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• Mjpeg text based subtitle extraction/replay

  2 décembre 2013, par user3058117

  I have an MJPEG based avi file that I cannot replay satisfactorily.

  The video I can correctly replay in FFPlay but i cannot replay or demux the text based subtitle stream.

  The file contains time/date stamps in the subtitles embedded as ascii text which i can see between the video packets (when viewed in a hex reader).

  FFmpeg cannot identify the subtitle codec b7t can see that there is a subtitle stream.

  Ive tried a number of filter combinations using GraphStudioNext. I found a couple of working solutions (when previewed in GraphStudio when served to avisynth the subtitles had disappeared again. I checked the filtergraph and the pin out from the avi splitter had misteriously disconnected. I cannot find a way out of this.

  Does anyone have any suggestions on how i might demux the subtitle stream(short of writing a converter to extract the text to srt based on the packet timing) ?

  This is my first post so apologies if i havent observed etiquette.

• avcodec/diracdec : Inline svq3_get_ue_golomb() and merge the sign bit decoding into it

  12 janvier 2016, par Michael Niedermayer

  avcodec/diracdec : Inline svq3_get_ue_golomb() and merge the sign bit decoding into it
  This avoids closing and opening the bit reader
  Reviewed-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/diracdec.c

• FFmpeg Executing command error

  7 avril 2016, par Sanket990

  When I conversion mp4 to mp3 using ffmpeg command
  FFmpeg command Execution error- Working directory null IOEXception
  Executing below code.

  File path=Environment.getExternalStorageDirectory();    
  
  try {
  
              String ffmpegCommand="ffmpeg -i "+path.getAbsolutePath()+"/test/1.mp4 -f avi -acodec mp3 "+path.getAbsolutePath()+"/Songss.avi";
  
                Process ffmpegProcess = new ProcessBuilder(ffmpegCommand).redirectErrorStream(true).start();
  
  
  
                String line;
  
                BufferedReader reader = new BufferedReader(new InputStreamReader(ffmpegProcess.getInputStream()));
  
                Log.d("tag", "*******Starting FFMPEG");
  
  
  
                while((line = reader.readLine())!=null){
  
  
  
                    Log.d("tag", "***"+line+"***"); 
  
                }
  
                Log.d("tag","****ending FFMPEG****");
  
  
  
          } catch (IOException e) {
  
              e.printStackTrace(); }

  LogCat

  java.io.IOException: Error running exec(). Command: [/data/data/com.example.ffmpegcommandexecute/ffmpeg -i /mnt/sdcard/Songs.mp4 -vn -s 00:00:10 -acodec libmp3lame output.mp3]
  
   Working Directory: null Environment: [ANDROID_SOCKET_zygote=10, ANDROID_BOOTLOGO=1, EXTERNAL_STORAGE=/mnt/sdcard, ANDROID_ASSETS=/system/app, PATH=/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin, ASEC_MOUNTPOINT=/mnt/asec, LOOP_MOUNTPOINT=/mnt/obb, BOOTCLASSPATH=/system/framework/core.jar:/system/framework/core-junit.jar:/system/framework/bouncycastle.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/android.policy.jar:/system/framework/services.jar:/system/framework/apache-xml.jar:/system/framework/filterfw.jar, EXTERNAL_STORAGE_SD=/mnt/ext_card, EXTERNAL_STORAGE_ALL=/mnt/sdcard:/mnt/ext_card, WTLE_VERSION=3.2.0.patch6.1, ANDROID_DATA=/data, LD_LIBRARY_PATH=/vendor/lib:/system/lib, ANDROID_ROOT=/system, ANDROID_PROPERTY_WORKSPACE=9,65536]
  
      at java.lang.ProcessManager.exec(ProcessManager.java:211)
  
      at java.lang.ProcessBuilder.start(ProcessBuilder.java:195)
  
      at com.example.ffmpegcommandexecute.MJPEGFFMPEGTest$ProcessVideo.doInBackground(MJPEGFFMPEGTest.java:301)
  
      at com.example.ffmpegcommandexecute.MJPEGFFMPEGTest$ProcessVideo.doInBackground(MJPEGFFMPEGTest.java:1)
  
      at android.os.AsyncTask$2.call(AsyncTask.java:264)
  
      at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
  
      at java.util.concurrent.FutureTask.run(FutureTask.java:137)
  
      at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
  
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
  
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
  
      at java.lang.Thread.run(Thread.java:856)
  
   Caused by: java.io.IOException: No such file or directory
  
      at java.lang.ProcessManager.exec(Native Method)
  
      at java.lang.ProcessManager.exec(ProcessManager.java:209)