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• FFmpeg : Audio Filter taking too long

  29 novembre 2018, par Prashant_Sarin

  I am using the code below to apply a volume filter in ffmpeg, but it is taking too long. A 5-minute audiofile filter takes 3 minutes. Can someone give advice on how I can speed it up.

  My command is :

  var command = "-i $audioPath -af volume=enable='between(t,5,10)+between(t,15,20)':volume=0.25:eval=frame $outputFile"

  Logs are :

  2018-11-29 16:58:22.487 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress -    ---AudioVolume---- size=    1537kB time=00:01:40.41 bitrate= 125.4kbits/s speed=1.13x    
  
  2018-11-29 16:58:22.489 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- video:0kB audio:1518kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.260607%
  
  2018-11-29 16:58:22.490 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- bench: utime=86.707s
  
  2018-11-29 16:58:22.491 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- bench: maxrss=65792kB
  
  2018-11-29 16:58:22.492 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- [aac @ 0xb1ce4400] Qavg: 17415.965 
  
  2018-11-29 16:58:22.493 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: AudioVolume success--------- -benchmark -threads 4 -i /storage/emulated/0/FFmpegTest/looped.m4a -af volume=enable='between(t,5,10)+between(t,15,20)':volume=0.25:eval=frame 
  
  /storage/emulated/0/FFmpegTest/filtered_audio.m4a

• ffmpeg-php module fails in linux

  26 juillet 2017, par Swati

  I’ve been trying this for a couple of days now. I am trying to install ffmpeg-php on my CentOS server.

  OS : CentOS 6
  PHP : 5.5
  ffmpeg : 1.2.1
  ffmpeg-php : 0.6.0
  The ffmpeg installation went on without a hitch and I am able to convert files back and forth via the CLI.

  While installing ffmpeg-php, I encountered errors while making (after configuring) due to time.h references which was corrected by renaming the files creating with an extension .loT to .lo (as rightly pointed out here)

  Once this was done, the make process went on smoothly and the make install went through without a hitch. However, after specifying the extension=ffmpeg.so in the php.ini file and after restarting Apache, the module doesn’t load or show up in phpinfo().

  The Apache error log shows only "PHP Warning : PHP Startup : Invalid library (maybe not a PHP library) ’ffmpeg.so’ in Unknown on line 0" and nothing else.

  make test also shows the same error and FAILS the associated tests. I’ve checked here which wasn’t very helpful. Also, I read somewhere that it may be the issue with permissions but the permissions for the ffmpeg.so file is 755.

  Any help is appreciated.

  Thanks in advance.

• how to reduce output size while capturing webcam video using ffmpeg ?

  27 novembre 2014, par Chris Snow

  I am capturing output from my webcam as follows :

  ffmpeg -y -an -vcodec rawvideo -f video4linux2 -s 320x240 -i /dev/video0 out.mpg

  I would like to trade off quality of the output in order to reduce the amount of data that is recorded but I don’t know what options to set.

  Any pointers will be appreciated - video encoding is a completely new area and unknown area of computer science for me.