[gephex-user] yuv4mpeg from ffmpeg?

[Jay Thompson]

Hi All... I posted originally to the devel list accidently but it's  
probably better if I use the user list. I've been trying to find a  
way to get a live signal from my DV camcorder into Gephex. I've been  
making progress using ffmpeg but also had trouble getting it to read  
the camera. So now I am using dvgrab piped to ffmpeg and that seems  
to work well. If I write to a MP4 the process soaks up about 15% of  
my cpu and writing to YUV takes up about 6% (combined dvgrab and  
ffmpeg). Both are acceptable.

What I'm trying to accomplish is a yuv4mpeg stream from ffmpeg that  
Gephex can read. It seems ffmpeg will do this but I'm going in  
circles and could use some advice. I've read many things on the web,  
man pages, readme's, etc... but am missing something. Does the Gephex  
yuv4mpeg module read from a fifo file or is the stream piped from  
ffmpeg to Gephex? The Gephex y4m module won't even see any of my  
mkfifo files. With other attempts Gephex just shows a green screen -  
I probably need to convert the video from 4:1:1 to 4:2:2 or 4:2:0 er  
something. This doesn't really matter at this point because mostly I  
get unrecognized header errors.

To be a little more concise - To get a yuv4mpeg stream into Gephex  
from ffmpeg:
Do I use a pipe or a fifo?
How would I create a pipe or fifo from ffmpeg that Gephex will read.

Thanks!
jt