la version 6.5 fait-elle vraiment du 10 bits?

zebra33 · Dec 18, 2012

Me voila dans une situation très embarrassante.

Je travail sur un projet tourné en Prores 4.2.2 10bit, j'ai fait le montage depuis des fichiers en DNxHD 36.
J'ai relinké sans soucis le projet avec les fichiers natif, puis envoyé le film sous deux versions pour étalonnage.
1) un mixdown en 1:1 10b
2) un fichier AAF en 10 bits.

Le problème est que, ces deux versions sont parfaitement reconnues par le NUCODA mais elles seraient en 8bits. On me donne comme explication, que ce serait la dernière version de MC, la 6.5, qui ne gérerai plus les exports en 10 bits.

Quelqu'un a-t-il eu la même expérience, et comment faire?

STEF · Dec 18, 2012

De avid :

Avid will only generate TRUE 10 bit media from "Fast Imported" (natively supported) or AMA+Consolidated media like DNxHD or TIFF 16 bit images. All other codecs, including 10 bit QT codec like Blackmagic are placed in a 10 bit container but has only 8 bit utilized. For PC this applies to ProRes also since there is no native support for this codec in this platform.

Basically, he is wrong. DNXHD 10 bit is imported as 10 bit assuming it "Fast Imported" or AMA+Consolidated. Keep in mind, you can import DNXHD that will not fast import thus will go through re-encoding, thus will be mapped 8 bit in a 10 bit container (this means in your bin it will say DNX220x but will actually contain only 8 bit data).

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Questions:

1-Do forced custom exports in the DnxHD X codecs functionally match same as source exports from Composer resulting in true 10bit material inside the 10bit container?

(An example being having to export video from an AVC-INTRA 100 or mixed 10 bit resolution timelines. In many cases we have found even pure DnxHD timelines must be rendered forced custom for compatibility with 3rd party applications. )

2-Why are quicktime based applications not able to render out to DnxHD X codecs in 10bit? Is this a limitation Avid is aware of? Are there high priority plans to fix it or a suggested work around?

3-What is the suggested workflow to get 10 bit animations from graphic applications to Composer/Symphony?

4-What is the effective bit depth of ProRes 10 bit quicktime sources from cameras such as Alexa or out board recorders when linked via AMA? Any different with movies in the Black Magic 10bit codecs? Cineform?

5-Any difference with AVC-INTRA 100 files linked via AMA from P2 card structures? Red R3D? This is important to our workflow.

6-If AMA material such as AVC INTRA or ProRes is linked as 10bit, what occurs to bit depth when these files are transcoded to DnxHD X resolutions within Composer?

7-Is it true that Composer cannot import any 10bit material via traditional import other than 10bit Avid Codecs and Tiffs? Is this something that could be addressed in a future release or is it too embedded in Composer's architecture to effectively improve?

8-Anything different regarding the above in uncompressed HD or SD 10bit?

9-Anything different regarding the above when alpha is involved?

Answers:

1. Import and Export through Custom QuickTime are all 8 bit. They are not 10 bit no matter which codec is used.

2. To get 10 bit out or into MC you either need to do a SAS export or Fast Import of a 10 bit supported codec like Packed or DNxHD or AVCIntra. You can also get 10 bit import through photoshop files or TIFF. Also, AMA QuickTime will support 10 bit input of any 10 bit source video using v210 in YCbCr or RGB 16 bit per component in an RGB project

3. After Effects does support 10 bit output to the DNxHD or Packed codecs. The application does need to support 16 bit per component RGB which I believe AE supports.

4. See answer to 3.

5. ProRes444 is 10 bit. ProRes 422 can be 10 bit or 8 bit but it depends on what is stored in the movie so those files should come in as 10 bit with AMA

6. 10 bits should make it all the way to the 10 bit target resolution

7. Yes, see answer to 1. Yes, we can change this. Currently on the backlog, but not for the upcoming Murrow release.

8. References to "Packed" above are uncompressed HD and SD 10 bit

9. Alpha is only supported with fast import of DNxHD.

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SteF

Ateliers et Formations

la version 6.5 fait-elle vraiment du 10 bits?

zebra33

STEF

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