Latest post Sun, Jan 18 2015 8:07 PM by Stu. 7 replies.
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  • Fri, Jan 16 2015 2:37 AM

    • Stu
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    DNxHR - no inbetween LB (low bandw) and SQ (standard bandw)?

    In the example of DNxHD with 1920x1080 at 23.976

     

    DNx36 = DNx LB (Low Bandwidth)

    DNx80 = not there

    DNx115 = DNx SQ (Standard Quality)

    DNx175 = DNx HQ (High Quality)

    DNx175X = DNx HQX (High Quality 10-bit)

     

    No biggie, standing by!

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  • Fri, Jan 16 2015 10:34 AM In reply to

    Re: DNxHR - no inbetween LB (low bandw) and SQ (standard bandw)?

    But isn't standard quality considered the lowest finishing quality. Low bandwidth for offline. So why have something inbetween?

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  • Fri, Jan 16 2015 11:34 AM In reply to

    Re: DNxHR - no inbetween LB (low bandw) and SQ (standard bandw)?

    We have had an in between one (80/100). It's right here for me in 7.0.4.2. I think the OP is not seeing it in 8.3.0?

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  • Fri, Jan 16 2015 12:15 PM In reply to

    Re: DNxHR - no inbetween LB (low bandw) and SQ (standard bandw)?

    Ah the topic threw me. We're not talking about DNxHR but DNxHD

     

    Just tested on my machine V8.3.0 on PC and I see DNxHD 80 at 1080 23.98

     


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  • Fri, Jan 16 2015 12:27 PM In reply to

    • Stu
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    Re: DNxHR - no inbetween LB (low bandw) and SQ (standard bandw)?

    Hi all. I am indeed talking about DNxHR. 

     

    I have all the traditional DNxHD flavors, but DNxHR is technically missing that 80/100 flavor. 

     

    Go to Avid Media Composer help, and search for "DNxHR family", you will see that the list I made in the first post lines up, even the bitrates are the same, with the exception of not being a 80/100 flavor. 

     

    Next time open up a 2k project, import multiple frame rate media, and do a consolidate/transcode, you will see that you can transcode without making new projects if you use DNxHR (with match source raster selected). 

     

    Hence why I would like to see DNxHR implement those inbetween bitrates before I completely transition to DNxHR in the future. 

     

    As for when you can QTref DNxHR, well that's a different story. 

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  • Fri, Jan 16 2015 12:55 PM In reply to

    Re: DNxHR - no inbetween LB (low bandw) and SQ (standard bandw)?

    But DNxHD80/100 is downsampled to 1440x1080 and that probably wouldn't make sense with DNxHR?

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  • Fri, Jan 16 2015 3:22 PM In reply to

    • ck123
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    Re: DNxHR - no inbetween LB (low bandw) and SQ (standard bandw)?

    Job ter Burg:

    But DNxHD is downsampled to 1440x1080 and that probably wouldn't make sense with DNxHR?

    What Job said. DNxHD100 codec family, which includes DNxHD 80, is thin raster.

    From the Avid white paper on DNxHD:

    "Avid DNxHD 100: For optimal visual impact where workflow speed and storage capacity are important factors. Suitable replacement for DV100 compression and offers lower processing overhead than AVC-Intra 50/100. Sub-samples the video raster from 1920 to 1440 or from 1280 to 960 to reduce compression artifacts, providing a balance of reduced compressed bandwidth and visual quality."

    All DNxHR codecs are meant for higher than HD resolution and are full raster. Hence no option in a 2k project for a thin raster bit rate. If you changed your project format to 1080 and set the raster to thin you should get the option for the DNxHD 80.

    I think the best way to look at is this. If there were a thin raster 2k, it's actual resolution would be 1536x1080. But that resolution is technically below full raster 1080. So, an full raster 1080 image would be higher resolution than a thin raster 2k image. For comparison, a thin raster 1080 image is higher resolution than a full raster 720 image, 1440x1080 vs 1280x960. From an engineering stand point a thin raster 2k format wouldn't make much sense.

     

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  • Sun, Jan 18 2015 8:07 PM In reply to

    • Stu
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    • Joined on Mon, Dec 6 2010
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    Re: DNxHR - no inbetween LB (low bandw) and SQ (standard bandw)?

    Thanks for the explination that makes perfect sense!!!  Good to know.  The only way to get lower bitrates is to go Long-GOP, but as we all know long-gop is annoying!

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