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Converting DNxHD to ProRes

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Nick Meyers
Converting DNxHD to ProRes
on Feb 6, 2013 at 3:27:25 am

Hi everyone.

i am taking over a feature that has been cutting in Avid.

turns out the Avid project is using media that was synced during transcode.
so, on transcode from Prores 4444 to DNxHD, any audio with matching TC was found, and married; as in baked in with the picture.

what this means is that the number of audio tracks varies from file to file, depending on the original audio source.
so the simplest approach for me is to get a ProRes copy of those files WITH the corresponding number of audio tracks.

what would be the best tool to do this conversion?

Compressor, of course has the "Audio Pass-Through" option,
which is good, BUT i have found compressor tends to fall over on really big jobs,
and not so big jobs, too: i would be wary of a job with more than 10 files, (based on my experience)

i have already been through the "why don't you work in Avid" debate.
It is not entirely out of the question, but unlikely,
and i don't want to paint myself into a corner there, so trasncoding will start ASAP.

the bigger topic of how it will all happen is of interest, but not really what i'm asking about right now


thanks for any advice,
nick


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Ryan Holmes
Re: Converting DNxHD to ProRes
on Feb 6, 2013 at 3:23:13 pm

Why can't you just edit the already transcoded DNxHD .mov files in FCP? Why transcode to ProRes?

FCP7 will handle DNxHD fine, provided you've downloaded and installed the codecs from Avid.

Ryan Holmes
http://www.ryanholmes.me
vimeo.com/ryanholmes


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Nick Meyers
Re: Converting DNxHD to ProRes
on Feb 6, 2013 at 7:00:37 pm

thanks, Ryan.

good question.

the first test sequence i brought in plays fine
how stable would it be over a large project do you think?

it's a low-budget feature w 25 days of shooting.


nick


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Ryan Holmes
Re: Converting DNxHD to ProRes
on Feb 6, 2013 at 7:16:24 pm

Should be fine. FCP7 plays well with many different codecs. For sure it plays best with ProRes, but if you're talking about transcoding 25 days worth of footage that's a pretty good chuck of time wrapped up in transcoding. An investment I wouldn't want to make...but that's just me.

DNxHD should be no problem in FCP7 provided your sequence settings match your footage correctly.

Ryan Holmes
http://www.ryanholmes.me
vimeo.com/ryanholmes


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Andrew Kimery
Re: Converting DNxHD to ProRes
on Feb 6, 2013 at 9:56:00 pm

DNxHD is not a codec supported by FCP's RT Extreme engine though which means any change to the footage outside of a straight cut will result in a red render bar.




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Nick Meyers
Re: Converting DNxHD to ProRes
on Feb 6, 2013 at 11:54:55 pm

a few days of transcoding is worth a stable and workable project. (edit will go for around 8 weeks)

aiso, i can start working with the re-wrapped DNxHD, and transcode on another machine in the background, so no real worries.

turns out the audio track issue is a non-issue, as they are NOT married in with the picture files, i was mistaken there (had not seen the media at that stage)

also turns out they transcoded with a 2.35 mask, i prefer to ad that myself (allows for re-framing etc)

i may now be thinking of transcoding the original 4444 to LT.
Resolve will do this nicely.



thanks for the thoughts,
nick


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Nick Meyers
Re: Converting DNxHD to ProRes
on Feb 10, 2013 at 7:26:44 am

kicked off the re-transcode in Resolve early this afternoon.
10 days of rushes on one system
10 days on another,
and 5 on a third.

should be ready tomorrow morning
compressor could never do that

resolve also opens the MXF files, so is probably the answer to the original question.


nick


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