[gephex-devel] Fwd: yuv4mpeg from ffmpeg?

[Jay Thompson]

Hi everyone... I tried to post to the user list but it doesn't seem  
to be responding so I am forwarding my question to the development  
list. Please let me know if I shouldn't send my noob questions to  
this list.

Thanks,
jt

Begin forwarded message:

> From: Jay Thompson <jay at digitalhillbilly.ca>
> Date: August 7, 2007 2:22:07 PM PDT (CA)
> To: gephex-user at lists.gephex.org
> Subject: yuv4mpeg from ffmpeg?
>
> 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

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