jason bright wrote:
If I go into the system settings and to the recording profiles and go to the DVB capture card, there are a pile of options - image size, codec (RTJpeg, MPEG4, etc), quality settings, etc etc.
Now correct me if i'm wrong, but isn't the DVB card supposed to just capture the raw MPEG transmission stream. So - why do we have these options? Do these parameters actually do anything?
The recording profiles aren't used for DVB. As you say, with DVB it just saves the raw MPEG stream.
To describe the problem - the output image just doesn't look as clean
as I remember using a dedicated DVB STB. I don't have one on hand to
compare directly but i'm going to borrow one for some tests. For
something like a newscast where the background is a reasonably
constant solid color there is quite a bit of jitter and crawling and
what looks like jpeg-y compression artifacts. 2001:A Space Odyssey
was on the other night and the black monolith around Jupiter looked a
real mess.
I believe there is a denoise filter in Myth, maybe you could try using that? Or play with the brightness/contrast and other settings for the channel. Try playing a recording in mplayer or xine and see if there is a difference? (Although I think they all use ffmpeg/libmpeg2 so they should be very similar).
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