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Demux/Remux DNxHD and ProRes 422 HQ?

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Michael Gibrall
Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 16, 2015 at 3:06:07 pm

I rendered a film using Sony Vegas Pro 12 in DNxHD. I also had the film rendered on a Mac with ProRes 422 HQ.

I need to replace the audio on these files.

Is there a way to demux and remux these files, or must I recomple them?

For now, I have rendered the fixed audio on uncompressed aiff and wav.

Thanks in advance.


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Wayne Waag
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 17, 2015 at 1:51:41 am

Since DNxHD is in an mov container (I think), you could try FFmpeg. I remux MP4 files with a new audio track all the time. If you're on a Windows machine, I'd stay away from ProRes that was encoded on a Mac, if at all possible.

wwaag


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Michael Gibrall
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 25, 2015 at 12:35:50 pm

Wayne, thank you. I successfully encoded using ffmpeg and made a new dnxhd file with the added audio file. It took me a little while to understand the command line commands, but it worked great!


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Wayne Waag
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 25, 2015 at 3:26:13 pm

[michael]
Glad it worked for you. It does take awhile at first, but it's a very powerful and useful bit of software to keep in your toolbox.

wwaag


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John Rofrano
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 18, 2015 at 2:49:36 pm

I believe you can replace the audio track using QuickTime 7 Pro. I also found this utility for Mac called QT Edit that can do this. I've never use this tool but the blog post in the link explains how.

~jr

http://www.johnrofrano.com
http://www.vasst.com



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Michael Gibrall
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 20, 2015 at 1:16:49 pm

Thank you both for the tips. I'll look into this later.

John, will I be able to use Quicktime Pro 7 to do the remux on a PC? Or would I be restricted to doing it on a Mac, since ProRes is Mac specific?

Thanks in advance.


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John Rofrano
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 20, 2015 at 1:39:47 pm

I haven't tried it but you should be able to use a PC even for ProRes because you are not encoding. You are just copying the video stream from one file to another adding a different audio stream. Muxing doesn't involve encoding so it should work. If not, then I guess you would need to do the ProRes remux on a Mac.

~jr

http://www.johnrofrano.com
http://www.vasst.com



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Michael Gibrall
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 20, 2015 at 5:53:28 pm

Thanks, John.

I am assuming I can use my aiff stereo file, 48khz 24 bit file just fine?


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John Rofrano
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 20, 2015 at 8:34:45 pm

[Michael Gibrall] "I am assuming I can use my aiff stereo file, 48khz 24 bit file just fine?"
AIFF is the native audio format on the Mac so yes, it's perfectly fine for use in QuickTime.

~jr

http://www.johnrofrano.com
http://www.vasst.com



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Michael Gibrall
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 27, 2015 at 7:03:25 pm

John,

I actually gave FFMPEG a try on my PC with the ProRes 422 HQ file, since I was able to demux and remux a DNxHD file successfully. (And free is hard to beat.)

I got it to work.

I have played the file back with a Quicktime Player on both a PC and a Mac without issue, had it imported into Sony Vegas Pro 12 on my PC without a hitch, had it accepted into Adobe CS4 on a MAC (it initially was shown with digital breakup for a split second as the file was first called up, then it went away. It played back normally in Adobe CS4 and I had no trouble jumping back and forth on the file, randomly playing it back on the timeline.)

When using FCP, here's what it did...

When I selected the file in Finder and said OPEN WITH FCP, it did just that, without a problem, and played back normally.

When I was in FCP and 'imported' the file, I got the following notice from FCP:

"The following media files are not optimized for Final Cut Pro.

It is highly recommended that you either recapture the media or use the Media Manager to create new copies of the files to improve their performance for multi-stream playback."

"The ProRes 422 directory and filename"

That being said, the file played back normally, and I was able to go anywhere I wanted to on the timeline without issue.

Should I worry, or is this just one of those "Hey, he didn't use FCP to compile this file" things?

Thanks in advance.


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John Rofrano
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 28, 2015 at 3:26:07 pm

[Michael Gibrall] "Should I worry, or is this just one of those "Hey, he didn't use FCP to compile this file" things?"
FFMpeg does not contain a "licensed" encoder for ProRes. It's a "hack" that was "illegally" created by reverse engineering the real encoder but the country that the developer lives in doesn't honor international patents so the author will never be prosecuted for it. It's up you as to whether you want to give your clients files that were created by an unlicensed encoder. The fact that Apple software flagged this file as not being ProRes compliant tells the whole story, i.e., it's not a "real" ProRes file and it has caused performance problems when working with them in a project.

Whether you worry about it or not is up to you. If you are giving this file to a post production house and they are going to charge you real money to re-encode it before they work with it... then I would worry. If you don't care that it's "fake" ProRes and no one you give it to cares either... then don't worry.

Personally, I would be embarrassed to give my clients files that were not encoded by a licensed encoder. Your mileage may vary. ;-)

~jr

http://www.johnrofrano.com
http://www.vasst.com



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Michael Gibrall
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 29, 2015 at 2:46:37 pm

Thanks, John. Lots of things to consider.


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Michael Gibrall
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 29, 2015 at 3:25:10 pm

John, I did the ffmpeg trial to see if I could demux and remux without spending any money.

But I'd have no problem spending the $30 to purchase Quicktime Pro.

If I demux and remux with Quicktime Pro, I'm assuming I won't get that prompt again in FCP?


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Wayne Waag
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 29, 2015 at 4:27:59 pm

[Michael]

Here's a thread you might be interested in reading. Tells how to do it in QT Pro.

https://forums.creativecow.net/thread/8/1088501

Since I have QT Pro, I tried it with some ProRes 422 footage produced by Mercalli and it does work, although it is very slow, like one poster mentioned. It seems to be simply re-rendering and the resulting file is no longer ProRes according to MediaInfo. Maybe, I did it wrong. Of some interest, according to MediaInfo, the writing library for the ProRes file produced by Mercalli is "fmpg" which I would guess is FFmpeg. After all, you're not doing a ProRes render, but simply changing the audio track.

wwaag


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Michael Gibrall
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 29, 2015 at 6:19:57 pm

Yeah, I don't want to re-render. I can't have that.
Shucks.


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Michael Gibrall
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 31, 2015 at 2:14:04 am
Last Edited By Michael Gibrall on Jul 31, 2015 at 2:14:43 am

John:

I went ahead and spent the $30 to purchase Quicktime Pro 7 on my PC.

I demuxed and remixed the ProRes 422 HQ file and it worked. It did not recompress (couldn't, anyway, since ProRes is Mac native) and it was a straight copy of the given audio and video streams. Sony Vegas Pro 12 and Quicktime Pro 7 both state the video file is ProRes 422 HQ and the file size is the same.

So for your future reference, Quicktime Pro 7 on a PC will demux/remux a ProRes 422 HQ file on a PC.


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John Rofrano
Re: Demux/Remux DNxHD and ProRes 422 HQ?
on Jul 31, 2015 at 7:40:54 pm

[Michael Gibrall] "So for your future reference, Quicktime Pro 7 on a PC will demux/remux a ProRes 422 HQ file on a PC."
Awesome! Thanks for getting back to us with the results. Hopefully this will help someone else in the future.

~jr

http://www.johnrofrano.com
http://www.vasst.com



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