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• How do you display things in the rails console for the user in Rails ?

  30 décembre 2014, par Swaathi K

  I am using Streamio-ffmpeg to process files. The gem shows the progress of the transcoding in the console. I want to display this progress to the user. Is there anyway of doing this ?

  This is my helper : (Where the transcoding is done)

  if myfile.filetype == "video"
  
          movie = FFMPEG::Movie.new(oldpath(myfile))
  
          movie.transcode(newpath(myfile),"-deadline realtime -aq 10 -qmax 25") { |progress| puts progress }
  
  
  
          FileUtils.rm_rf(oldpath(myfile))

  The { |progress| puts progress } is responsible for printing the progress to the console. Can I display this in my views instead ?

• Android and JNI, pipe data to FFmpeg

  2 décembre 2014, par William Seemann

  I’m trying to create a metadata retriever based on FFmpeg. Since raw Android application resources are often only accessible using a file descriptor I need a way to pipe this data to FFmpeg via JNI. I know FFmpeg supports a "pipe" protocol :

  UNIX pipe access protocol.
  
  
  
  Allow to read and write from UNIX pipes.
  
  
  
  The accepted syntax is: 
  
  
  
      pipe:[number]
  
  
  
  number is the number corresponding to the file descriptor of the pipe (e.g. 0 for stdin, 1 for stdout, 2 for stderr). If number is not specified, by default the stdout file descriptor will be used for writing, stdin for reading.
  
  
  
  For example: cat test.wav | ffmpeg -i pipe:0

  My question is, how do I programmatically emulate cat test.wav | ffmpeg -i pipe:0 using JNI and avformat_open_input using a FileDescriptor ? Is this possible ?

• ffmpeg use pipe fails with : Unable to find a suitable output format for 'pipe:1 :'

  2 mai 2019, par lin yuansen

  Using pipe protocol
  ffmpy can read input from STDIN and write output to STDOUT. This can be achieved by using the FFmpeg pipe protocol.

  The following example reads data from a file containing raw video frames in RGB format and passes it to ffmpy on STDIN ; ffmpy in its turn will encode raw frame data with H.264 and pack it in an MP4 container passing the output to STDOUT (note that you must redirect STDOUT of the process to a pipe by using subprocess.PIPE as stdout value, otherwise the output will get lost) :

  >>> import subprocess
  
  >>> ff = FFmpeg(
  
  ...     inputs={'pipe:0': '-f rawvideo -pix_fmt rgb24 -s:v 640x480'},
  
  ...     outputs={'pipe:1': '-c:v h264 -f mp4'}
  
  ... )
  
  >>> ff.cmd
  
  'ffmpeg -f rawvideo -pix_fmt rgb24 -s:v 640x480 -i pipe:0 -c:v h264 -f mp4 pipe:1'
  
  >>> stdout, stderr = ff.run(input_data=open('rawvideo', 'rb').read(), stdout=subprocess.PIPE)

  But the above code does not work for me.