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List:       mjpeg-users
Subject:    Re: [Mjpeg-users] Problems running lavrec
From:       Bernhard Praschinger <shadowlord () utanet ! at>
Date:       2007-12-26 11:04:25
Message-ID: 47723539.6080900 () utanet ! at
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Hallo

>>  From my guess you use a bttv based card ?
>> If you use a bttv based card, you need to use a command like that:
>> lavrec -f a -i p -g 352x288 -q 80 -R l --software-encoding test.avi
> lavrec -f a  -g 720x576 -s -q 80 -U -r 44100 -R l --software-encoding raw.avi
> Works, but with stuttering audio.  Audio is fine if I either drop the 
> resolution, go mono or reduce the sampling rate to 22000.
Have you tried lowering the resoution ?
For example to 480x576. But with full audio datarate ? If that works the 
problem is the "slow" CPU.

>> streamer can also create mjpeg encoded AVI's.
> Yes, but I am having trouble with that - it seems to use more cpu than lavrec 
> and just give up at some point.  Think I also had audio sync problems - just 
> having another go to confirm.
>  streamer -t 180:00 -r 25 -s 720x576 -o raw.avi -f mjpeg -F stereo
Haven't used streamer for a long time. so I can't tell.

> CPU usage it a little high at around 85% - on a 2.5GHz athalon.
That load is something about the expected. I think I had a similair 
level of load when I used it on my Athlon 2,13Ghz Athlon.

> Either solution would work well for me if I can caputure to something that 
> uses a bit less disk space than raw.  I can capute raw fine - its just that 
> the file sizes are a bit too large for comfort.
> 
> I'm wondering if I got something like this:
> 
> http://www.scan.co.uk/Products/ProductInfo.asp?WebProductID=318489
> 
> whether I could use the built in hardware encoder.  My existing card is 
> saa7134 based.  Not sure if hardware encoding can be done with that card.
No Idea. From the description you would get a MPEG2 Video. And that 
won't work with lavrec.

Many people use a a Analog -> FireWire box. Maybe the most common box is 
the  Canopus ADVC110. You would record DV using Kino: http://www.kinodv.org/

auf hoffentlich bald,

Berni the Chaos of Woodquarter

Email: shadowlord@utanet.at
www: http://www.lysator.liu.se/~gz/bernhard

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