Chopping 52 min. documentary

[Shane Ross]

[Vasja Mihelcic] “When I finish editing, should I transcode DNxHD 120 to DNxHD 185 and than export it as Apple ProRes HQ?”

Yes. Because that’s more comparable. Might want to see about 185x, as that is a 10 bit codec, where just plain 185 is 8-bit. Handles color correction better as 10-bit vs 8-bit. So AMA link and transcode only the footage used in the sequence to 185x, and then color correct…then mix down and output.

[Vasja Mihelcic] “Is there a better codec for DSLR footage DNxHD?”

No, DNxHD is pretty good. It’s a common, high end finishing codec for broadcast. And since H.264 is 8-bit, anything like 1:1 or Uncompressed is pointless.

Shane
Little Frog Post
Read my blog, Little Frog in High Def

[Pat Horridge]

Don’t transcode dnx120 to dnx 185 its pointless.
Either AMA the h264 files and transcide to dnx185x (the 10 bit codec will improve grading precision)
Or AMA the h264. Transcode to dnx120 for offline. Relink final sequence to H264 sources then transcode to dnx185x.
Up rezing 120 to 185 just increases file size for no quality gain.

Pat Horridge
Broadcast & Post Consultant, Trainer, Avid Certified Instructor
Free online Tutorials at VET digital media academy online https://vimeo.com/channels/752951
pat@vet.co.uk

[Vasja Mihelcic]

Dear Pat,

That is some serious “lab” work ahead of me.

Thx for the advice…I am not such a H.264 fan.

[Vasja Mihelcic]

Thank you very much for assisting me.

[Vasja Mihelcic]

Just quick reminder…When exporting I choose: same as source ProRes HQ. I mean video mixdown from dnx 185 to Prores HQ and then export as the delivery methode so I don’t have colore problem.

[Vasja Mihelcic]

Hay Pat and Shane

When I transcode the project from dnx 184 to ProRes HQ my bitrate is only 178 and not 184. If I export avid based file it is 184 Mbps. Information I get with InfoMedia. Am I making a mistake? The client demand ProRes HQ 1080, 25 fps 184 VBR
Can get the bitrate needed with ProRes HQ

Thanks for any info about that.

VM

[Pat Horridge]

Avid DNx codecs are fixed datarate so the actual datarate is what it is.
Prores however is a variable datarate so if the content isn’t demanding enough to use the full datarate the datarate is lowered. You can’t force Prores to use all the datarate. If you have Prores HQ then that’s what it is.

Pat Horridge
Broadcast & Post Consultant, Trainer, Avid Certified Instructor
Free online Tutorials at VET digital media academy online https://vimeo.com/channels/752951
pat@vet.co.uk

[Vasja Mihelcic]

Thank you Pat for your time.

I will do another export same as source and ProRes HQ to see the difference in bit rate. Did some additional correction and applied safe colour limiter. Now all the colours are in legal rights.

[Vasja Mihelcic]

I checked the video with pro media tool video analyzer. And I got errors regarding the video. Avid colour correction shows everything in legal rights. Broadcast safe 16-235. No blacks, whites, luma…issues. But in the analyser everything off the charts…
I exported same as source ProRes HQ 1080 25 fps 182 Bitrate.

Any idea?

[Pat Horridge]

Was the export set to full range levels or studio levels?
ProRes does odd things re levels….

Pat Horridge
Broadcast & Post Consultant, Trainer, Avid Certified Instructor
Free online Tutorials at VET digital media academy online https://vimeo.com/channels/752951
pat@vet.co.uk