On Thursday 05 June 2008 05:25:44 Bryan Henderson wrote:
> Thanks.
>
> I'm not using MythTV. I'm just reading from the IVTV device.
>
> So one chooses the output bit rate and the PVR-250 adjusts the
> compression to achieve it?
>
> Since you mention it, I see IVTV has a codec parameter "bitrate" and
> for me (default, apparently), it is 8 million. Assuming that's bits
> per second, that's pretty close to the amount of data I'm getting
> out.
>
> I wonder if there's a way to set constant quality and let the amount
> of data generated vary with the compressibility of the input.
No, it's not in the MPEG standard. I guess this is to prevent very high
bitrates that decoders cannot handle. Also note that the default ivtv
settings are pretty good. There is very little to be gained when you go
to higher bitrates. It's only PAL/NTSC resolution after all.
The current default settings are: variable bitrate, average bitrate of
6000000 bits per second, max peak bitrate 8000000.
Regards,
Hans
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