'av_opt_set_int'
  
  jni/ffmpeg.c:66: error: undefined reference to 'avcodec_open2'
  
  jni/ffmpeg.c:67: error: undefined reference to 'av_log'
  
  jni/ffmpeg.c:78: error: undefined reference to 'avfilter_get_by_name'
  
  jni/ffmpeg.c:79: error: undefined reference to 'avfilter_get_by_name'
  
  jni/ffmpeg.c:80: error: undefined reference to 'avfilter_inout_alloc'
  
  jni/ffmpeg.c:81: error: undefined reference to 'avfilter_inout_alloc'
  
  jni/ffmpeg.c:85: error: undefined reference to 'avfilter_graph_alloc'
  
  jni/ffmpeg.c:98: error: undefined reference to 'avfilter_graph_create_filter'
  
  jni/ffmpeg.c:106: error: undefined reference to 'avfilter_graph_create_filter'
  
  jni/ffmpeg.c:113: error: undefined reference to 'av_int_list_length_for_size'
  
  jni/ffmpeg.c:113: error: undefined reference to 'av_opt_set_bin'
  
  jni/ffmpeg.c:116: error: undefined reference to 'av_log'
  
  jni/ffmpeg.c:131: error: undefined reference to 'av_strdup'
  
  jni/ffmpeg.c:142: error: undefined reference to 'av_strdup'
  
  jni/ffmpeg.c:147: error: undefined reference to 'avfilter_graph_parse_ptr'
  
  jni/ffmpeg.c:151: error: undefined reference to 'avfilter_graph_config'
  
  jni/ffmpeg.c:155: error: undefined reference to 'avfilter_inout_free'
  
  jni/ffmpeg.c:156: error: undefined reference to 'avfilter_inout_free'
  
  jni/ffmpeg.c:218: error: undefined reference to 'av_read_frame'
  
  jni/ffmpeg.c:223: error: undefined reference to 'avcodec_decode_video2'
  
  jni/ffmpeg.c:230: error: undefined reference to 'av_frame_get_best_effort_timestamp'
  
  jni/ffmpeg.c:233: error: undefined reference to 'av_buffersrc_add_frame_flags'
  
  jni/ffmpeg.c:234: error: undefined reference to 'av_log'
  
  jni/ffmpeg.c:240: error: undefined reference to 'av_buffersink_get_frame'
  
  jni/ffmpeg.c:171: error: undefined reference to 'av_rescale_q'
  
  jni/ffmpeg.c:246: error: undefined reference to 'av_frame_unref'
  
  jni/ffmpeg.c:248: error: undefined reference to 'av_frame_unref'
  
  jni/ffmpeg.c:251: error: undefined reference to 'av_packet_unref'
  
  jni/ffmpeg.c:254: error: undefined reference to 'avfilter_graph_free'
  
  jni/ffmpeg.c:255: error: undefined reference to 'avcodec_close'
  
  jni/ffmpeg.c:256: error: undefined reference to 'avformat_close_input'
  
  jni/ffmpeg.c:257: error: undefined reference to 'av_frame_free'
  
  jni/ffmpeg.c:258: error: undefined reference to 'av_frame_free'
  
  jni/include/libavutil/error.h:111: error: undefined reference to 'av_strerror'
  
  collect2.exe: error: ld returned 1 exit status
  
  make: *** [obj/local/armeabi/libffmpeg.so] Error 1

  6)MediaCodec, MediaExtractor,MediaRecord,MediaMuxer
  finally i planned to combine AndroidFastImageProcessing with MediaCodec, MediaExtractor,MediaRecord,MediaMuxer.
  so i try to Extract audio from video using mediamuxer
  https://gist.github.com/sayan801/9a39ccad0818d2b3499a
  I use mp4 video (MIME Type video/avc that have 2 tracks audio and video) to extract audio
  but the resultant file is corrupted (just 4 kb)

  I think this question is another view of the existing problem
  if anybody experienced this problem please guide me
  Thanks

• mp4 to webm and ogv conversion not working using ffmpeg on linux server

  9 novembre 2016, par user75472

  I have a cron job to convert existing mp4 video file to ogv and webm using ffmpeg

  I have wordpress site with a page where user are allowed to upload mov and mp4 files. After the file is uploaded image is created from the video file and mov file is converted to mp4 successfully.

  However I need to concert uploaded mp4 file to webm and ogv to video work on all browsers. So I have set up cron job. Here is my code :

  include_once "../wp-config.php";
  
  ini_set('max_execution_time', 660); // 11 minutes
  
  // Get the path to the upload directory.
  
  $wp_upload_dir = wp_upload_dir();
  
  $dir = $wp_upload_dir['path'].'/';
  
  
  
  // Open a directory, and read its contents
  
  if (is_dir($dir)){
  
    if ($dh = opendir($dir)){
  
      while (($file = readdir($dh)) !== false){
  
        //echo "filename:" . $file . "<br />";
  
        $files = explode(".", $file);
  
        //echo end($fileinfo);
  
        if(end($fileinfo) == 'mp4') {
  
            $ffmpegPath = '/usr/local/bin/'; // linux
  
          //$ffmpegPath = 'C:\\ffmpeg\\bin\\'; // win
  
          if(!file_exists($dir.$files[0].'.webm')) {
  
  
  
                  $destFile = $dir.$files[0].'.webm';
  
  
  
                  $cmd = $ffmpegPath."ffmpeg -i ".$srcFile." -c:v libvpx -minrate 3900k -maxrate 3900k -b:v 3900k -c:a libvorbis ".$destFile;
  
  
  
            exec($cmd, $output, $retval);
  
            var_dump($output);
  
            var_dump($retval);
  
                  //exec($cmd);
  
          }
  
          if(!file_exists($dir.$files[0].'.ogv')) {
  
              //var_dump($fileinfo);
  
                  $destFile = $dir.$files[0].'.ogv';
  
  
  
                  $cmd1 = $ffmpegPath."ffmpeg -i ".$srcFile." -acodec libvorbis -ac 2 -ab 128k -ar 44100 -b:v 1200k ".$destFile;
  
  
  
            exec($cmd1, $output1, $retval1);
  
            var_dump($output1);
  
            var_dump($retval1);
  
          }
  
        }
  
      }
  
      closedir($dh);
  
    }
  
  }

  This works perfectly alright on windows but not working on linux, production server.

  I am missing something ?

• Python - insert lines on txt following a sequence without overwriting

  17 octobre 2016, par Neo Herakles

  I want to insert the name of a file before each file name obtained through glob.glob, so I can concatenate them through FFMPEG by sorting them into INTRO+VIDEO+OUTRO, the files have to follow this order :

  INSERTED FILE NAME
  FILE
  INSERTED FILE NAME
  INSERTED FILE NAME
  FILE
  INSERTED FILE NAME
  INSERTED FILE NAME
  FILE
  INSERTED FILE NAME
  

  This is this code I’m using :

  import glob
  
  open("Lista.txt", 'w').close()
  
  file = open("Lista.txt", "a")
  
  list =glob.glob("*.mp4")
  
  for item in list:
  
    file.write("%s\n" % item)
  
  file.close()
  
  
  
  f = open("Lista.txt", "r")
  
  contents = f.readlines()
  
  f.close()
  
  
  
  for x,item in enumerate(list):
  
      contents.insert(x, "CTA\n")
  
  f = open("Lista.txt", "w")
  
  contents = "".join(contents)
  
  f.write(contents)
  
  print f
  
  f.close()

  But I obtain the values in the wrong order :
  

  INSERTED FILE NAME
  INSERTED FILE NAME
  INSERTED FILE NAME
  FILE
  FILE
  FILE
  

  How could I solve this ?
  EDIT : As pointed out, maybe the issue is being caused by modifying a list that I’m currently using.