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• linux video loop : write to named pipe

  5 mars 2012, par puchu

  I am going to create funny video today :P. I am looking for utility that will loop video and write it to named pipe. I like ffmpeg to compress video that's why I am doing :

  mkfifo video.looped
  
  ffmpeg -i video.looped ...

  but how to write to this pipe looped video ? I found a very common solution :

  mencoder -o video.looped ... video video video ...

  and it works great. but is there something more comfortable ? something like :

  mplayer -fixed-vo -loop 5 video -dumpstream -dumpfile video.looped

  but this does not work. only first video went into pipe

• FFMPEG configuration for home video

  17 décembre 2015, par Andrey Soika

  I have a lot home video from my smartphone and from camera. But they take up much space. I want to compress/convert these in x264 files by ffmpeg.
  I find following config :

  ffmpeg -y -i input.mov -c:v libx264 -preset medium -b:v 4500k -pix_fmt yuvj420p -pass 1 -an -f mp4 nul
  
  ffmpeg -y -i input.mov -c:v libx264 -preset medium -b:v 4500k -pix_fmt yuvj420p -pass 2 -c:a aac -b:a 256k -f mp4 out.mp4

  Could you, please, help me improve these config to convert files with acceptable quality and small size.

• file already in use FFmpeg

  11 septembre 2018, par boandriy

  I am running a server that stores video files. When the file is uploaded I run the method below to compress it :

  private void compressVideo(String fileName) throws IOException
  
  {
  
       String cmd[] = {"location to my ffmpeg.exe","-y", "-i", 
  
                              "location to my inputfile"+fileName,"-vcodec","libx264","-crf","20",
  
                              "location to my output file"+fileName};
  
              Runtime.getRuntime().exec(cmd);
  
  
  
  }

  It works fine if my output fileName is different from input fileName.

  But when I run the program with the same names, FFmpeg clearly starts the process but it is not ended (after that I can’t open the overwritten file, it tells me that file is in use by FFmpeg).

  There is no error followed in the console.

  I have tried doing the same thing without running the server and it worked.

  As I am the beginner, I would like to know if I made any mistakes ?
  Any ideas how can I solve this problem ?

  Thanks in advance !