[mdlug] Raspberry Pinewood Derby

[Ingles, Raymond]

Just for completeness, here's the command line I was using to record the video:

     ffmpeg -f video4linux2 -input_format yuyv422 -i /dev/video0 -vcodec copy output.mkv

The camera's native format, so far as I can tell, is "YUV2" or "YUYV 4:2:2" - hence the input format param.

Before that, I'd set up the camera for the correct format:

    #    Set resolution
    v4l2-ctl --set-fmt-video=width=320,height=240
    #    Set frames per second
    v4l2-ctl --set-parm 75

And, to play it, a little shell script:


    #!/bin/sh

    FPS=${1:-15}

    mplayer -vc rawyuy2 -fps $FPS output.mkv

Note, that if it got an arg, it would use that as the desired fps value. If no arg, it would default to 15 fps.

If anyone has any tips or suggestions for how to improve this, in particular how to get more FPS out of it, I'd be interested.
________________________________________
From: mdlug-bounces at mdlug.org <mdlug-bounces at mdlug.org> on behalf of Ingles, Raymond <Raymond.Ingles at compuware.com>
Sent: Tuesday, March 04, 2014 1:42 PM
To: MDLUG's Main discussion list
Subject: Re: [mdlug] Raspberry Pinewood Derby

> From: Mat Enders
> you could hook the pi up to a holding physical switches on a teeter along with something on the start line and capture all of the times

That's my basic plan. Probably some kind of electric eye. The Pi takes a little under two seconds to wind up and actually start recording, but the runs take about three seconds so that should be enough time.

I didn't get a chance to pull the scripts last night but I'm actually curious to see what improvements people might recommend. Really, it's just the command line to ffmpeg that's the key. The rest is just setting a few video4linux2 parameters and playing the resulting file.

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