On Tue, 23 Mar 2004, Matto Marjanovic wrote:
> You want to take the 'other' lines from the 2nd frame....
Ok - that's what another reply I received mentioned. Thought was,
initially, one would want the 0,2,4 (or 1,3,5) from both.
> If you go (0,2,4,...) followed by (1,3,5,...), you will create a
> Top-Field-First stream. Vice-versa, it's Bottom-Field-First.
Right - that much I managed to get right as it turns out ;)
> Be careful: this doesn't work on the chroma channels of 4:2:0 streams.
Sigh, nothing's simple is it?
> to a pair of (un-subsampled) lines from different fields. You need to
> get rid of the vertical subsampling first before splitting each frame
> up into fields (e.g. convert to 4:2:2).
And y4mscaler can do the 420 to 422 conversion so, ok, might not be
impossible to do with the tools at hand and the y4minterlace (which
just needs to be tweeked to deal with (or insist upon) 422).
> ps: Hmm, I should add something like this to y4mscaler; right now it
> just bails when facing such a task.
y4mscaler 0.7? ;)
In case you're curious why one would want to go thru this process...
ABC (channel 7 in Los Angeles) broadcasts its HDTV content in the
[EMAIL PROTECTED] format. No, I don't have a capture card that can
deal with that - I've something even better in the works. Apple's
Firewire SDK has the ability to appear as a Virtual D-VHS deck over a
IEEE1394 connection. All I need (and it's been ordered - should
arrive Friday) is a HDTV tuner with a IEEE1394 port on it. Converting
the captured transport stream, etc is easy - but what's needed is
a way to interlace to something that can be put on a DVD. Obviously
the 1920x1080i format doesn't need the interlacing step ;)
> pps: I should also check-in the "YUV4MPEG2, version 3" code I wrote
> two/three weeks ago; hopefully by Sunday.
Wheee - any expected breakage you want to warn about?
Cheers,
Steven Schultz
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