DV Recompression on Render to NTSC DV?

JLK wrote on 10/14/2001, 10:56 AM
I have a question about DV and rendering a final video for printing back to tape in VV2h, which I recently purchased. Using Vidcap 2.5 I capture several clips from my D8 camera via Firewire. All clips are now in raw DV format on my hard drive. After editing, and adding transitions and simple titles, I render as NTSC DV for final output, hopefully without any additional compression added to the DV video, which is already compressed 5:1 by the D8 camera.
My question is, when the final file is rendered, is additional compression performed to all video, or just the titles and transitions? The manual illustrates an option for checking "if possible don't recompress frames" under advanced custom settings for final output (page 285), but this option does not seem to be available in version 2h. Will I have to choose "uncompressed" as an option to avoid recompression on final render? Thanks in advance for clearing this up.

Comments

HPV wrote on 10/14/2001, 3:51 PM
>>My question is, when the final file is rendered, is additional compression performed to all video, or just the titles and transitions?
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Just titles, transitions & filters. Sometimes you will want to force a render to clips if they are overexposed. Otherwise MS DV codec will clamp the bright areas right at the start or end of a transition. Same for titles and filters (FX) that don't last the duration of the video clip. I use the broadcast colors filter to force a render when needed.
The MS DirectX ver8 DV codec is not perfect but you won't have to worry much about loss from recompression. I see a very slight green tint on the first render. Anyone can see this by pausing playback, outputting to OHCI with recompressed edited frames selected and checking and unchecking a filter. Filter settings should be set to none so it doesn't influence the image, just force the recompression.

Craig H.
pelvis wrote on 10/14/2001, 8:40 PM
The recompression switch mentioned in the manual is an error.
jboy wrote on 10/15/2001, 1:56 PM
FYI everybody, there are versions of the MS-DX8 codec that dont degrade the image. I use the Mainconcept codec so dont have to worry about it in any case, but for those wishing to replace the flawed QDV.dll file with the correct one, head on over to the Pinnacle Studio DV support forum at www.pinnaclesys.com and search for the thread on this matter, you'll be glad you did.
HPV wrote on 10/15/2001, 2:54 PM
>>but for those wishing to replace the flawed QDV.dll file with the correct one, head on over to the Pinnacle Studio DV support forum at www.pinnaclesys.com and search for the thread on this matter, you'll be glad you did.
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Jboy, I went there and read most of the 225 post about QDV.dll
Everything was about dropped audio, capturing and such. Only thing talking about render quality was way back in 2000. The slight green tint I'm talking about is very minimal. Nothing like what I've read about the DX7 NTSC DV renders with horz. shift and major chroma shift.
I think that what I'm seeing is something few if any will notice. I can live with the quality I'm getting.
Sounds like Vegas 3 might have its own DV codec anyway.

Cheers,
Craig H.