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• Transcoding with ffmpeg libfaac reduces the audio duration

  20 juillet 2012, par sky609

  I have to transcode a mpegts file : input.ts(H.264 and AAC)
  So I use the following command line :
  ffmpeg -y -i input.ts -acodec libfaac -vcodec copy out.ts
  But I find that the duration of output.ts's audio is shorter than that of the input.ts !

  If I do the following iterations, the output's audio will be shorter and shorter.

  ffmpeg -y -i out.ts -acodec libfaac -vcodec copy out-iter1.ts
  
  ffmpeg -y -i out-iter1.ts -acodec libfaac -vcodec copy out-iter2.ts
  
  ffmpeg -y -i out-iter2.ts -acodec libfaac -vcodec copy out-iter3.ts
  
  ffmpeg -y -i out-iter3.ts -acodec libfaac -vcodec copy out-iter4.ts
  
  ffmpeg -y -i out-iter4.ts -acodec libfaac -vcodec copy out-iter5.ts

  My ffmpeg's version is 0.6.6. libfaac's version is 1.28.

  input.ts's audio duration is 10.432 seconds. out-iter5.ts's audio duration is 10.56 seconds

  And I have also tried ffmpeg with version 0.11.
  And it makes the audio longer than the original input.

  So my question is : how to make sure the output's audio duration is same as the input's audio.
  Since libfaac will make the audio shorter, how can I compensate for it ?
  (For some reason I can't use -acodec copy directly.) Any suggestions ?

• transcoding with ffmpeg libfaac makes auido's duration shorter

  20 juillet 2012, par sky609

  I have to transcode a mpegts file : input.ts(H.264 and AAC)
  So I use the following command line :

          "ffmpeg -y -i input.ts -acodec libfaac -vcodec copy out.ts"

  But I find that the duration of output.ts's audio is shorter than that of the input.ts !

  If I do the following iterations, the output's audio will be shorter and shorter.

          "ffmpeg -y -i out.ts -acodec libfaac -vcodec copy out-iter1.ts"

          "ffmpeg -y -i out-iter1.ts -acodec libfaac -vcodec copy out-iter2.ts"

          "ffmpeg -y -i out-iter2.ts -acodec libfaac -vcodec copy out-iter3.ts"

          "ffmpeg -y -i out-iter3.ts -acodec libfaac -vcodec copy out-iter4.ts"

          "ffmpeg -y -i out-iter4.ts -acodec libfaac -vcodec copy out-iter5.ts"

  My ffmpeg's version is 0.6.6. libfaac's version is 1.28.

  input.ts's audio duration is 10.432 seconds
  out-iter5.ts's audio duration is 10.56 seconds

  And I have also tried ffmpeg with version 0.11.
  And it makes the audio longer than the original input.

  So my question is : how to make sure the output's audio equals to the input's audio.
  Since libfaac will make the audio shorter, how can I compensate for it ?
  (For some reason I can't use -acodec copy directly.)

  Thank you for your help !

• PHP shell_exec wait for script to done ? [duplicate]

  6 mars 2016, par Melih Büyükbayram

  This question already has an answer here :

  • PHP shell_exec wait for script to finish ? [duplicate]
    
    1 answer
    

  I have a PHP script that queries a database for a list of jobs to be done and fires off other PHP scripts based on what it finds in the database (basically a process queue).

  Some of the scripts that the queue runner script executes may take 30 seconds or so to finish running (convert video, resizing images, etc).

  The problem is that shell_exec() in the queue runner script calls the processing scripts, but then doesn’t wait for them to finish, resulting in the queue not being completed.

  Queue runner script :

  #!/usr/bin/php
  
  <?php
  
      // Loop through database and find jobs to be done
  
      shell_exec("nohup $command > /dev/null 2> /dev/null & echo $! &");
  
  ?>

  Running the job script directly from the command line works and the PDF is created.

  Any ideas on how to fix this ? Or a better way to run a process queue ?