Want a 1-minute video delay

Just saw a diving coach with a dvd-ram recorder doing "time-slip" - the box
records in real time and plays on about a 30 second delay. This was a
_great_ system for coaching.

This box costs too much for me, I don't need to record, and I want at least
1 minute of delay.

Is there either a hardware or software solution?

jtaylor wrote:

> Just saw a diving coach with a dvd-ram recorder doing "time-slip" - the box
> records in real time and plays on about a 30 second delay. This was a
> _great_ system for coaching.
>
> This box costs too much for me, I don't need to record, and I want at least
> 1 minute of delay.
>
> Is there either a hardware or software solution?


It all amounts to storing this one minute.
Usually done with a harddisk.

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

jtaylor <(E-Mail Removed)> wrote:
> Just saw a diving coach with a dvd-ram recorder doing "time-slip" - the box
> records in real time and plays on about a 30 second delay. This was a
> _great_ system for coaching.
>
> This box costs too much for me, I don't need to record, and I want at least
> 1 minute of delay.
>
> Is there either a hardware or software solution?

I've done this using linux.
Mplayer/mencoder, encoding to mpeg.
Start mencoder recording to file, start mplayer 30 seconds later.
Plus, you can skip back and forward in the playback file.
One wrinkle is that you can fall off the end of the file, and it'll
exit.

Rene Tschaggelar <(E-Mail Removed)> wrote in message
news:40ea9034$0$26643$(E-Mail Removed)...
> jtaylor wrote:
>
> > Just saw a diving coach with a dvd-ram recorder doing "time-slip" - the
box
> > records in real time and plays on about a 30 second delay. This was a
> > _great_ system for coaching.
> >
> > This box costs too much for me, I don't need to record, and I want at
least
> > 1 minute of delay.
> >
> > Is there either a hardware or software solution?
>
>
> It all amounts to storing this one minute.
> Usually done with a harddisk.

Well, yes, that was obvious.

I've done some googling since posting; there are software video recorders
out there. Has anyone used one that has such a delay?

It's just ocurred to me that I might be able to start a video capture with
virtualdub or something similar, and just start a video file-player on the
capture file after 1 minute (or more). If I can get the file-player to read
the file even though it's in use that would work...

Ian Stirling <(E-Mail Removed)> wrote in message
news:%iwGc.3556$(E-Mail Removed)...
> jtaylor <(E-Mail Removed)> wrote:
> > Just saw a diving coach with a dvd-ram recorder doing "time-slip" - the
box
> > records in real time and plays on about a 30 second delay. This was a
> > _great_ system for coaching.
> >
> > This box costs too much for me, I don't need to record, and I want at
least
> > 1 minute of delay.
> >
> > Is there either a hardware or software solution?
>
> I've done this using linux.
> Mplayer/mencoder, encoding to mpeg.
> Start mencoder recording to file, start mplayer 30 seconds later.
> Plus, you can skip back and forward in the playback file.
> One wrinkle is that you can fall off the end of the file, and it'll
> exit.

Sounds good. What kind of cpu, ram, and disk space do you use?

This would have to run for about 1 hour of continuous video.

jtaylor <(E-Mail Removed)> wrote:
>
> Ian Stirling <(E-Mail Removed)> wrote in message
> news:%iwGc.3556$(E-Mail Removed)...
>> jtaylor <(E-Mail Removed)> wrote:
>> > Just saw a diving coach with a dvd-ram recorder doing "time-slip" - the
> box
>> > records in real time and plays on about a 30 second delay. This was a
>> > _great_ system for coaching.
>> >
>> > This box costs too much for me, I don't need to record, and I want at
> least
>> > 1 minute of delay.
>> >
>> > Is there either a hardware or software solution?
>>
>> I've done this using linux.
>> Mplayer/mencoder, encoding to mpeg.
>> Start mencoder recording to file, start mplayer 30 seconds later.
>> Plus, you can skip back and forward in the playback file.
>> One wrinkle is that you can fall off the end of the file, and it'll
>> exit.

I haven't checked more recent versions, it may be that the 'falling off'
has been fixed.
>
> Sounds good. What kind of cpu, ram, and disk space do you use?

I have a duron 1300, 256M ram (128 would be quite adequate) 800G or so
of disk (2 or 3 free would be adequate)

I wouldn't go much below duron 1300, 256M, 40G disk.
This is with 384*288 25fps encoding, 44Khz stereo 196K.
It uses 50% CPU, and is pretty stable.

> This would have to run for about 1 hour of continuous video.