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• PHP NetSSH2 command dropped after few minutes

  1er février 2020, par Hamed

  I have an Ubuntu 18.04 server,
  I want to run a ffmpeg command via remote SSH with PHP.
  After around 5 minutes process dropped,
  but it wasn’t returned any error.
  I’ve tested it directly from ssh and there wasn’t any problem.
  Also I’ve increased SSH Connection timeout but my problem is still.

  $ssh = new Net_SSH2('IP_ADDRESS');
  
  $ssh->login('root', 'PASSWORD') or die("Login failed");
  
  $command = "sudo ffmpeg -y -i $path/$film -vf subtitles=$path/$subtitle -vcodec h264 -crf 25 $path/$subtitled";
  
  $ssh->exec($command);

• Is there built in audio preprocessing within Android OS

  28 août 2022, par Larry lu

  I am running a dev team to build an Android application which the major feature is to record user voice and merge it into a long movie. It's a dub film application.

  


  One struggle thing to my dev team is whether the Android OS pre-process the recorded auido file. because we want the very original audio data from the built in Microphone.
If there is a built-in pre-processing inside of Android OS keep updating some data of the recorded aduio file, we want to know what is changed. We can't find any official post from Android speaking about it but would like to confirm from professional.

  


  Many thanks

  


• How to stop a sound when certain other sound is inserted in the mix in ffmpeg ?

  3 avril 2022, par Antonio Oliveira

  I'm using a ffmpeg command that takes a set of sounds, mixes them into a single file, separating them by certain time intervals.

  


  Below is how my command is today.

  


  ffmpeg -i 
close_hh.wav    -i \
crash_l.wav     -i \
crash_r.wav     -i \
floor.wav       -i \
kick_l.wav      -i \
kick_r.wav      -i \
open_hh.wav     -i \
ride.wav        -i \
snare.wav       -i \
splash.wav      -i \
tom_1.wav       -i \
tom_2.wav       -i \
  tom_3.wav  -filter_complex  " [6]adelay=0|0[note_0];  [0]adelay=360|360[note_1];  [6]adelay=1260|1260[note_2];  [0]adelay=1537|1537[note_3];  [6]adelay=2494|2494[note_4];  [5]adelay=2767|2767[note_5];  [0]adelay=2969|2969[note_6];  [6]adelay=3673|3673[note_7];  [5]adelay=3924|3924[note_8];  [0]adelay=4132|4132[note_9];  [0][note_0][note_1][note_2][note_3][note_4][note_5][note_6][note_7][note_8][note_9]amix=inputs=11:normalize=0" record.wav


  


  This is the resulting audio that this command generates :

  


  ffmpg record.wav : https://drive.google.com/file/d/1LFV4ImLKLnRCqZRhZ7OqZy4Ecq5fwT3j/view?usp=sharing

  


  The purpose is to generate a drum recording, so I would like to simulate the dynamics of the hi-hat sounds : When the closed hi-hat is played, the open hi-hat will stop playing immediately if it is still sounding. The same behavior does not happen for any of the other sounds.

  


  One point that makes this a little more challenging is that other sounds can also be played between open hi-hat and closed hi-hat strikes, and theoretically the sound interruption behavior should work normally.

  


  Below is a recording demonstrating the expected result. (My app already reproduces the sound result I need internally, so I just made a simple recording with the microphone to illustrate)

  


  mic record.wav https://drive.google.com/file/d/19x19Fd_URQVo-MMCmGEHIC1SjaQbpWrh/view?usp=sharing

  


  Notice that in the first audio (ffmpeg record.wav) the first sound (open hi-hat) continues playing after the second is played.
In the second audio (mic record.wav) the first sound stops immediately after the second sound is played.

  


  How should the ffmpeg command be to get the expected result ?