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Self Contained Quicktime-DVCPROHD 1080i question

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John Pale
Self Contained Quicktime-DVCPROHD 1080i question
on Jun 24, 2007 at 4:04:25 pm

I need to export some self contained Quicktimes for playback on another Kona 3 system.

I've noticed that exporting a self contained Quicktime of a 1080i DVCPRO-HD sequence results in a full raster frame size of 1920 x 1080 with square pixels, rather than the normal DVCPRO HD anamorphic frame size of 1280 x 1080, even though its still in the DVCPRO HD codec. If you place this Quicktime in a Kona DVCPRO HD Sequence you will have to render it, as it is the wrong frame size. (You can modify the sequence settings to 1280 x 1080 square, and not render, but if you have to mix with an existing sequence, its a problem).

If I export using Quicktime Conversion and the Apple DVCPRO-HD 1080 preset, it stays 1280 x 1080...though it takes much longer to export (indicates its being re-compressed). If I do this, am I losing quality?




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walter biscardi
Re: Self Contained Quicktime-DVCPROHD 1080i question
on Jun 24, 2007 at 4:08:02 pm

[John Pale] "I've noticed that exporting a self contained Quicktime of a 1080i DVCPRO-HD sequence results in a full raster frame size of 1920 x 1080 with square pixels, rather than the normal DVCPRO HD anamorphic frame size of 1280 x 1080, even though its still in the DVCPRO HD codec."

Have never seen this on our system when doing an Export > Quicktime Movie > Current Settings from a DVCPro HD timeline. It's always in the correct anamorphic frame size, either 960x720, 1280x1080 or 1440x1080.

Be sure you're not editing in a ProRes timeline.

Walter Biscardi, Jr.
http://www.biscardicreative.com
HD Editorial & Animation for Broadcast and independent productions.

All Things Apple Podcast! http://cowcast.creativecow.net/all_things_apple/index.html

Read my blog! http://blogs.creativecow.net/WalterBiscardi


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John Pale
Re: Self Contained Quicktime-DVCPROHD 1080i question
on Jun 24, 2007 at 6:50:13 pm

Not using Pro Res. (can't use Pro Res at all, even for playback, on my ancient Dual 2GHZ G5) :)

Everything created using the AJA Easy Setup for 1080i/29.97 DVCPRO HD.

Hmm.. Very odd. Thanks for helping me figure out its not normal.


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John Pale
further investigation
on Jun 24, 2007 at 8:17:16 pm

Using the old Avid trick of narrowing down the timeline, I found that the presence of a number of clips in the opening tease caused the export to be done at 1920 x 1080 instead of 1280 x 1080. The crazy thing is all the footage reads in the browser as DVCPRO HD 1280 x 1080....there is no Uncompressed HD footage in the project.

Adding the Broadcast safe filter to the entire tease and forcing a render causes the export to be done correctly, as the sequence now refers to render file instead of the original footage...which must have some weird header corruption.



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walter biscardi
Re: further investigation
on Jun 24, 2007 at 8:40:14 pm

That is a strange one. Thanks for the follow-up!

Walter Biscardi, Jr.
http://www.biscardicreative.com
HD Editorial & Animation for Broadcast and independent productions.

All Things Apple Podcast! http://cowcast.creativecow.net/all_things_apple/index.html

Read my blog! http://blogs.creativecow.net/WalterBiscardi


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