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• Batch Merge Large Number of Video Files by Pair

  16 février 2021, par dellyice

  I have a directory full of 1000+ short h.264 video clips that I'd like to batch merge via ffmpeg one pair at a time in Windows (eg, file1.mp4 is concatenated with file2.mp4, then file3.mp4 is concatenated with file4.mp4, etc, to ultimately produce half as many resultant videos, each containing two merged parent clips), and everything I've tried from fudging together scripts from other answers on the site has resulted in messes too embarrassing to mention.

  


  Each pair of videos is cut from a common source vid, so the concat demuxer should be fine for merging them. If it helps, each set of videos follows the naming scheme "filename"_1.mp4 and "filename"_2.mp4, so they're correctly paired alphabetically, and the _1 and _2 files can obviously be easily separated into different folders if need be.

  


  Sorry if any of this is terribly vague. If I had any productive work to show, I'd do so. Many thanks for any help.

  


• How to Buffer Audio Streams for an Android Internet Radio Application

  16 février 2014, par burakk

  We have a radio application that streams MP3 over HTTP using an instance of the MediaPlayer class. In devices running new Android versions (i.e, Note 3 running Android 4.3), the music plays for about half a second, and then waits (buffers ?) for up to 10 seconds, and plays again. I guess this unwanted behavior is due to the increased buffer size of the MediaPlayer in newer Android versions. Since there's no way to set the buffer size, there are few options left :

  • Stream Proxy
  • AudioTrack + MP3 Decoder
  • OpenSL

  I have read many posts about those, and concluded that the best way would be using AudioTrack with an MP3 decoder like FFMPEG. However, I am open to suggestions and any guidances since I do not have any knowledge about Android NDK, JNI and FFMPEG...

• UnsupportedAudioFileException in LIUM Speaker Diarization after re-sampling

  14 septembre 2016, par RAVI D PARIKH

  I am trying to configure LIUM tool for speaker diarization. This question is a follow up of UnsupportedAudioFileException in LIUM Speaker Diarization

  I have tried re sampling the file using sox and ffmpeg

  I am new to any sorts of programming and i have followed all steps described in LIUM quick start guide and the above link. I still get the same error. I think my input file has issues related to header as mentioned by Nikolay Shmyrev in the above link however i have no clue on how to solve it.

  My code is as below :

  java –jar  C:\Users\Ravi\Desktop\LIUM_SpkDiarization-8.4.1.jar \ --fInputMask= C:\Users\Ravi\Desktop\converted_f2.wav--sOutputMask= C:\Users\Ravi\Desktop\converted_converted_2.seg -–help --doCEClustering

  Error :

  10:52.037 SEVERE AudioFeatureSetFa  FileNotFoundException
  
  java.io.FileNotFoundException:
  
          at java.io.FileInputStream.open0(Native Method)
  
          at java.io.FileInputStream.open(Unknown Source)
  
          at java.io.FileInputStream.<init>(Unknown Source)
  
          at com.sun.media.codec.audio.mp3.JS_MP3FileReader.getAudioFileFormat(JS_MP3FileReader.java:82)
  
          at javax.sound.sampled.AudioSystem.getAudioFileFormat(Unknown Source)
  
          at fr.lium.spkDiarization.libFeature.AudioFeatureSetFactory.getAudio(AudioFeatureSetFactory.java:162)
  
          at fr.lium.spkDiarization.libFeature.AudioFeatureSetFactory.MakeFeature(AudioFeatureSetFactory.java:207)
  
  </init>

  The input file is at https://drive.google.com/file/d/0B7Fqe9EX5JbgT09BcXpSREd4em8/view?usp=sharing

  Input File Name:converted_f2.wav

  I have put the command and the full output of the prompt in a word document at

  https://drive.google.com/file/d/0B7Fqe9EX5JbgUUl6THNCZFgxRnM/view?usp=sharing

  The inpiut file has correct sampling rate and other parameters and thus i am not able to understand the cause of the error.
  Thanks a lot for the help

  Regards,
  Ravi