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mpeg2 VOD field question

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Paul Allman
mpeg2 VOD field question
on Oct 21, 2005 at 7:16:28 pm

Hi -- I am creating mpeg2 transport streams to CableLabs specs. The specs call for upper field, but the source video is a combo of DVCPRO50 (lower field) and graphics. The question: does switching field dominance in Mpeg encoder damage image quality? Bit rate is 3.75. BTW, I have tested all encoders mentioned here (except Procoder) and I have gotten best results exporting mpeg2 directly out of QTPro(!).

Thanks in advance.



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Ben Waggoner
Re: mpeg2 VOD field question
on Oct 21, 2005 at 7:23:22 pm

I did exactly that project last week!

I used Carbon (pro-ProCoder), but I imagine ProCoder could do it just fine itself.


My Book: http://www.benwaggoner.com/books.htm
Squeeze and ProCoder tutorials: http://www.classondemand.net/benwaggoner/
Compression Class at Stanford: http://www.digitalmediaacademy.org/compression.html


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Paul Allman
Re: mpeg2 VOD field question
on Oct 21, 2005 at 8:01:44 pm

Hi Ben - does that mean the the field switching is a non-issue? I haven't seen any problems but I cannot preview on the VOD server. Best I can do is cook a dvd with source mpg and watch it that way.

I thought Procoder was PC only. I'll have to check it out.

thanks


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Ben Waggoner
Re: mpeg2 VOD field question
on Oct 21, 2005 at 8:16:08 pm

I believe the VOD spec can handle either field order. I've done my VOD in lower-field without a hitch.


My Book: http://www.benwaggoner.com/books.htm
Squeeze and ProCoder tutorials: http://www.classondemand.net/benwaggoner/
Compression Class at Stanford: http://www.digitalmediaacademy.org/compression.html


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