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• ffmpeg to make black video with multiple audio and subtitles [closed]

  9 septembre 2024, par Tony M

  I want to use ffmpeg to make a video with only audio and subtitles in different languages. The video part can be a simple black background. I want to be able to switch between languages in video players like QuickTime.

  


  I've tried to get help from posts like this, but I couldn't figure out how to get it to work.

  


  To demonstrate that I've worked a long time on this, I'm showing what I've come up with below — but only steps (1) & (2) work. I can't get the subtitles step (3) to work.

  


  I've used ffmpeg for a long time, but never really understood it... I've only recently started to build my own commands, so the following probably looks awful to an expert :

  


  


  1. make a silent video using

     


     ffmpeg -loop 1 -i black.jpg -i silent.mp3 -acodec copy -shortest -vf scale=1000:136 silent.mov

     


  


  


  where m.jpg is a 500x68 black image and m.mp3 has 5 min of silence

  


  


  2. add 3 language (italian, french, german) using

     


     ffmpeg -i silent.mov -i ita.mp3 -i fre.mp3 -i ger.mp3 -map 0:v -map 1:a -map 2:a -map 3:a -metadata:s:a:0 language=ita -metadata:s:a:1 language=fre -metadata:s:a:2 language=ger ita-fre-ger.mov

     


  


  3. add subtitles using (doesn't work)

     


  


  


  ffmpeg -i ita-fre-ger.mov -i ita.srt -i fre.srt -i ger.srt -map 0 -map 1 -map 2 -map 3 -c copy -c:s mov_text -metadata:s:s:0 language=ita -metadata:s:s:1 language=fre -metadata:s:s:2 language=ger final.mov

  


• Piping via FFMPEG make loose file duration

  26 juillet 2018, par Megaman

  In order to dynamically encode file and upload them to a server, I output ffmpeg to pipe:1 and use curl to post the result to a file.

  The problem is when I use MediaInfo to check the file, it appears as ’Open / Incomplete’ and the duration is no longer available. Is there a solution to make the piping properly closing the file ?

  I have also pipe locally the output to check if it is related to the upload, but the problem is still there.

  Here is my command :

  ffmpeg -i myFile.mxf -vcodec copy -filter_complex "[0:1:a]channelsplit[left1][right1];[left1]asplit=1[a1];[right1]asplit=1[a2]" -map 0:v:0 -map "[a1]" -map "[a2]"  -c:a:0 pcm_s24le -b:a:0 1152k -ar:0 48k -c:a:1 pcm_s24le -b:a:1 1152k -ar:1 48000 -f mxf pipe:1 > myFile_ff_pipe_local.mxf

  Thanks in advance \m/

• Grab frame without downloading whole file ?

  12 janvier 2012, par Writecoder

  Is this possible using php + ffmpeg ?

  ffmpeg-php has the ability to :

  Ability to grab frames from movie files and return them as images that
  can be manipulated using PHP's built-in image functions. This is great
  for automatically creating thumbnails for movie files.

  I just don't want to download the whole file before doing so.
  So lets say i want to grab a frame @ 10% of the movie :

  First lets get the size of remote file :

  $ch = curl_init(); 
  
  curl_setopt($ch, CURLOPT_HEADER, true); 
  
  curl_setopt($ch, CURLOPT_NOBODY, true);
  
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); 
  
  curl_setopt($ch, CURLOPT_URL, $url); //specify the url
  
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); 
  
  $head = curl_exec($ch);
  
  
  
  $size = curl_getinfo($ch,CURLINFO_CONTENT_LENGTH_DOWNLOAD);

  Then it's quite easy to download only 10% of the .flv or .mov file using curl.

  But the framegrab trick using ffmpeg-php probably won't work because the file probably is corrupted ?

  Any other ideas ?