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• PHP large video upload converting to mp3 by ffmpeg

  27 mai 2017, par SuperBerry

  I am working on a project on Linux VPS (Apache + PHP5, 4G RAM / 2 CPU Cores) which allows users to upload videos (200M max) and convert to MP3 audio files by FFMPEG. I have few questions about the concurrency and the processing because I am a newbie on PHP :

  1. If there are 10 visitors uploading (1 visitor uploads one 200M MP4 file), will it cost 2,000M memory of the server ? Will the chunk upload method could solve this memeory issue while more visitors uploading videos at the same time ?

  2. I am going to use Redis to manage the ffmpeg processing queue, and set the crontab. Should I use the shell_exec() to call the ffmpeg to process the conversion at background, then convert the uploaded videos one by one ?

  The uploading and conversion is the most cost for the server I think... Maybe my idea is extremely crazy...I am new to this type of service.. I didn’t make online projects before, just desktop apps...

  Thanks a lot for your help..

• Unable to overwrite ffmpeg metadata

  11 décembre 2019, par underscore

  I am having some issues overwriting the metadata on video files using FFmpeg that already has metadata added to it previously(previous metadata also added by FFmpeg).

  So I am using ffmpeg -i path/to/video file -i /path/to/metadata -map_metadata 1 -codec copy path/to/output file to merge the metadata file with the video file but if the video file has already been through this command once the new metadata won’t stick, only the old ones remain. Is there a way of forcing the metadata to be overwritten by the new metadata file ?

  Most of what I have tried so far have only been making a metadata text file from scratch to see if there were some issues with the metadata I was extracting from the video file using ffmpeg -i path/to/video file -f ffmetadata path/to/metadata.
  So far I haven’t been able to find a lot about this online other than variations on this command, however, I think that is mostly due to the fact that I am not entirely sure what keywords I should search for.

  Thanks for the read

• video orientation detection in bash

  30 décembre 2014, par Miati

  I need to detect whether videos are recorded in portrait or landscape mode, then transpose those into the correct orientation, in a scripted fashion.

  if [ "$v_orient" ==  "landscape" ]
  
    then
  
      ffmpeg -i file.mp4 -vf "transpose=1" file.ogv
  
    else 
  
      ffmpeg -i file.mp4 file.ogv
  
  fi

  I’ve looked in ffmpeg online documentation and googled around,

  I’ve attempted exiftool

  exiftool -Rotation -Rotate file.mp4

  However, this outputs Rotate : 90 for both landscape & portrait videos I have.

  ---

  How can I detect the video orientation in bash ?