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• Looking for an idea for batch processing of sound and subtitles

  21 décembre 2020, par yan chen

  I want to add commentary and subtitles to more than 10 videos.
For the commentary copy of each video, I use a script to convert the text into a voice mp3 file.
I manually create a subtitle srt file for one of the videos.
I Can successfully synthesize video, voice mp3 and subtitles through FFMPEG, but there are many video files, each of which is time-consuming to manually create srt files.

  


  I have tried to use a script to automatically generate a text every 3 seconds, but the sound and subtitles are not synchronized.

  


  I googled for more than an hour, but I didn’t find a solution to automate the production of subtitles. Can someone provide me with some ideas ? Thank you

  


• Creating a movie from multiple .png files

  21 octobre 2014, par QuantumFool

  I’ve got quite a few .png files, and I need to create a movie out of them. So, I’m going through this tutorial which uses ffmpeg :

  http://www.miscdebris.net/blog/2008/04/28/create-a-movie-file-from-single-image-files-png-jpegs/

  When I go to type the first line (sudo apt-get install ffmpeg), in Terminal and enter my password as appropriate, I get :

  Reading package lists... Done
  
  Building dependency tree       
  
  Reading state information... Done
  
  Package ffmpeg is not available, but is referred to by another package.
  
  This may mean that the package is missing, has been obsoleted, or
  
  is only available from another source
  
  
  
  E: Package 'ffmpeg' has no installation candidate

  That’s funny ; I installed the latest version manually this morning ! Anyway, I proceed with the instructions assuming ffmpeg is installed properly (I’m looking at the file where it downloaded to, so that can’t be the issue) :

  cd Downloads
  
  cd python-meep
  
  cd Images
  
  ffmpeg -qscale 4 -r 20 -b 9600 -i Image%03d.png movie.mp4

  To my surprise, I get :

  ffmpeg: command not found

  I just installed it ! Furthermore, I dragged my manual installation folder into the very same directory with the pictures ! What’s going on ?

  Thanks !

• FFmpeg API : parse raw movie packet data into AVPacket

  7 novembre 2011, par Andrea3000

  If you have a movie file and you need to extract frame (packet) from it, it's simply a matter of writing :

  avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);
  
  
  
  ...
  
  
  
  AVPacket packet;
  
  av_read_frame(formatContext, &packet);

  But what if I don't have the movie file but only unparsed, raw packet data ? These raw packet data are the same as the raw data contained into the movie file but I don't access them throught avformat_open_input and therefore I can't use av_read_frame so FFmpeg doesn't parse them.

  How can I parse this raw data in order to build the corresponding AVPacket ?
  I need to obtain an AVPacket identical to the ones provided by av_read_frame.