title: Gstreamer video to pgm files
body: <p>I'm trying to save multiple files in RAW format (PGM) from a video source by using Gstreaamer. By reading thanks to the gst-inspect tool the differents sources and sinks available for the differents plugins that I use, I can't find the right way to achieve my goal. I use mfw_v4lsrc for the source video, ffenc_pgm to encode and filesink to save the file.</p>
  
  <p>this is my command line:
  gst-launch mfw_v4lsrc device=/dev/video0 name=source ! video/x-raw-yuv, width=250, height=250 ! ffenc_pgm ! filesink location=test.pgm</p>
  
  <p>I stay stuck with could not link source to ffenc_pgm.</p>
  
  <p>I'm able to obtain a live and save in jpeg. But for my goal, I need your help.</p>
  
  <p>Thanks</p>