[mythtv-users] RE:prv-250 capture settings and video quality

[jasonmiller at micron.com]

For what it's worth since no one actually answered Vinton's question, this is the relavant piece of ivtv-api.c:

        /* Initial settings */
        itv->v4l2.codec.bitrate		= 8000000;
        itv->v4l2.codec.bitrate_peak	= 16000000;
        itv->v4l2.codec.stream_type	= IVTV_STREAM_PS;

Change the bitrate to 4M and the bitrate_peak to 8M and recompile for roughly 2G/hr file sizes.

-----Original Message-----
From: Isaac Richards [mailto:ijr at po.cwru.edu]
Sent: Tuesday, May 20, 2003 9:25 PM
To: Discussion about mythtv
Subject: Re: [mythtv-users] RE:prv-250 capture settings and video
quality


On Tuesday 20 May 2003 10:46 pm, Vinton Coffman wrote:
> I switched the frame size to 720x480 and that did take care of the
> ghosts.  I bought some better cables too.
>
> I set the video quality to 50% but that doesn't seem to effect the bit
> rate.  Mythbackend  now reports
> Stream #0.0: Video: mpegvideo, 720x480, 29.97 fps, 16000 kb/s
> Stream #0.1: Audio: mp2, 48000 Hz, stero, 384 kb/s
>
> Now the average file size is ~3.8 GB/hour.
>
> Can someone post their settings or the procedure necessary to reduce
> the bit rate.  I was under the impression that people were getting
> about 2 GB/h with the pvr-250.  Can anyone with a 250 card verify this.

Everyone that's mentioned the default bitrate of the wintv-pvr cards has said 
it's set to VBR 8000 kbps (4GB/hour).  You're the only one that's (wrongly) 
said that they're 2GB/hour at the default bitrate.

There's stuff in the ivtv driver now to change the bitrate, but it's going to 
be changing sometime so it's not really worthwhile to support it yet.

Isaac
_______________________________________________
mythtv-users mailing list
mythtv-users at snowman.net
http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users