Recherche avancée

Sur d’autres sites (5667)

• Have 2 blocking scripts interact with each other in linux

  18 novembre 2014, par Ortixx

  I have 2 blocking shell scripts which I want to have interact with each other. The scripts in question are peerflix (nodejs script) and ffmpeg (a simple bash script).

  What happens : Peerflix fires up, feeds data to ffmpeg bash scrip which terminates peerflix on completion.

  So once peerflix starts it outputs 2 lines and blocks immediately :

  [08:15 PM]-[vagrant@packer-virtualbox-iso]-[/var/www/test]-[git master] 
  
  $ node /var/www/test/node/node_modules/peerflix/app.js /var/www/test/flexget/torrents/test.torrent -r -q
  
  listening: http://10.0.2.15:38339/
  
  process: 9601

  I have to feed the listening address to the ffmpeg bash script :

  #!/bin/sh
  
  ffmpeg -ss 00:05:00 -i {THE_LISTENING_PORT} -frames:v 1 out1.jpg
  
  ffmpeg -ss 00:10:00 -i {THE_LISTENING_PORT} -frames:v 1 out2.jpg

  After the bash script is done I have to kill the peerflix script (hence me outputting the PID).

  My question is how do I achieve this ?

• AIR to ffmpeg via argb frames transfer

  4 mai 2014, par mika

  Hey I’m running into a similar problem as : Converting RGB to YUV, + ffmpeg

  From AIR, I figured the encoding was too long to render frames at a reasonable rate - so I exported the argb ByteArray from bitmap.getPixels(rect) directly to a file.

  So for a 30sec flash animation, I’d export let’s say 1500 frames to 1500 .argb files.

  This method works great. I was able to render HD video using the ffmpeg cmd :

  ffmpeg -f image2 -pix_fmt argb -vcodec rawvideo -s 640x380 -i frame_%d.argb -r 24 -qscale 1.1 -s 640x380 -i ./music.mp3 -shortest render-high.mpg

  So far so good ! However, inbetween the two processes we need to store those 3gb of data.

  I then tried to append all the argb to one single file and have ffmpeg consume it, but didn’t get anything good out of it... Also tried messing tcp/udp but getting stuck...

  Does anyone know of a way to streamline that process and hopefully pipe both Air and ffmpeg together ?

• How to specify the exact number of output image frames with ffmpeg ?

  14 novembre 2020, par Miloslav Číž

  I have N input animation frames as images in a folder and I want to create interpolated inbetween frames to create a smoother animation of length N * M, i.e. for every input frame I want to create M output frames that gradually morph to the next frame, e.g. with the minterpolate filter.

  


  In other words, I want to increase the FPS M times, but I am not working with time as I am not working with any video formats, both input and output are image sequences stored as image files.

  


  I was trying to combine the -r and FPS options, but without success as I don't know how they work together. For example :

  


  

  • I have 12 input frames.

  


  • I want to use the minterpolate filter to achieve 120 frames.

  


  • I use the command ffmpeg -i frames/f%04d.png -vf "fps=10, minterpolate" -r 100 interpolated_frames/f%04d.png

  


  • The result I get is 31 output frames.

  


  


  Is there a specific combination of -r and FPS I should use ? Or is there another way I can achieve what I need ?

  


  Thank you !