Newest 'ffmpeg' Questions - Stack Overflow

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• How to remove specific duration from video using ffmpeg

  31 mars 2017, par Fidona

  i've tried many ways to solve the problem, i also tried this code before

  ffmpeg -i movie.mp4 -vf trim=3:8 cut.mp4
  

  but for the result, the audio is still there but the video is gone. all i want is the video and audio both are removed. can anyone help me how resolve this?

• Combine A Video Only and a aac audio as fast as possible with ffmpeg or anything else

  31 mars 2017, par Bubun

  I want to combine a video (without audio), and a .AAC encoded audio file together as fast as possible. I don't want to convert anything, I just want to combine the both video and audio in a single playable file.

  Here is what I tried:

  First downloaded the video and it's audio files

  And save them in a folder and combine both with ffmpeg.

  The problem is, this is taking too much time. Please answer if you have​ any other way to do it, but please keep in mind that we need to use PHP for the job done.

• iframeextractor complied error using FFmpeg 3.2.4

  31 mars 2017, par asdemon

  I compile the FFmpeg-iOS using the script from https://github.com/kewlbear/FFmpeg-iOS-build-script

  when I add the compiled .a file to the iframeextractor project, it appear such errors:

  Undefined symbols for architecture i386: "_kVTProfileLevel_H264_Main_5_1", referenced from: _vtenc_init in libavcodec.a(videotoolboxenc.o) "_kVTProfileLevel_H264_Main_4_2", referenced from: _vtenc_init in libavcodec.a(videotoolboxenc.o) "_kVTProfileLevel_H264_Main_4_1", referenced from: _vtenc_init in libavcodec.a(videotoolboxenc.o) "_kVTProfileLevel_H264_Main_3_1", referenced from: _vtenc_init in libavcodec.a(videotoolboxenc.o) "_kVTProfileLevel_H264_Main_3_0", referenced from: _vtenc_init in libavcodec.a(videotoolboxenc.o) "_CMSampleBufferGetDecodeTimeStamp", referenced from: _vtenc_frame in libavcodec.a(videotoolboxenc.o) .... ld: symbol(s) not found for architecture i386

  I search some where and add compile flag -libiconv and add libz.dylib，libbz2.dylib，libiconv.dylib, but the error goes on

  Is there some help?

• [PHP]Combine A Video Only and a aac audio as fast as possible with ffmpeg or anything else

  31 mars 2017, par Bubun

  I wanna Come a video (Without Audio), And a .AAC encoded audio file together as fast as possible. I don't want to convert anything, I just wanted to combine the both video and audio in a single playable file. Here is what I exactly trying: First downloaded the video and it's audio files And save them in a folder and combine both with ffmpeg But the problem is this is taking too much time Please answer if you have​ any other way to do it,

  But please keep in mind that we need to use PHP for the job done.

• Reduce FFmpeg CPU Usage with cpulimit and PHP

  31 mars 2017, par Matt McManis

  I run FFmpeg on my server using PHP exec().

  It currently uses 100% of the cpu thread while encoding.

  I followed this gude that uses a program called cpulimit to reduce it to 30%.

  ---

  PHP

  $args = "nice -19 cpulimit -l 30 -- ffmpeg -y -i intput.avi -vcodec libx264 -acodec aac -b:a 192k -threads 1 output.mp4"
  exec(escapeshellcmd($args));
  

  FFmpeg/PHP works, and it will work with nice/cpulimit through the terminal, but after adding
  nice -19 cpulimit -l 30 -- to the PHP script it no longer works with exec().

  ---

  Output

  FFmpeg output returns blank. I'm not able to see the full output, I tried using:

  $output = shell_exec($args);
  echo "
  $output
  "
  

  and

  file_put_contents("/var/www/mysite/logs/$output.log", $line . PHP_EOL, FILE_APPEND);
  

  But they return 1 empty line.

  ---

  Solution

  My thought is that www-data runs FFmpeg and nice/cpulimit may need root?

  How can I get PHP exec() to work with FFmpeg args and cpulimit?

  Or is there an alternative way to limit the usage %?