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• add a part of an audio file to a certain part of video , in loop using FFmpeg

  5 octobre 2017, par 1234567

  I have two files one Audio and one video file,

  The audio file is 1 min long,

  and the video file is 2 min 30 sec long,

  I want to add a part of audio, with loop not the whole audio file to the video , using FFmpeg

  say from 15 sec to 33 sec of the audio file

  to a part of video say from 45 sec to 1min 30 sec

  this code has worked with a single file which is 18 sec long , which is added to a certain part of video with a loop

  "-y","-i",j,
  
                          "-filter_complex",
  
                          "amovie="+audio+":loop=999,asetpts=N/SR/TB," +
  
                                  "atrim=0:45,adelay=45000|45000,aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=1.5[a1];" +
  
                                  "[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=2.0[a2];" +
  
                                  " [a1][a2]amerge,pan=stereo:c0code>

  the problem is If I have a 1 min long audio file and just want to extract a 18 sec part form it , and add it to video in a loop how can that be done

• ffmpeg does not respect FPS when using -f segment option

  29 juin 2021, par trycatch22

  I am creating a dashcam library where video files are written constantly to 2 buffers. When an event happens, the most recent buffer is returned. Everything works fine except when I try to customize the FPS, I see inconsistent behavior.

  


  This is the ffmpeg command I use :

  


  ffmpeg -y -i rtsp://admin:admin@192.168.1.200 -f segment -segment_time 3 -segment_wrap 2 out_%d.mp4


  


  This works as expected and constantly spits out 2 three second files - out_0.mp4 & out_1.mp4. The default FPS of the streaming device is 100. When I add the fps parameter like so :

  


  ffmpeg -y -i rtsp://admin:admin@192.168.1.200 -f segment -segment_time 3 -segment_wrap 2 -r 60 out_%d.mp4


  


  I see that one or both the files are 4s long and all the frames are the same. When I drop the FPS to 30, the files are at least 8s long.

  


  What am I doing wrong ? How can I ensure that the dumped video files are valid and as long as it is specified by -segment_time

  


• Virtual host compared to multiple servers

  9 septembre 2011, par josiecat

  This may be dumb but has me wondering why and I know how to setup the virtual host but need to know the why or what it is good for.

  Why do you setup virtual host for local development and why not just put sub directories ?

  What are the real world uses and how do you use virtual host ?

  (my normal set up as of now)
  I use Mamp and just put more folders (speaking dummy terms here) in the htdocs folder. Is that ok what am I missing ?

  The reason why I would like to use virtual hosting is because I would like to have a few servers to try different technologies (e.g. adding ffmpeg support for streaming video and many others ) but do I use virtual hosting to be able to have more than one server or do I need to use something like virtual machine to have multiple servers with different versions of PHP, Mysql etc...?

  I understand how to set this stuff up just don't understand the difference from virtual host to multiple servers ? could I actually set up one with php just the basic and another for php with ffmpeg-php and other stuff like zend or what ever just to have different server environments to basically mock the actual server that the project will land when done ?