Please describe the problem:
This makes y4menc useless for any file playback

Steps to reproduce:
0. mkfifo /tmp/test.fifo
0. modprobe vloopback pipes=3
1. gst-launch-0.10 filesrc location=somevideofile.avi ! decodebin ! ffmpegcolorspace ! videoscale ! video/x-raw-yuv, width=320, height=240 ! y4menc ! filesink sync=true location=/tmp/test.fifo
2. cat /tmp/test.fifo | mjpegtools_yuv_to_v4l /dev/video4
3. camstream

and view the video feed.


Actual results:
it goes very fast, as fast as the computer can transcode

Expected results:
The video to go at the normal rate.

Does this happen every time?
yes

Other information:
http://pastebin.ca/1421632 fixes it.