[mythtv-users] Advice on getting best archive quality?
myth at dermanouelian.com
Fri Feb 29 22:11:34 UTC 2008
On Feb 29, 2008, at 1:58 PM, Corey Wirun wrote:
> Hi All,
> I'm trying to improve video quality when I archive to DVD. My
> recordings are grainy with motion-related artifacts that appear.
> I'm using the removecommercials scripts that is on the net. I
> could use a little advice here on how to get TV quality recordings
> on disk.
> What I do not understand is the the script (run as a user job) takes
> a 2.2Gig recording and puts it down to 750K. Is this where the
> initial quality loss is? I understand that the script flags the
> commercials then transcodes the result to a smaller file.
> Marginally smaller I can understand due to the loss of commercials,
> but what is actually reducing the file size by 65%? Different format?
> Also, is the quality degrading even further because I'm trying to
> burn 6 hours of programming on a DVD? If I want near-TV quality,
> how much recording capacity can I expect on a 4.7Gig DVD?
> I have a PVR-350 and I record using a recording profile with:
> Image size: 720x480
> Video Codec: MPEG-2
> Stream type: MPEG-2 PS
> Aspect: 4:3
> Bitrate: 4500
> Max Bitrate: 6000
You can try bumping this up if you notice compression artifacts in
your original recordings. I know at this level my blacks looks very
blocky and it bugs me so I push this a bit higher.
> Audio Codec: MPEG-2 Hardware Encoder
> Sampling: 32000
> Type: Layer II
> Bitrate: 384kbps
You're recording in a DVD-compliant resolution and format so there's
no need to re-encode anything. You can add cutpoints and use the mpeg2
-> mpeg2 profile which should just cut and not re-encode the video (in
a matter of seconds) and then just set up the archive job to not re-
encode and you will have a DVD at whatever quality your original
I know the mpeg2->mpeg2 encoder has issues at some point, but I think
it's working now. I'm sure someone will correct me if I'm wrong in any
of this. :)
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the mythtv-users