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  1:1 OMF Conform vs Transcode from DNxHD 36

  Posted by Adam Recht on September 5, 2008 at 1:23 pm

  So I’m offlining this HD show using the DNxHD 36 codec (which is great).

  I’ve to deliver a “broadcast quality” trailer on PAL Digibeta for the execs to admire (not actually for broadcast).

  My question is, can I get away with just transcoding the DNxHD sequence over to 1:1 OMF, or do I have to do it the proper way of reconforming from the HD rushes into an SD project, using the SD downconvert output from the deck? (The camera originals are HDCam SR, 1080p25)

  I’ve done a quick test and to be honest they both look pretty bad to me – I wonder if this is the Mojo DX not doing a great job of uprezzing the SD signal to its HDMI output (which is how the monitor’s hooked up), or whether I’ve just been spoiled by looking at only HD pictures for the last few weeks?

  Any wise words or advice would be greatly appreciated…

  Adam Recht replied 17 years, 9 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Michael Phillips

  September 6, 2008 at 2:25 am

  I would get an SD monitor to do the final check. I have seen HD monitors display SD petty well and others that just look like crap. In theory, the decode from HD with SD down convert via deck should look better as it has gone to a rather compressed format like DNxHD 36 (which looks great, I agree).

  But – how much worse or better is what will make your final decision. Export a TIFF file from the uncompressed SD for the same frame from both processes and compare the two… how much different do you see?

  Michael

  Michael Phillips
• 

  Adam Recht

  September 13, 2008 at 3:03 pm

  That is a very clever suggestion. Thank you,

  Having done so, the difference is almost imperceptible — the reconformed 1:1 is very very slightly sharper but it’s so close as to make virtually no difference, IMHO.

  Your mileage may vary…

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